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    • Posted by Pallavi Chaudhary 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Sarthak Dhawley 5 years, 2 months ago

    No only strong acid are toxic normal acids like lemon are not toxic

    1Thank You

    Kaushal Kashyap 5 years, 2 months ago

    No all acids are no toxic only strong acid are toxic

    1Thank You

    Omm Prasad Sahoo ??? 5 years, 2 months ago

     The international transport pictogram for corrosives. EtymologyEdit The word corrosive is derived from the Latin verb corrodere, which means to gnaw, indicating how these substances seem to "gnaw" their way through flesh or other materials. Chemical termsEdit The word corrosive refers to any chemical that will dissolve the structure of an object. They can be acids, oxidizers, or bases. When they come in contact with a surface, the surface deteriorates. The deterioration can happen in minutes, e.g. concentrated hydrochloric acid spilled on skin; or slowly over days or years, e.g. the rusting of iron in a bridge. Sometimes the word caustic is used as a synonym for corrosive when referring to the effect on living tissues. At low concentrations, a corrosive substance is called an irritant, and its effect on living tissue is called irritation. At high concentrations, a corrosive substance causes a chemical burn, a distinct type of tissue damage. Corrosives are different from poisons in that corrosives are immediately dangerous to the tissues they contact, whereas poisons may have systemic toxic effects that require time to become evident. Colloquially, corrosives may be called poisons but the concepts are technically distinct. However, there is nothing which precludes a corrosive from being a poison; there are substances that are both corrosives and poisons. Corrosion of non-living surfaces such as metals is a distinct process. For example, a water-air electrochemical cell corrodes iron to rust, corrodes copper to patina, and corrodes copper, silver, and other metals to tarnish. In the international system of symbolic chemical labels, both rapid corrosion of metals and chemical corrosion of skin qualify for the corrosive symbol. Effects on living tissue Common types Personal protective equipment Uses References

    1Thank You

    Vanshika Upmanyu 5 years, 2 months ago

    Not all

    0Thank You

    Aariz Shaikh 5 years, 2 months ago

     The international transport pictogram for corrosives. EtymologyEdit The word corrosive is derived from the Latin verb corrodere, which means to gnaw, indicating how these substances seem to "gnaw" their way through flesh or other materials. Chemical termsEdit The word corrosive refers to any chemical that will dissolve the structure of an object. They can be acids, oxidizers, or bases. When they come in contact with a surface, the surface deteriorates. The deterioration can happen in minutes, e.g. concentrated hydrochloric acid spilled on skin; or slowly over days or years, e.g. the rusting of iron in a bridge. Sometimes the word caustic is used as a synonym for corrosive when referring to the effect on living tissues. At low concentrations, a corrosive substance is called an irritant, and its effect on living tissue is called irritation. At high concentrations, a corrosive substance causes a chemical burn, a distinct type of tissue damage. Corrosives are different from poisons in that corrosives are immediately dangerous to the tissues they contact, whereas poisons may have systemic toxic effects that require time to become evident. Colloquially, corrosives may be called poisons but the concepts are technically distinct. However, there is nothing which precludes a corrosive from being a poison; there are substances that are both corrosives and poisons. Corrosion of non-living surfaces such as metals is a distinct process. For example, a water-air electrochemical cell corrodes iron to rust, corrodes copper to patina, and corrodes copper, silver, and other metals to tarnish. In the international system of symbolic chemical labels, both rapid corrosion of metals and chemical corrosion of skin qualify for the corrosive symbol. Effects on living tissue Common types Personal protective equipment Uses References

    1Thank You

    ANSWER

    • Posted by Kaira Shinde 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Yangzee Sherpa 5 years, 2 months ago

    The Adaptations Of Polar Bear To Live In Polar Regions Are As Follows: i)The layer of fat under the skin for insulation. ii)Long curved and sharp claws to walk and run on slippery ice. iii)Thick white fur. White colour protects it from predators and thick layer keeps it warm. HoPe It HeLpS yOu??

    1Thank You

    Juned Mudhol 5 years, 2 months ago

    Ko

    1Thank You

    Omm Prasad Sahoo ??? 5 years, 2 months ago

    To live in an extremely cold climate, the polar bear has many adaptations, such as: (a) The layer of fat under the skin for insulation. (b) Long curved and sharp claws to walk and run on slippery ice. (c) Thick white fur. White colour protects it from predators and thick layer keep it warm. (d) Other features are rounded body, small ears and a strong sense of smell.

    1Thank You

    Gaurav Seth 5 years, 2 months ago

    To live in an extremely cold climate, the polar bear has many adaptations, such as:

    (a) The layer of fat under the skin for insulation.

    (b) Long curved and sharp claws to walk and run on slippery ice.

    (c) Thick white fur. White colour protects it from predators and thick layer keep it warm.

    (d) Other features are rounded body, small ears and a strong sense of smell.

    1Thank You

    ANSWER

    • Posted by Pranay Pandey 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Omm Prasad Sahoo ??? 5 years, 2 months ago

    A vertical section (or cutting) through the soil showing the different layers of soil is called soil profile. Soil profile consists of three different layers of soil. Horizon Each layer of soil is called a horizon. The three lavers of soil in the soil profile are: 1) A-horizon (or Top-soil) 2)B-horizon (or Sub-soil) 3)C-horizon (or Sub-stratum) A- horizon- * This is the topmost horizon and also called as topsoil. * Contains large amount of humus and minerals. * Topsoil is soft and porous. * Capacity of water retention of this soil is more. * Hold the roots of the plants entirely. * House of many living organisms such as worms, rodents, moles and beetles.      2)   B-horizon-            * Second layer of soil profile and also called as middle layer.            * Contains larger amount of minerals than humus.            * More compact and harder than topsoil.     3)    C-horizon-            * Third layer of soil profile.            * Small lumps of rocks are found with cracks and cervices.    4)     Bedrock-            * The last layer of soil profile.            * Very hard.            * This layer is even difficult to dig with a spade .

    0Thank You

    Gaurav Seth 5 years, 2 months ago

    A vertical section (or cutting) through the soil showing the different layers of soil is called soil profile. Soil profile consists of three different layers of soil.

    Horizon

    Each layer of soil is called a horizon. The three lavers of soil in the soil profile are:

    1) A-horizon (or Top-soil)

    2)B-horizon (or Sub-soil)

    3)C-horizon (or Sub-stratum)

    • A- horizon-

    * This is the topmost horizon and also called as topsoil.

    * Contains large amount of humus and minerals.

    * Topsoil is soft and porous.

    * Capacity of water retention of this soil is more.

    * Hold the roots of the plants entirely.

    * House of many living organisms such as worms, rodents, moles and beetles.

         2)   B-horizon-

               * Second layer of soil profile and also called as middle layer.

               * Contains larger amount of minerals than humus.

               * More compact and harder than topsoil.

        3)    C-horizon-

               * Third layer of soil profile.

               * Small lumps of rocks are found with cracks and cervices.

       4)     Bedrock-

               * The last layer of soil profile.

               * Very hard.

               * This layer is even difficult to dig with a spade .

    0Thank You

    ANSWER
    2. Nitrogen Fixation Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram. etc. do not apply nitrogenous fertilizers during cultivation. Infact swollen structures can be seen in their roots. The legume looks healthy in presence of these structures and shows no symptoms of any disease. The soil too gets enriched after legume cultivation. Q1. What must be these swollen structures? Q2. There is no need to apply urea on legumes.(Agree/Disagree) Q3. Comment on how these structures/organisms might be helpful to the legumes. i . Colonies of Rhizobia fix nitrogen into nitrates. (YES/NO) ii. Colonies of Rhizobia fix nitrates into ammonia.(YES/NO) iii. Colonies of Rhizobia make food for the legumes.(YES/NO) iv. Colonies of Rhizobia make water available for legumes to photosynthesise. (Y ES/NO) Q4. Do you think such relationships are successful? (YES/NO)

    • Posted by Saurav Das 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Krunal Patel 5 years, 2 months ago

    What?

    0Thank You

    ANSWER
    Nitrogen Fixation Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram. etc. do not apply nitrogenous fertilizers during cultivation. Infact swollen structures can be seen in their roots. The legume looks healthy in presence of these structures and shows no symptoms of any disease. The soil too gets enriched after legume cultivation. QI . What must be these swollen structures? Q2. There is no need to apply urea on legumes.(Agree/Disagree) Q3. Comment on how these structures/organisms might be helpful to the legumes. i . Colonies of Rhizobia fix nitrogen into nitrates. (YES/NO) ii. Colonies of Rhizobia fix nitrates into ammonia.(YES/NO) iii. Colonies of Rhizobia make food for the legumes.(YES/NO) iv. Colonies of Rhizobia make water available for legumes to photosynthesise. (Y ES/NO) Q4. Do you think such relationships are successful? (YES/NO)

    • Posted by Saurav Das 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 0 answers
    ANSWER

    • Posted by Parvesh Phogat 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Kaira Shinde 5 years, 2 months ago

    • the chemical change also called chemical reaction • A chemical cause a substance to change into an entirely substance with a new chemical formula • A chemical change is a permanent change • chemical change is irreversible

    1Thank You

    Yogita Ingle 5 years, 2 months ago

    •  A chemical change produces a new substance.
    • The changes are permanent and mostly irreversible.
    • Also, it involves absorption or release of energy in the form of heat or light.

    2Thank You

    ANSWER

    • Posted by Rahul Yadav 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Somya Verma 5 years, 2 months ago

    Newer alluvium

    0Thank You

    Yogita Ingle 5 years, 2 months ago

    Newer alluvium is called khadar. It contains new alluvium. Used extensively for agriculture. It has no calcareous deposits.

    0Thank You

    ANSWER

    • Posted by Pramod Vemula 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 5 years, 2 months ago

    Adaptation is the physical or behavioural characteristic of an organism that helps an organism to survive better in the surrounding environment.

    Living things are adapted to the habitat they live in. This is because they have special features that help them to survive. 

    0Thank You

    ANSWER

    • Posted by Taniksha Sharma 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 5 years, 2 months ago

     Prevention of soil pollution can be done by
    (i) use of manures instead of synthetic fertilisers.
    (ii) use of natural pesticides.
    (iii) avoid dumping of polythene and plastics in soil.
    (iv) industrial waste should be treated before release in soil.


    Prevention of soil erosion can be done by
    (i) afforestation that is large scale planting in place of cut down forests.
    (ii) avoiding overgrazing of grasslands.
    (iii) terrace farming and other better farming methods in hilly areas.

    1Thank You

    ANSWER

    • Posted by Vaanavee Ramesh 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Rachna Bhagat 5 years, 2 months ago

    1.Who eats vegetables,fruits, Pulses, Wheat =Vegetarian 2.Who eats vegetables,fruits, Pulses,Wheat,Egg=Eggiterian 3.Who eats vegetables,fruits, Pulses,Wheat,Egg,Meat=Non vegetarian

    1Thank You

    Taniksha Sharma 5 years, 2 months ago

    Egg is divided into 3 parts the shell, the yellowish part and the white part is veg because it was not related to the animal's part

    1Thank You

    Vaanavee Ramesh 5 years, 2 months ago

    Thank u so much gianna

    0Thank You

    Gianna Ann Mathews 5 years, 2 months ago

    Well, the answer according to scientists is that eggs are very much vegetarian. Many people have reasoned that eggs are non-vegetarian since they come from a hen – a living thing.

    1Thank You

    ANSWER

    • Posted by Suihiamliu Kamei 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Kaushal Kashyap 5 years, 2 months ago

    Loamy soil

    0Thank You

    Gianna Ann Mathews 5 years, 2 months ago

    sandy loam

    0Thank You

    ANSWER

    • Posted by Suihiamliu Kamei 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Gianna Ann Mathews 5 years, 2 months ago

    Sandy Soil is light, warm, dry and tend to be acidic and low in nutrients. Sandy soils are often known as light soils due to their high proportion of sand and little clay (clay weighs more than sand).

    0Thank You

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    • Posted by Suihiamliu Kamei 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Gianna Ann Mathews 5 years, 2 months ago

    Different layers of soil are called soil horizons and the cross sectional arrangement of these layers in soil is called soil profile. a)Top soil b)Sub soil c)Parent rock d)Bed rock

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    • Posted by Suihiamliu Kamei 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Khushant ????? 5 years, 2 months ago

    Nn

    0Thank You

    Gianna Ann Mathews 5 years, 2 months ago

    Earthworms

    0Thank You

    ANSWER

    • Posted by Suihiamliu Kamei 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Gianna Ann Mathews 5 years, 2 months ago

    the upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles.Soil functions are general capabilities of soils that are important for various agricultural, environmental, nature protection, landscape architecture and urban applications.

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    • Posted by Anandee Bongoni 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Gianna Ann Mathews 5 years, 2 months ago

    A tooth consists of enamel, dentin, cementum and pulp tissue. The portion of a tooth exposed to the oral cavity is known as the dental crown, and the portion below the dental crown is known as the tooth root.

    1Thank You

    Jagdish Mahakud 5 years, 2 months ago

    There are four types of teeth first is incisor teeth, canine teeth, molar teeth and premolar teeth

    0Thank You

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    • Posted by Uzair Akhtar 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Gianna Ann Mathews 5 years, 2 months ago

    the process of turning from liquid into vapour.

    0Thank You

    Yogita Ingle 5 years, 2 months ago

    Evaporation can generally be defined as a process by which a liquid or solid is transformed into vapour.

    Evaporation causes cooling naturally. The underlying principle behind this is, in order to change its state, the matter must either gain or lose energy. In the case of change of phase from liquid to gas, molecules of matter require energy to overcome their potential energy by their kinetic energy. So, the liquid takes this energy from its surroundings.

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    • Posted by Sana Ahmad 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Esha Maurya 5 years, 2 months ago

    Crows are omnivorous because they eat small insects, lizards,worms.And on another side they eat berris and many fruits.

    1Thank You

    Rachna Bhagat 5 years, 2 months ago

    Because crow eats both plants and animals.

    1Thank You

    Priyanka Talikoti 5 years, 2 months ago

    Because crow will eats both plants and animals

    1Thank You

    Santosh Yadav 5 years, 2 months ago

    What is naali

    1Thank You

    Ujjawal Uniyal 5 years, 2 months ago

    Crow is known as omnivores because it eats both plants and animals

    0Thank You

    ANSWER

    • Posted by Anjali Mandlecha 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Gianna Ann Mathews 5 years, 2 months ago

    Warm water causes your fish to become more active and require more oxygen. Just one problem – warm water actually holds less oxygen than cooler water. In severe cases, there won't be enough oxygen to go around, and your fish can suffocate.

    0Thank You

    Amrutha B Goudar 5 years, 2 months ago

    Because oxygen decreases in warm water as the solubility of gases in water decreases as the temperature increases. So fish will die

    3Thank You

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    • Posted by Neet Kirar 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Anushka Kapoor 5 years, 2 months ago

    Wow what a answer

    1Thank You

    Gianna Ann Mathews 5 years, 2 months ago

    Acid and Bases:(i) acids are sour in taste.(i) bases are bitter in taste.

    2Thank You

    Yogita Ingle 5 years, 2 months ago

    Basis Acid Base
    Definition An acid is any chemical compound once dissolved in water produces a solution with hydrogen ion activity more than purified water A base is an aqueous substance that could absorb hydrogen ions.
    Strength Relies on the concentration of the hydronium ions Relies on the concentration of the hydroxide ions
    Examples Acetic acid CH3COOH and sulphuric acid Sodium Hydroxide (NaOH) and Ammonia
    Characteristics (Physical) Would depend upon the temperature acids would look solid, liquid or in the form of gas. It would also have a sour taste. Bases would feel slippery and solid in nature (except for ammonia, which is gaseous). It would have a bitter taste.
    Disassociation Acids would release hydrogen ions (h+) when mixed with water Bases would release hydroxide ions(OH-) when mixed with water

    2Thank You

    Neet Kirar 5 years, 2 months ago

    Answer: AcidsBases(i) Acids are sour in taste.(i) Bases are bitter in taste.(ii) It turns litmus paper red.(ii) It turns litmus paper blue.(iii) It doesn't change the colour of turmeric indicator.(iii) It changes the colour of turmeric indicator to red.(iv) It doesn't feel soapy on touching.(iv) It feels soapy on touching.

    1Thank You

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    • Posted by Manshi Yash Maurya 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Yogita Ingle 5 years, 2 months ago

    Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata. To understand how they function, study the following figures. As you look at the figures, keep in mind that an increase in solute concentration lowers the water potential of the solution, and that water moves from a region with higher water potential to a region of lower water potential.

    1Thank You

    Jainu Treesa Joseph 5 years, 2 months ago

    The cells tha are surrounded by stomata.

    1Thank You

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    • Posted by K Devapriya 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 5 years, 2 months ago

    The white reflects back most of the heat that falls on it, so, it is advisable that the outer walls of houses should be painted white in winters.

    1Thank You

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    • Posted by Lipsa Muduli 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Gianna Ann Mathews 5 years, 2 months ago

    Through the process of galvanization and painting. Galvanization means depositing a layer of zinc on iron.

    1Thank You

    Vanshika Upmanyu 5 years, 2 months ago

    By applying paint or zinc on it.

    1Thank You

    Lipsa Muduli 5 years, 2 months ago

    *Galvanisation- Method to protect still & iron articles from rusting by coating them with a layer of zinc. This process is called galvanisation. *Paintings also help iron from rusting

    1Thank You

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    • Posted by Sushma Shinde 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Gianna Ann Mathews 5 years, 2 months ago

    Carnivorous plants are plants that derive some or most of their nutrients from trapping and consuming animals or protozoans, typically insects and other arthropods. It is also called insectivorous plants. Venus fly trap and Pitcher Plant are some examples of carnivorous plants.

    1Thank You

    Amrutha B Goudar 5 years, 2 months ago

    Some plants eat insects. Such plants are called insectivorous plants. They trap and digest the insects. Pitcher plant is the example of an insectivorous plant.

    0Thank You

    B. Janani Sri 5 years, 2 months ago

    Insectivorous plants

    2Thank You

    Yogita Ingle 5 years, 2 months ago

    Some plants eat insects. Such plants are called insectivorous plants. They trap and digest the insects. Pitcher plant is the example of an insectivorous plant.

    1Thank You

    Somya Verma 5 years, 2 months ago

    Insectivorous

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    • Posted by Lipsa Muduli 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Kaushal Kashyap 5 years, 2 months ago

    A change no new substance are formed and it can easily reversed in original form

    0Thank You

    Gianna Ann Mathews 5 years, 2 months ago

    The change that effect only the physical properties of a substance is called physical change. They are mostly reversible and no new substances are formed in this process.

    0Thank You

    Hrishikesh Gogoi 7A 5 years, 2 months ago

    Physical change

    2Thank You

    Lipsa Muduli 5 years, 2 months ago

    Change that affect only physical properties of a substances & where no new substances are formed , are called physical change. They are mostly reversible

    4Thank You

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    • Posted by Nelson Dsouza 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Amrutha B Goudar 5 years, 2 months ago

    Distance=speed×time Short form D=s×t

    0Thank You

    Nelson Dsouza 5 years, 2 months ago

    Thank so much

    0Thank You

    Anshika Mathur 5 years, 2 months ago

    Distance= speed × time

    2Thank You

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    • Posted by Sujit Bhusari 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 5 years, 2 months ago

    Fleece and Wool bearing animals; like sheep, goat, camel, yak, etc. bear two types of hair – coarse hair and fine-soft under hair. Fine soft hair is found close to the skin in such animals. The fine soft under hair is called fleece. Fiber for wool is obtained from the fleece (hair) of such animals and hence such animals are called wool bearing animals.

    2Thank You

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    • Posted by Krishna Vaibhav Rai 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Nelson Dsouza 5 years, 2 months ago

    Rhizobium Bacteria grows in the Roots

    1Thank You

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    • Posted by Eknoor Singh 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Rachna Bhagat 5 years, 2 months ago

    This diagram is already in ours book.

    0Thank You

    ANSWER

    • Posted by Hardik Itiwad 5 years, 2 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Krishna Vaibhav Rai 5 years, 2 months ago

    Simple answer is that they derive their food feom dead and decaying organic matter

    1Thank You

    Eknoor Singh 5 years, 2 months ago

    A saprophyte is a plant that does not have chlorophyll, obtaining its food from dead matter, similar to bacteria and fungi. ... Plants such as these use enzymes to convert organic food materials into simpler forms from which they can absorb nutrients. Most saprophytes do not directly digest dead matter

    1Thank You

    Sumera Anjum 5 years, 2 months ago

    A saprophyte is a plant that does not have chlorophyll, obtaining its food from dead matter, similar to bacteria and fungi. ... Plants such as these use enzymes to convert organic food materials into simpler forms from which they can absorb nutrients. Most saprophytes do not directly digest dead matter

    1Thank You

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