Give reasons for the following
i) Grapes shrink when immersed in a very strong sugar solution
ii) We gargle with saline water in case of throat infection.
iii) Plants growing in fertilized soil are often found to wilt, if the soil is not adequately
watered. Why?
iv) A higher rate of transpiration is recorded on a windy day rather than on a calm day.
v) Transplanting of seedlings to flowerbed in the evening is better than doing so in the
morning.
Answers
Answer:
1 Answer. Very strong sugar solution is hypertonic to the grapes juice. Therefore, water from inside the grapes moves to outside hypertonic solution. It results shrinkage of the grapes.
Answer 2 Gargling with salt water also helps to remove the mucus build-up in your respiratory tract and nasal cavity. The concoction reduces the inflammation and relieves the pain in the throat. Apart from that, it flushes out the bacteria and virus, which if left unattended can lead to congestion.
3 Answer Plants growing in fertilized soil are often found to wilt if the soil is inadequately watered because when the soil is not adequately watered, the concentration of soil solution becomes very high. Due to this, water moves out from the root hair cells into the soil due to exosmosis.
4 Answer Wind is one of the external factors that increase the rate of transpiration. Wind usually carries away the moistures present in the atmosphere making it dry enough to absorb more water vapours from the plants. This results in higher rate of transpiration in windy atmosphere than on a calm day.
5Answer Transplantation causes stress to the seedlings. If the seedlings are transplanted in the morning, they would have to immediately bear the additional stress of excessive transpiration occurring during the hot afternoon. ... Therefore, it is better to transplant seedling in a flower bed in the evening and not in the morning.
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