A man can survive with one kidney because a single healthy kidney can perform the functions of both: filtering blood, removing waste, balancing water and salts, and producing hormones. The remaining kidney enlarges slightly to compensate. class 10 science sample paper ...
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The correct answer is [C] A is true but R is false.The maximum concentration of chemicals and pesticides occurs at the highest trophic level, not the first. These chemicals are non-biodegradable, so they accumulate through the food chain, causing ...
The correct answer is [C] It is used as a refrigerant and in fire extinguishers.That statement is incorrect because ozone is not used as a refrigerant or in fire extinguishers. Instead, CFCs are used as refrigerants and are harmful ...
The correct answer is [A] Oestrogen.Oestrogen is the female sex hormone secreted by ovaries. It regulates the menstrual cycle and prepares the uterus for pregnancy. Lack of oestrogen causes irregularity, so doctors prescribe hormonal tablets to balance it. class 10 ...