Biology
A glowing matchstick starts burning in the presence of :
- Carbon dioxide gas
- Nitrogen gas
- Carbon monoxide gas
- Oxygen gas
Photosynthesis
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Answer
Oxygen gas
Reason — A glowing matchstick starts burning in the presence of oxygen gas.
Carbon dioxide does not support combustion. In fact, it is used to extinguish fires. Nitrogen is largely inert and does not support burning. Carbon monoxide is a combustible gas itself, but it does not support combustion of other substances like oxygen does.
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Which of the following is an end product of anaerobic respiration in plants ?
- Ethane
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Which of the following chemicals is used to identify the presence of starch ?
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Assertion (A): Green plants are autotrophs and they use carbon dioxide and water as raw materials to prepare their own food.
Reason (R): Chlorophyll and sunlight are also essential in the process of photosynthesis but they are not utilized as raw materials.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.