CBSE > Class 07 > Science | CBSE Board | Homework Help

A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction.

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How the silkworms are reared, briefly

Posted by Antara Rathod 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

Rearing of silkworms: A female silk moth lays hundreds of eggs at a time. The eggs are stored by the farmers at suitable temperature and humidity under hygienic conditions. When the eggs hatch, silkworms come out of the eggs. The silkworms are fed mulberry leaves. After 25-30 days, the silkworms stop eating and get ready to spin cocoons. The silkworms enclose themselves completely inside the silken cocoons in two or three days.

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what is dark reaction?

Posted by Shaily Prasad 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

Dark reaction is also called carbon-fixing reaction. It is a light-independent process in which sugar molecules are formed from the carbon dioxide and water molecules.

The dark reaction occurs in the stroma of the chloroplast, where they utilize the products of the light reaction.

Plants capture the carbon dioxide from the atmosphere through stomata and proceed to the Calvin cycle.

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What is the meaning of mucous

Posted by Radhika Singh 5 years, 3 months ago

CBSE > Class 07 > Science

2 answers

Radhika Singh 5 years, 3 months ago

Thanks

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Nikita And Pratik 5 years, 3 months ago

Mucous is the type of a liquid a d a layer in the stomach that protect the stomach from different acid .

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ch- 5 acids , bases and salts

Posted by Anshika Sood 5 years, 3 months ago

CBSE > Class 07 > Science

2 answers

Samiksha .Sambyal 5 years, 3 months ago

What do you want regarding chapter 5 ...Acids , Bases and salts

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Anshika Sood 5 years, 3 months ago

very short Quetions answers

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Name the substance which are mixed (allowed) with iron to make stainless steel .

Posted by Srikant Bag 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

Nickel and chromium mixed with iron to make stainless steel hi hope it helps you mate stay safe

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What is stomata?? How does it help in photosynthesis?

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

2 answers

Krishna Unnikrishnan 5 years, 3 months ago

The gas exchange that occurs when stomata are open facilitates photosynthesis. Photosynthesis is the process by which plants convert sunlight into usable energy. During photosynthesis, carbon dioxide is taken in from the atmosphere through the stomata and oxygen is released as a waste product.

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Kuruva K.Sri Harshitha 5 years, 3 months ago

In leaves have some pores the pores are stomata . The stomata helps in photo synthesis .the leaves takes co2 by stomato and the leaves release O2 by stomato when water is more the stomata release some water like this stomata is helps in photo synthesis

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How does parasitic plants get their food ??

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

5 answers

Meenu Kandari 5 years, 3 months ago

Parasitic plants mainly gain their food by using their roots to invade a host plant and steal the food that it produces.

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Krishna Unnikrishnan 5 years, 3 months ago

Parasitic plants mainly gain their food by using their roots to invade a host plant and steal the food that it produces.

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Kuruva K.Sri Harshitha 5 years, 3 months ago

Ex: cuscuta, insectivorous

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Kuruva K.Sri Harshitha 5 years, 3 months ago

Like this all parasitic plants get their food

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Kuruva K.Sri Harshitha 5 years, 3 months ago

Example: cuscuta is a plant .the cuscuta keep one target to reach one plant the plant is called host.the cuscuta speed on the tree and reach host . cuscuta eat food from host plant

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Why do pickles spoil in rainy season?? Type short answers

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

3 answers

Meenu Kandari 5 years, 3 months ago

The fungal spores are generally present in the air and grow on article (e.g. pickles, leather shoes, clothes, etc.) that are left in hot and humid weather for a long time. During rainy season, they land on wet and warm things and begin to germinate and grow.

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Navdeep Rai 5 years, 3 months ago

Science Ch 4

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Krishna Unnikrishnan 5 years, 3 months ago

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What is pseudopodia describe it briefly....

Posted by Anamica Sancho 5 years, 3 months ago

CBSE > Class 07 > Science

2 answers

Anamica Sancho 5 years, 3 months ago

Thank you very much

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Krishna Unnikrishnan 5 years, 3 months ago

A pseudopod or pseudopodium (plural: pseudopods or pseudopodia) is a temporary arm-like projection of a eukaryotic cell membrane that are developed in the direction of movement. ... Pseudopods are used for motility and ingestion.

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Describe the process by which housefly derives its nutrition?

Posted by Shivam Singh 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Krishna Unnikrishnan 5 years, 3 months ago

A housefly uses its proboscis to eat a piece of sugar. Since the housefly's mouth parts are designed to sponge and ingest liquefied food, it's just a matter of turning on the suction. ... The food goes straight into the fly's stomach.

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Describe the process of by which ruminating animals break the cellulose during digestion ?

Posted by Shivam Singh 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Krishna Unnikrishnan 5 years, 3 months ago

Cud-chewing is an adaptation that enables many hoofed mammals to break down the cellulose of plant cell walls into nutrients that they can use and absorb.

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How would you show that settling of curd is a chemical change

Posted by Sakshi Kumari 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Krishna Unnikrishnan 5 years, 3 months ago

Setting of a curd is a chemical change because curd cannot be converted into milk again. Moreover, a new substance, curd is formed which is completely different in taste and properties from the milk.

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When plants or trees release co2

Posted by Shreya Yadav 5 years, 3 months ago

CBSE > Class 07 > Science

5 answers

Krishna Unnikrishnan 5 years, 3 months ago

As plants and trees grow, they take carbon dioxide from the atmosphere and turn it into sugars through photosynthesis. In this way, U.S. forests absorb 13 percent of the nation's carbon emissions; globally, forests store almost a third of the world's emissions.

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Kuruva K.Sri Harshitha 5 years, 3 months ago

During photo synthesis tree release oxygen The formula is :co2+water sunlight/chlorophyll + corbohydrate+oxygen Tree release co2 in night

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Sakshi Kumari 5 years, 3 months ago

All plants release co2 at night but only peepal tree release oxygen

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Ashutosh Pandey Pandey 5 years, 3 months ago

In night

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Ujjawalsingh Singh 5 years, 3 months ago

Tree release CO2 during photosynthesis

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One litre of water at 30 ° C is mixed with 50 ° C . The temperature of the mixture will be

Posted by Sandra Manoj 5 years, 3 months ago

CBSE > Class 07 > Science

4 answers

Krishna Unnikrishnan 5 years, 3 months ago

The mixture will have temperature in between 30oC and 50oC since the hot water (at 50oC) will try to lose its heat to the cold water (at 30oC).

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Hindu ?? 5 years, 3 months ago

The mixture will have temperature of water between 30°c and 50°c

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Ashutosh Pandey Pandey 5 years, 3 months ago

80 °C

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Ujjawalsingh Singh 5 years, 3 months ago

Wuwiuw

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ONLINE CLASS TEST 1 In a democracy why is universal adult franchise important. 2 state the two ways according to the article 15 which address inequality. 3 Why do you mean by midday meal scheme.

Posted by Jainind Verma 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Ujjawalsingh Singh 5 years, 3 months ago

a democracy every citizen is equal. The concept of Universal Adult Franchise is based on equality. Therefore, it is important in a democracy. Under Universal Adult Franchise every adult irrespective of caste, creed, religion, *** etc. has the right to vote.

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What is scientific name of lime water?

Posted by Suryakanta Mohanty 5 years, 3 months ago

CBSE > Class 07 > Science

4 answers

Krishna Unnikrishnan 5 years, 3 months ago

Calcium hydroxide (traditionally called slaked lime) is an inorganic compound with the chemical formula Ca(OH)2. ... Limewater is the common name for a saturated solution of calcium hydroxide.

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Ujjawalsingh Singh 5 years, 3 months ago

Calcium hydroxide, commonly referred to as slaked lime, is described by the chemical formula Ca(OH)2. It is an inorganic compound which has a white, powdery appearance in its solid-state. However, Ca(OH)2 has a colourless appearance in its crystalline form. The alternate names of this compound include hydrated lime, slack lime, pickling lime, and caustic lime. Generally, calcium hydroxide is prepared by mixing water and calcium oxide (also known as quick lime).

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Yogita Ingle 5 years, 3 months ago

Calcium hydroxide, commonly referred to as slaked lime, is described by the chemical formula Ca(OH)₂. It is an inorganic compound which has a white, powdery appearance in its solid-state. However, Ca(OH)₂ has a colourless appearance in its crystalline form.

The alternate names of this compound include hydrated lime, slack lime, pickling lime, and caustic lime. Generally, calcium hydroxide is prepared by mixing water and calcium oxide (also known as quick lime).

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Mayra Singh 5 years, 3 months ago

Slaked limes

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What are the NURTION and plants

Posted by Y . Sarandeep 10 5 years, 3 months ago

CBSE > Class 07 > Science

5 answers

Charitha Kn 5 years, 3 months ago

Nutrition is the mode of taking food by an organism and utilisation in our body

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Ashutosh Pandey Pandey 5 years, 3 months ago

Taking and utilising food is called nutrition and we can say that plants the God for us because of giving oxygen , food etc

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Ujjawalsingh Singh 5 years, 3 months ago

Nutrition can be defined as a process by which organisms take in the food utilize it in order to survive. Based on the mode of nutrition organisms can be divided into two categories Autotrophic Organisms- they can prepare their food by them selves such as plants They can prepare their food by themselves such as plants Heterotrophic Organisms - They depend upon other organisms for their food such as animals

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Mayra Singh 5 years, 3 months ago

The process of taking and utilising food by the organism is called nutrition. In a simple language plant is also called god as it provides oxygen which is very important for living beings and fruits, vegetables etc.

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Yogita Ingle 5 years, 3 months ago

Nutrition can be defined as a process by which organisms take in the food and utilize it in order to survive. Based on the mode of nutrition organisms can be divided into two categories:

Autotrophic Organisms - They can prepare their food by themselves such as plants
Heterotrophic Organisms - They depend upon other organisms for their food such as animals

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List any three changes in your surrounding that can be undone

Posted by Rakesh Sharma 5 years, 3 months ago

CBSE > Class 07 > Science

2 answers

Ujjawalsingh Singh 5 years, 3 months ago

Rusting of iron. (2) Growing of human beings. (3) Burning of woods.

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Hindu ?? 5 years, 3 months ago

(1) Rusting of iron. (2) Growing of human beings. (3) Burning of woods.

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Can all the change undone? Why?

Posted by Rakesh Sharma 5 years, 3 months ago

CBSE > Class 07 > Science

3 answers

Ujjawalsingh Singh 5 years, 3 months ago

Please explain the question properly I am unable to understand that about what change you are talking about

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Kuruva K.Sri Harshitha 5 years, 3 months ago

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Isha Gulati 5 years, 3 months ago

Please explain the question properly I am unable to understand that about what change you are talking about

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Science 1c first chapter of science notation in plants question answers with his chapter explanation science science's

Posted by Sdi Singh 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Ujjawalsingh Singh 5 years, 3 months ago

Aap khi bur

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Define the term autotroph?

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

5 answers

Kuruva K.Sri Harshitha 5 years, 3 months ago

Auto: self Hero:other

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Kuruva K.Sri Harshitha 5 years, 3 months ago

The organisims prepare there food there own is called autotrophic organisms or auto trops

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Mayra Singh 5 years, 3 months ago

The organism which makes their food by themselves are called autotrphs.ex-green plants

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Shreya Sinha 5 years, 3 months ago

This answer is right??

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Yogita Ingle 5 years, 3 months ago

Organisms which can make their own food from simple substances are called autotrophs.
They are producers.
For example, all green plants, cynobacteria, etc.

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Which chemical is used to find out the occurrence of photosynthesis???

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

3 answers

Krishna Unnikrishnan 5 years, 3 months ago

iodine is generally used to test the presence of chlorophyll .and where there is chlorophyll there is photosynthesis so it is iodine which is used to find out the accurence of photosynthesis

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Ashutosh Pandey Pandey 5 years, 3 months ago

Idoni

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Yogita Ingle 5 years, 3 months ago

Iodine is generally used to test the presence of chlorophyll .and where there is chlorophyll there is photosynthesis so it is iodine which is used to find out the accurence of photosynthesis

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Write the chemical equation of photosynthesis?

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

2 answers

Kuruva K.Sri Harshitha 5 years, 3 months ago

Glucose

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Yogita Ingle 5 years, 3 months ago

carbon dioxide + water → glucose + oxygen + wate
it can be written as
6CO₂ + 6H₂O → C₆H₁₂O₆+ 6O_2.

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What do you understand by the term host???

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

3 answers

Nikita And Pratik 5 years, 3 months ago

The plant on which a parasite climbs to derive its nutrition is called the host plant.

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Kuruva K.Sri Harshitha 5 years, 3 months ago

The plant like cuscuta this cuscuta plant keep to target to reach one plant that plant is called host.

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Yogita Ingle 5 years, 3 months ago

The plant on which a parasite climbs to derive its nutrition is called the host plant.

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Name to insectivorous plants?

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

3 answers

Shivam Singh 5 years, 3 months ago

Venus flytrap and rafflesia

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Yogita Ingle 5 years, 3 months ago

Insectivorous means insect-eating, these plants derive most of their nutrition from the insects, that they trap and consume. These plants grow in humid areas, where plenty of sunlight and moisture is found. They are found in the nitrogen deficient soil. That is why they trap and digest insects to absorb nutrients. Venus flytrap, pitcher plant and cobra lily are some of the insectivorous plants’ names. They are often called Carnivorous plants.

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Xxx Xxx 5 years, 3 months ago

1.pitcher plant 2.venus flytrap

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List the conditions necessary for photosynthesis?

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

Conditions necessary for photosynthesis are as follows,

Sunlight, the natural resource forms the basis for photosynthesis reaction.
The optimum humidity for photosynthesis to occur.
The availability of energy moiety like ATP (adenosine triphosphate) is very important and hence it is regulates the photosynthesis
The presence of chlorophyll and carbon dioxide is very important.

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What are the two components of lichen?

Posted by Shreya Sinha 5 years, 3 months ago

CBSE > Class 07 > Science

2 answers

Charitha Kn 5 years, 3 months ago

Alagae and fungus

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Bhoomi Rathi 5 years, 3 months ago

Algae and fungus

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How to cyclones formed

Posted by Faiz Khan 5 years, 3 months ago

CBSE > Class 07 > Science

2 answers

Yogita Ingle 5 years, 3 months ago

A Cyclone is a large scale air mass that rotates around strong centers of low pressure.

Water vapors are formed when water is heated.
This heat is released to atmosphere when water vapors convert to water during rains.
The heat released, warms the air around and makes it to move up. This also results in decreased air pressure.
Hence, cooler air from surrounding rushes to take the warm air’s place.
This repeats till a low pressure system with surrounding high speed winds is created. This is called a Cyclone.
Cyclone depends on wind speed, direction, temperature and humidity.

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Shreya Sinha 5 years, 3 months ago

To formed a cyclones,warm,moist air over the ocean rises upward from near the surface .

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