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The decomposers in an ecosystem: (A) synthesise inorganic material from similar forms (B) synthesise organic compounds from simpler carbon compound (C) convert organic material into inorganic forms (D) convert inorganic materials into organic compounds
ANSWER: (C) Explanation: Decomposers like bacteria and fungi break down dead plants, animals, and organic waste into simpler inorganic substances such as carbon dioxide, water, and minerals. These products are returned to the environment, where producers reuse them for photosynthesis and growth. ThuRead more
ANSWER: (C)
Explanation: Decomposers like bacteria and fungi break down dead plants, animals, and organic waste into simpler inorganic substances such as carbon dioxide, water, and minerals. These products are returned to the environment, where producers reuse them for photosynthesis and growth. Thus, decomposers recycle nutrients, clean the ecosystem of waste, and maintain the balance of nature.
See lessAssertion (A): A human child bears all the basic features of human beings. Reason (R): It looks exactly like its parents, showing very little variations.
ANSWER: (C) Explanation: Assertion (A): A human child bears all the basic features of human beings. Reason (R): It looks exactly like its parents, showing very little variations. The assertion is true because a child always shows the basic human characteristics. The reason is false because a child dRead more
ANSWER: (C)
Explanation: Assertion (A): A human child bears all the basic features of human beings.
Reason (R): It looks exactly like its parents, showing very little variations.
- The assertion is true because a child always shows the basic human characteristics.
- The reason is false because a child does not look exactly like its parents but shows variations due to sexual reproduction.
See lessAssertion (A): The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R): The oxygen atoms combine with molecular oxygen to form ozone.
ANSWER: (C) Explanation: Assertion (A): The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R): The oxygen atoms combine with molecular oxygen to form ozone. The assertion is true, as ozone depletion was first observed prominently in the 1980s. The reason is false, becaRead more
ANSWER: (C)
Explanation: Assertion (A): The amount of ozone in the atmosphere began to drop sharply in the 1980s.
Reason (R): The oxygen atoms combine with molecular oxygen to form ozone.
- The assertion is true, as ozone depletion was first observed prominently in the 1980s.
- The reason is false, because the drop was due to CFCs breaking ozone, not due to oxygen forming ozone.
See lessJust as humans require carbohydrates, proteins and fats, do plants require carbohydrates, proteins and fats in the same way? Explain.
ANSWER: Yes, plants also require carbohydrates, proteins, and fats, but they prepare them on their own. Through photosynthesis, plants make glucose (a carbohydrate), which provides energy and acts as the basic raw material. Proteins are formed when plants absorb nitrates from soil, which combine witRead more
ANSWER: Yes, plants also require carbohydrates, proteins, and fats, but they prepare them on their own. Through photosynthesis, plants make glucose (a carbohydrate), which provides energy and acts as the basic raw material. Proteins are formed when plants absorb nitrates from soil, which combine with glucose to produce amino acids and then proteins. Fats are produced when glycerol and fatty acids are synthesised inside plant cells using carbohydrates. Unlike humans, plants are autotrophs, so they manufacture these nutrients internally rather than consuming them.
See lessThe transport system in plants is relatively slower than in animals. Give reasons.
ANSWER: The transport system in plants is relatively slower than in animals because plants do not have a pumping organ like the heart. Instead, they rely on processes such as diffusion, osmosis, and transpiration pull, which are passive and slower in comparison. Moreover, plants do not require rapidRead more
ANSWER: The transport system in plants is relatively slower than in animals because plants do not have a pumping organ like the heart. Instead, they rely on processes such as diffusion, osmosis, and transpiration pull, which are passive and slower in comparison. Moreover, plants do not require rapid transport since they are sedentary and their needs for oxygen and food are lower.
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