True-False

Question 11 Mark

Photosynthesis fix up the solar energy and make it available in a food chain.

Answer

True.Explanation:
The process of photosynthesis in plants involves a series of steps and reactions that use solar energy, water, and carbon dioxide to produce organic compounds and oxygen.

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Question 21 Mark

Non-biodegradable wastes are the major pollutants of the environment.

Answer

True.Explanation:
The natural agents involved in the degradation are air, water, microorganisms, sunlight, soil, etc. Non-biodegradable substances are those wastes which do not decompose naturally in the environment, causes pollution and are also harmful to the living being.

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Question 31 Mark

State whether the following statements are true or false:
In biology, human beings are called producers.

Answer

False

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Question 41 Mark

Decrease in predator population will decrease the preypopulation.

Answer

True.Explanation:
When prey is abundant, predator populations increase because more young are able to survive. More predators kill more prey, which, along with food scarcity, decreases the population.

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Question 51 Mark

State whether the following statement is true or false:
Only 10 per cent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.

Answer

False.

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Question 61 Mark

Pesticides enter the food chain at the consumer level.

Answer

True.Explanation:
The pesticides enter a food chain and subsequently get into our body by the following way: Pesticides are sprayed on the crop plants to protect them from the attack of pests.

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Question 71 Mark

Secondary consumers and tertiary consumers, both are carnivores.

Answer

True.

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