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    • Posted by Samraat Sahil Verma 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

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    • Posted by Arsh Bajwa 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

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    • Posted by Satyam Lodhi Rajput 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    TRYPSIN: Protein Digestion.It also activates other trypsinogen molecules, as well as other protein-digesting enzymes secreted as proenzymes with pancreatic juice. Therefore, trypsin is essential for normal function of digestive processes that convert food proteins into amino acids for absorption.

    LIPASE: Lipase is an enzyme that breaks down dietary fats into smaller molecules called fatty acids and glycerol. A small amount of lipase, called gastric lipase, is made by cells in your stomach. This enzyme specifically digests butter fat in your food.

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    • Posted by Goplani Aesha 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 3 answers

    Satyam Lodhi Rajput 5 years, 3 months ago

    Is 2

    0Thank You

    Aaditri Kumari 5 years, 3 months ago

    2.5 to 3.5

    0Thank You

    Shtri Sakti 5 years, 3 months ago

    The pH of gastric acid is 1.5 to 3.5 in the human stomach lumen

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    • Posted by Kanika .... 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Shtri Sakti 5 years, 3 months ago

    CBSE Class 10 Science Revision Notes CHAPTER – 15 OUR ENVIRONMENT Environment means everything which surrounds us. It may include living (biotic) and non-living (abiotic) components.Biotic : Plants and animals. Abiotic : Air, water etc.Environment affect the life and development of an organism in its natural habitat & vice a versa.Substances that can be decomposed by the action of micro-organism like bacteria are called bio-degredable. E.g. organic wastes.Substances which cannot be decomposed by the action of microorganisms are called non-biodegradable.Example of biodegradable wastes : cattle dung, cotton, jute, paper, fruit and vegetable peels, leaves etc.Examples of non-biodegradable wastes : plastics, polythene bags, synthetic fibres, metals, radioactive wastes. ECO SYSTEM & ITS COMPONENT All the interacting living organisms in an area together with non living components form an ecosystem. So an ecosystem consists of both biotic(living creatures) and abiotic components like temperature, rainfall, wind, soil etc. All living organisms are classified on the basis nutrition. I. Producers : All green plants, blue green algae can produce their food (Sugar & starch) from inorganic substance using light energy (Photosynthesis). II. Consumers : Include organisms which depend on the producers either directly or indirectly for their sustenance. Consumers depend on others for food.  III. Decomposeres : Fungi & Bacterias which break down(decompose) the dead plant, animals complex compounds into the simpler one. Thus decomposeres help in the replenishment   A 3- Step Food Chain Food Chain : It is the sequence of living organisms in which one organism consumes another organism for energy. It is unidirectional(single directional). In a food chain, various steps where transfer of energy takes place is called a trophic level.The green plants capture 1% of sun’s energy.The flow of energy is unidirectional in a food chain.There is gradual decrease in the amount of energy from one trophic level to next trophic level in a food chain. 10 Percent Law : The energy available at each successive trophic levelis 10% of the previous level. So only 10% of Energy is transferred to next trophic level while 90%of energy is used by present trophic level in its life processes. The concentration  of harmful chemical increases with every next trophic level in a food chain. It is called Bio-magnificationMaximum concentration of such chemicals get accumulated in human bodies. Since humans occupy the top level in any food chain. ENVIRONMENTAL PROBLEMS Changes in environment affect us and our activities change the environment around us. Environmental problems caused by humans: (a) depletion of the Ozone Layer and waste disposal. (b) pollution due to mismanagement of waste disposal. I. Depletion of Ozone Layer Ozone (O3) layer is largely found in the stratosphere which is a part ofour atmosphere from 12 km – 50km above sea level.Ozone is a deadly poison at the ground level.Ozone is formed as a result of a following photochemical reaction. Ozone layer is a protective blanket around earth which absorbs most of the harmful U.V. (Ultraviolet) radiation of the Sun, thus protecting the living beings of the earth from health hazards like skin cancer, cataract in eyes, weaken immune system, destruction of plants etc.The decline of Ozone layer thickness in Antartica was first observed in 1985 and was termed as OZONE HOLE. Reason of Ozone Depletion Excessive use of CFCs (Chloro Flouro Carbon) a synthetic, inert chemical E.g. Freon which are used as refrigerants and in fire extinguishers, caused Ozone depletion in the upper atmosphere. A single chlorine atom can destroys 1,00,000 Ozone molecules. U.N.E.P. (United Nation Environment Programme)did an excellent job in forging an agreement to freeze CFC production at 1986 levels (KYOTO Protocol) by all countries. Garbage Disposal Industrialization and rise in demand of consumer goods have created a major problem in the form of wastes/garbage accumulation and its disposal specially in urban area. The different methods of solid wastes disposal commonly used around the world are. 1. Open dumping : A conventional method in which solid wastes dumped in selected areas of a town. It actually cause pollution 2. Land fillings : Wastes are dumped in low living area and are compacted by rolling with bulldozers Composting : Organic wastes are filled into a compost pit (2m × 1m× 1m). It is then covered with a thin layer of soil. After about three months the same garbage filled inside the pit changes into organic manure. 4. Recycling : The solid wastes is broken down into its constituent simpler materials. These materials are then used to make new items. Even non-bio degradable solid wastes like plastic, metal can be recycled. 5 Reuse : A very simple conventional technique of using an item again& again. For e.g. paper can be reused for making envelops etc. What you have learnt The various components of an ecosystem are interdependent.The producers make the energy from sunlight available to the rest of the ecosystem.There is a loss of energy as we go from one trophic level to the next, this limits the number of trophic levels in a food-chain.Human activities have an impact on the environment.The use of chemicals like CFCs has endangered the ozone layer. Since the ozone layer protects against the ultraviolet radiation from the Sun, this could damage the environment.The waste we generate may be biodegradable or non-biodegradable.The disposal of the waste we generate is causing serious environmental problems.

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    • Posted by Dalbir Singh 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Śěřãj The Cute? 5 years, 3 months ago

    There has no sir and mam

    0Thank You

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    • Posted by Spider Man 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 4 answers

    Spider Man 5 years, 3 months ago

    Thank to all

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    1. The Human Eye It is a natural optical instrument which is used to see the objects by human beings. It is like a camera which has lens and screen system.

    (i) Retina : It is a light sensitive screen inside the eye on which image is formed. It contains rods and cones.

    (ii) Cornea : It is a thin membrane which covers the eye ball. It acts like a lens which refracts the light entering the eye.

    (iii) Aqueous humour : It is fluid which fills the space between cornea and eye lens.

    (iv) Eye lens : It is a Convex lens made of transparent and flexible jelly like material. Its curvature can be adjusted with the help of ciliary muscles.

    (v) Pupil : It is a hole in the middle of iris through which light enters the eye. It appears black because light falling on it goes into the eye and does not come back.

    (vi) Ciliary muscles : These are the muscles which are attached to eye lens and can modify the shape of eye lens which leads to the variation in focal lengths.

    (vii) Iris : It controls the amount of light entering the eye by changing the size of pupil.

    (viii) Optical nerve : These are the nerves which take the image to the brain in the form of electrical signals.

    2. Accomodation power : The ability of eye to change the focal length of eye lens with the help of ciliary muscles to get the clear view of nearby objects (about 25 cm) and far distant objects (at infinity).

    3. Colour blindness : Some people do not possess some cone cells that respond to certain specific colours due to genetic disorder.

    4. Myopia (Short sightedness) : It is a kind of defect in human eye due to which a person can see near objects clearly but he can not see the distant objects clearly. Myopia is due to

    (i) excessive curvature of cornea.
    (ii) elongation of eye ball.

    1Thank You

    Maahi ......♾ 5 years, 3 months ago

    Either, if you want so it is given in this app

    1Thank You

    Maahi ......♾ 5 years, 3 months ago

    May be this chapter is removed from the syllabus

    2Thank You

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    • Posted by Aakash Ramakrishnan 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 2 answers

    Sachin Ray 5 years, 3 months ago

    Contact me on watsapp I will explain you clearly

    0Thank You

    Kanika .... 5 years, 3 months ago

    The 2 plane mirrors are held at right angles, that is, they are inclined at an angle of 90 degrees. As we know that if 360/ 90 = 4 is a even no , the no of images is (360/90-1) = 3. In first two images the comb will be in his left hand, the image which is between those two images has the comb in his right hand.  Hence, the answer is 1.

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    • Posted by Maahi ......♾ 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 2 answers

    Yogita Ingle 5 years, 3 months ago

    • Platelets are a type of blood cells present in our blood.
    • Platelets contain fibrinogen protein which help in clotting of blood during a cut or injury.

    1Thank You

    Kajal Singh 5 years, 3 months ago

    A tiny, disc-shaped piece of cell that is found in the blood and spleenThey help form blood clots to slow or stop bleeding and to help wounds heal.

    1Thank You

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    • Posted by Anshuman Omm 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Riya Philip 5 years, 3 months ago

    Last year students..........LOL

    2Thank You

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    • Posted by Asmita Belapurkar 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 4 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

    0Thank You

    Ajay Tiwari 5 years, 3 months ago

    Functional groups

    0Thank You

    Ajay Tiwari 5 years, 3 months ago

    Homologous series

    0Thank You

    Ajay Tiwari 5 years, 3 months ago

    Unsaturated and saturated carbon compounds

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    • Posted by Versha Kawaliya 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 3 answers

    Kajal Singh 5 years, 3 months ago

    About 7.4

    1Thank You

    Saurabh ???? 5 years, 3 months ago

    7.40

    1Thank You

    Asmita Belapurkar 5 years, 3 months ago

    7.0-7.8

    1Thank You

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    • Posted by Siddhant Chauhan 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 0 answers
    ANSWER

    • Posted by Mukul Kumar 😎 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 5 answers

    Anshuman Omm 5 years, 3 months ago

    Nice

    0Thank You

    Tripura * 5 years, 3 months ago

    Thanks yarr for sharing it among us ???

    1Thank You

    Riya Philip 5 years, 3 months ago

    Thanks for sharing with us.

    1Thank You

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

    1Thank You

    Riya Philip 5 years, 3 months ago

    Oh my god .........the page is turning around ?

    1Thank You

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    • Posted by Sanika Walimbe 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 3 answers

    Dhanraj Sath 5 years, 3 months ago

    Kase karna hai join

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    The mucus is a substance secreted along the tube by cells lining its walls .Mucus helps food to slide through the canal without doing too much damage to the lining. It also forms a protective covering which keeps the digestive juices, which are inside the lumen of the canal, from coming into contact with the living cells of the walls. So the inner wall of alimentary canal is not digested.

    0Thank You

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

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    • Posted by Samruddhi Br 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ?

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    • Posted by Diya Arya 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

    0Thank You

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    • Posted by Ashtoush Mishra 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 2 answers

    Anshuman Omm 5 years, 3 months ago

    P=w/t ,(as w=vq) P=vq/t

    0Thank You

    Himanshi Soni 5 years, 3 months ago

    Nhi pra

    0Thank You

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    • Posted by Prachi Agrawal 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 5 answers

    Rudraksh Rai Udaiwal 5 years, 3 months ago

    Group of cells are termed as tissues

    0Thank You

    Sakshi Kori 5 years, 3 months ago

    Group of cells

    0Thank You

    Saurabh ???? 5 years, 3 months ago

    Group of cells join together to perform a specific function known as tissue

    0Thank You

    Rakshita Upadhyay 5 years, 3 months ago

    Tissue is a group of cell which have similar function

    0Thank You

    Ashtoush Mishra 5 years, 3 months ago

    A group of organized cell to perform a similar function

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    • Posted by Adhira Saha 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 0 answers
    ANSWER

    • Posted by A:) ‎ 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 4 answers

    Rudraksh Rai Udaiwal 5 years, 3 months ago

    No

    1Thank You

    Neetu Bansal 5 years, 3 months ago

    No it is not possible

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    The two magnetic field lines do not intersect each other because if they do it means at the point of intersecting the compass needle is showing two different directions which are not possible.

    1Thank You

    Beauty Singha 5 years, 3 months ago

    What us amoeba function

    1Thank You

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    • Posted by Chinmay Rathore 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 2 answers

    Màñój Bhöî 5 years, 3 months ago

    What is water crystalisation

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    Electric current is a scalar quantity. Any physical quantity is termed as a vector quantity when the quantity has magnitude and direction. But there are other factors that determine the quantity as vector or scalar quantity. If the physical quantity obeys the laws of vector addition such as triangle law of vector addition and parallelogram law of vector addition, then the quantity is said to be a vector quantity.

    In the case of electric current, when two currents meet at a junction, the resultant current of these will be an algebraic sum and not the vector sum. Therefore, an electric current is a scalar quantity although it possesses magnitude and direction.

    1Thank You

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    • Posted by Tiksha Gupta 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 2 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ?

    1Thank You

    Shivanshi Thakur 5 years, 3 months ago

    It's an process which helps the multicellular organisms to split or produce into such a way that the splitted parts which then grows and forms the further organism the happens generally with sea anemones

    5Thank You

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    • Posted by Tiksha Gupta 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 2 answers

    Yogita Ingle 5 years, 3 months ago

    Regeneration is the ability of an organism to grow into a complete individual when its body is divided into any number of pieces. It can be seen in Hydra and Planaria. 


    Regeneration is carried out by specialized cells which proliferate and further make large number of cells. From this mass of cells, different cells undergo changes to become various cell types and tissues. These changes take place in an organized sequence referred to as development.

    3Thank You

    Jagrati Sharma?? 5 years, 3 months ago

    When the simple animals like Hydra ,Planaria develop a new individual from their broken older part it is known as regeneration.

    3Thank You

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    • Posted by Tiksha Gupta 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 3 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

    0Thank You

    Tiksha Gupta 5 years, 3 months ago

    Thanks a lot, u did it for me

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    Yogita Ingle 5 years, 3 months ago

    Binary fission

    Multiple fission

    1. Forms two daughter individuals

    1. Forms many daughter individuals

    2. Divides only once

    2. Divides repeatedly

    3. No residue is left

    3. Residue is left

    4. Takes place in favourable conditions

    4. Takes place in favourable as well as unfavourable conditions

    5. Immortality is present

    5. Immortality is absent

    Example: Amoeba reproduces by binary fission

    Example: Plasmodium reproduces through multiple fission

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    • Posted by Tiksha Gupta 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    Variations are important as they ensure the survival of species over time and with the changing conditions. The niches and the environmental conditions change with time, the variations in the species helps them to adjust, adapt and survive the changes.

    2Thank You

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    • Posted by Ankush Verma 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 4 answers

    Sakshi Kori 5 years, 3 months ago

    It Breaks down fat into fatty acid and glycerol

    0Thank You

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

    0Thank You

    Adarsh Awasthi 5 years, 3 months ago

    Lipase is an enzyme secreated by pancreas. It break down food into fatty acid and glyicrol

    1Thank You

    Shivanshi Thakur 5 years, 3 months ago

    Lipase is an enzyme which u can say that it helps to breakdown the fats products for the further function it generates from pancrease ...

    2Thank You

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    • Posted by Priyanka Battise 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 4 answers

    Priyanka Battise 4 years, 11 months ago

    I'm sorry I've to write ajin instead of Mayank rai ..... Thanks u ajin for this long answer

    0Thank You

    Priyanka Battise 4 years, 11 months ago

    Thank u Mayank rai for this answer but you're late still thanks you for answering my questions ?did you learn it or you just paste it. ?

    0Thank You

    Riya Philip 4 years, 11 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

    1Thank You

    Mayank Rai 5 years, 3 months ago

    Galat h bada karne wali hui priyanka

    1Thank You

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    • Posted by Aman Aditya Kumar ... 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 1 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ?

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    • Posted by Ayan Pathan 5 years, 3 months ago

    CBSE > Class 10 > Science
    • 2 answers

    Riya Philip 5 years, 3 months ago

    Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

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    Yogita Ingle 5 years, 3 months ago

    An exothermic reaction is a reaction in which energy is liberated out.
    Respiration is considered as exothermic reaction because energy is released in this process.
    Glucose combines with oxygen present in our cells to form carbon dioxide and water along with energy.
    C₆H₁₂O₆ + 6O₂ ----> 6CO₂ + 6H₂O + energy

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