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Environment CBSE Class 10

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Question 1/20

Q 1. What do ecologists call the transfer of energy which begins with the Sun and passes from one organism to the next in a food chain?


Energy flow refers to the flow of energy through a food chain which passes from one organism to the other. 

Q 2. The major gas responsible for the greenhouse effect is


Water vapour is the most dominant greenhouse gas. 

Q 3. Why is ultraviolet (UV) light capable of penetrating and burning the skin?


Since UV light has more energy than visible light, it penetrates and burns the skin. 

Q 4. A food web is more realistic than a food chain for showing the feeding relationships in ecosystems because


A food web is more significant than a food chain because producers are usually eaten by many different consumers, and consumers are eaten by more than one predator. 

Q 5. Decomposers help in


Decomposers help in recycling nutrients and breaking dead waste. 

Q 6. An organism accumulating a material in its body at a concentration greater than the environment is a phenomenon called


An organism accumulating a material in its body at a concentration greater than the environment is a phenomenon called biomagnification. 

Q 7. Biodegradable wastes can be converted to useful substances with


Biodegradable waste can be broken down into carbon dioxide, water and methane by bacteria during composting. 

Q 8. Which of the following is not an effect of modern agriculture?


Modern farming techniques combat biomagnification. 

Q 9. Energy flow in an ecosystem is


Energy which is captured by autotrophs does not return to the Sun. So, in the food chain, energy moves progressively through various trophic levels. This energy is no longer available to the previous trophic level. Thus, the flow of energy in a food chain is unidirectional. 

Q 10. A model which shows how energy passes from organism to organism is called


Energy which passes from one organism to another can be seen in a food chain. 

Q 11. Which of the following is not a greenhouse gas?


Carbon monoxide is a poisonous gas emitted from vehicles and factories. 

Q 12. Carbon dioxide contributes ______ % to global warming.


Carbon dioxide contributes 40 - 45% to global warming. 

Q 13. In an ecosystem, energy


Energy flow is one of the most fundamental processes, and it is common to all the ecosystems. 

Q 14. Which agency looks after the steps to reduce ozone depletion?


UNEP took up the issue of ozone depletion in 1976 and adopted a single but effective approach. 

Q 15. Which of the following is a difference between a food chain and a food web?


Food chains are graphically straight and linear, whereas food webs are complex. 

Q 16. Energy transferred to the next higher level


Energy decreases as it moves up trophic levels. 

Q 17. Depletion in the ozone layer is caused by


Depletion in the ozone layer is caused by chlorofluorocarbon. 

Q 18. Direct UV rays are capable of causing


UV rays can cause damage to our skin ranging from a light tan to sunburn. 

Q 19. Which of the following is the correct grazing food chain?


The correct grazing food chain is Grass-Grasshopper-Frog-Snake-Hawk. Grass is consumed by grasshopper; grasshopper is consumed by frog; frog is consumed by snake; snake is consumed by hawk. 

Q 20. Global warming also refers to


Climate change, also called global warming, refers to the rise in average surface temperature on the Earth. 

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