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Which 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).
See lessWhich of the following is a correct combination of function and part of the brain?
The medulla oblongata, located in the hindbrain, is responsible for regulating involuntary activities like heartbeat, breathing, and blood pressure. It ensures that vital functions continue automatically without conscious control. The cerebrum controls voluntary actions, while pons and midbrain perfRead more
The medulla oblongata, located in the hindbrain, is responsible for regulating involuntary activities like heartbeat, breathing, and blood pressure. It ensures that vital functions continue automatically without conscious control. The cerebrum controls voluntary actions, while pons and midbrain perform other specific functions. Therefore, the correct combination is Blood pressure: Medulla in hindbrain, as this region coordinates and maintains the rhythmic functioning of the heart and lungs, ensuring a steady flow of blood throughout the body. The correct option is (D).
See lessWhich of the following options indicates the products formed after breakdown of the glucose in our muscle cells when there is lack of oxygen?
In the absence of sufficient oxygen, our muscle cells undergo anaerobic respiration. In this process, glucose is partially broken down to form lactic acid and a small amount of energy is released. This lactic acid accumulates in muscles, causing pain and fatigue after heavy exercise. When enough oxyRead more
In the absence of sufficient oxygen, our muscle cells undergo anaerobic respiration. In this process, glucose is partially broken down to form lactic acid and a small amount of energy is released. This lactic acid accumulates in muscles, causing pain and fatigue after heavy exercise. When enough oxygen becomes available, lactic acid is converted back to carbon dioxide and water. Thus, the correct answer is that lactic acid and energy are produced during anaerobic respiration in human muscle cells. The correct option is (B).
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