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Unlike animals, plants do not have any excretory products as they do not eat food. Comment upon the statement with justification.
It is completely wrong to say that plants do not produce any excretory products. However, plants use completely different strategies for excretion than those of the animals. They get rid of these wastes in different manner (any two): i. Oxygen, a photosynthetic waste, is removed through stomata. ii.Read more
It is completely wrong to say that plants do not produce any excretory products. However, plants use completely different strategies for excretion than those of the animals. They get rid of these wastes in different manner (any two):
i. Oxygen, a photosynthetic waste, is removed through stomata.
ii. Excess water is removed by transpiration through stomata.
iii. Other metabolic wastes are either stored in dead cells, resins and gums or are removed through falling of old leaves.
iv. Many waste products are stored in cellular vacuoles
See lessAssertion (A): Vulture will always have the least amount of pesticides in a food chain. Reason (R): Vulture occupies the last trophic level and it gets only 10% of energy of the previous trophic level.
The statement that vultures have the least amount of pesticides is false. In fact, they have the highest concentration due to biological magnification, where toxic substances like pesticides increase as we move up the food chain. The reason, however, is true, as vultures occupy the last trophic leveRead more
The statement that vultures have the least amount of pesticides is false. In fact, they have the highest concentration due to biological magnification, where toxic substances like pesticides increase as we move up the food chain. The reason, however, is true, as vultures occupy the last trophic level and receive only 10% of energy from the previous level. But this reason doesn’t explain the assertion. Therefore, the correct relationship between the two statements is false assertion and true reason. The correct option is (D).
See lessAssertion (A): Tallness of a pea plant is controlled by an enzyme. Reason (R): The gene for that enzyme makes proteins which help the plant to be tall.
The tallness of pea plants is controlled by a gene that produces a specific enzyme responsible for synthesising growth-promoting hormones. The presence of this enzyme results in tall plants, while its absence causes dwarfness. Hence, both the assertion and the reason are true, and the reason correctRead more
The tallness of pea plants is controlled by a gene that produces a specific enzyme responsible for synthesising growth-promoting hormones. The presence of this enzyme results in tall plants, while its absence causes dwarfness. Hence, both the assertion and the reason are true, and the reason correctly explains the assertion. This experiment demonstrates how genes control traits by producing proteins or enzymes that influence the physical characteristics of an organism. The correct option is (A).
See lessWhich of the following human activities has resulted in an increase of non-biodegradable substances?
Among the given options, using plastic as packaging material leads to the accumulation of non-biodegradable waste. Plastics take hundreds of years to decompose, polluting land and water bodies and harming animals who ingest them. In contrast, practices like organic farming, tree plantation, and compRead more
Among the given options, using plastic as packaging material leads to the accumulation of non-biodegradable waste. Plastics take hundreds of years to decompose, polluting land and water bodies and harming animals who ingest them. In contrast, practices like organic farming, tree plantation, and composting promote biodegradability and environmental balance. Hence, the increase in plastic usage by humans is the primary reason for the rise in non-biodegradable substances in the environment. The correct option is (C).
See lessWhich are the correct statements related to ozone? (i) Ozone layer helps in increasing the UV radiations reaching earth. (ii) Ozone is a deadly poison. (iii) Ozone layer shields the earth from UV radiations. (iv) Ozone layer prevents UV rays which cause skin cancer. (v) Ozone is formed with the help of Chloroflurocarbons.
Ozone near the Earth’s surface is poisonous, but in the stratosphere, it forms a protective ozone layer. This layer absorbs harmful ultraviolet (UV) radiation from the Sun, preventing skin cancer, cataracts, and damage to living organisms. The correct statements are (ii), (iii), and (iv) — ozone isRead more
Ozone near the Earth’s surface is poisonous, but in the stratosphere, it forms a protective ozone layer. This layer absorbs harmful ultraviolet (UV) radiation from the Sun, preventing skin cancer, cataracts, and damage to living organisms. The correct statements are (ii), (iii), and (iv) — ozone is toxic in nature but beneficial at higher altitudes because it shields the Earth from UV rays. Hence, the ozone layer is crucial for maintaining life on Earth. The correct option is (B).
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