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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.
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.
See lessState the role of phloem in the transport of materials in plants.
The phloem plays a vital role in the transport system of plants. It is responsible for translocation, the process of transporting prepared food, mainly sucrose, from the leaves (where photosynthesis occurs) to different parts of the plant. This transport occurs in both upward and downward directionsRead more
The phloem plays a vital role in the transport system of plants. It is responsible for translocation, the process of transporting prepared food, mainly sucrose, from the leaves (where photosynthesis occurs) to different parts of the plant. This transport occurs in both upward and downward directions to supply energy to growing regions such as roots, shoots, flowers, and fruits. Phloem consists of specialized cells like sieve tubes and companion cells that facilitate this movement with the help of energy in the form of ATP. Thus, phloem ensures proper distribution of nutrients, supporting growth, storage, and overall functioning of the plant.
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