Tag: need of water

Questions Related to need of water

Water absorption through roots can be increased by keeping the plants

need of water transport in plants biology

  1. In the shade

  2. In dim light

  3. Under the fan

  4. None of the above

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Correct Option: C
Explanation:

Water absorption can be increased by increasing Transpiration which can be increased by

1. Increasing the intensity of light
2. Increasing the wind speed.
Hence if kept under the fan, the water absorption increases.
So the correct answer is 'Under the fan'.

The root-hairs are suited for absorbing water from the soil because

need of water transport in plants biology

  1. Root-hairs have a large surface area

  2. Roots have a semi-permeable membrane

  3. Roots contain a solution of higher concentration than the surrounding water.

  4. All the three

Show answer
Correct Option: D

Choose the correct answers from the alternatives given.
Field capacity is

need of water transport in plants biology

  1. The same as permanent wilting point

  2. The amount of water in soil after drainage takes place

  3. Higher for sandy soils than clay soils

  4. The amount of water in soil available to plants

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Correct Option: B
Explanation:

Field capacity is the amount of soil moisture or water content held in the soil after excess of water has been drained out. Wilting point or permanent wilting point is the minimal amount of soil moisture that is required by the plant not to wilt. This is not the same as field capacity because sometimes drainage of water occurs more than required that causes wilting and even death of the plant.

Hence, the correct answer is 'The amount of water in the soil after drainage takes place'.

State whether the following statements are true or false.
A membrane which allows certain substances to pass through it, but not others is called a selectively permeable membrane.

need of water transport in plants biology

  1. True

  2. False

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Correct Option: A
Explanation:

A membrane that allows certain substances to pass through it either by diffusion, passive transport or active transport, it is called selectively permeable membrane. For example, water moves passively through small pores of this membrane.

So, the correct option is 'True'.


The mineral ions absorbed by roots reach the leaves through sieve elements

need of water transport in plants biology

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Sieve elements are used to transport organic compounds made during photosynthesis in plants. Sieve elements are the major conducting cells in the phloem. But sieve elements don't transfer the mineral ions absorbed by roots to the leaves

So the given statement is false