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Assertion (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).
See lessIn a cross between black furred rabbit (B) and white furred rabbit (b), all offspring were found to have black fur. What can be inferred about the genetic makeup of the parent rabbits?
In the given cross, a black-furred rabbit (B) is dominant, and a white-furred rabbit (b) is recessive. When a pure black rabbit (BB) is crossed with a pure white rabbit (bb), the F₁ generation gets the genotype Bb. All offspring appear black since the dominant gene masks the recessive one. Hence, thRead more
In the given cross, a black-furred rabbit (B) is dominant, and a white-furred rabbit (b) is recessive. When a pure black rabbit (BB) is crossed with a pure white rabbit (bb), the F₁ generation gets the genotype Bb. All offspring appear black since the dominant gene masks the recessive one. Hence, the correct parental cross is BB × bb, producing all black (Bb) rabbits in the F₁ generation due to dominance of the black fur gene. The correct option is (A).
See lessThe blood glucose level in a patient was very high. It may be due to inadequate secretion of:
The hormone insulin, secreted by the pancreas, controls the level of glucose in the blood. When insulin production is insufficient, glucose is not converted into glycogen for storage, leading to high blood sugar levels. This condition is called diabetes mellitus. It causes fatigue, frequent urinatioRead more
The hormone insulin, secreted by the pancreas, controls the level of glucose in the blood. When insulin production is insufficient, glucose is not converted into glycogen for storage, leading to high blood sugar levels. This condition is called diabetes mellitus. It causes fatigue, frequent urination, and increased thirst. Hence, the correct answer is insulin from the pancreas, as its lack is responsible for abnormally high glucose levels in the patient’s bloodstream. The correct option is (D).
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