Tag: transport in plants

Questions Related to transport in plants

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

Show answer
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

Show answer
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

Show answer
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

The water potential is?

water potential water potential and pressure plant water relation transport in plants biology

  1. Equal in soil and atmosphere

  2. Lowest in soil and highest in atmosphere

  3. Highest in soil and lowest in atmosphere

  4. Non-existent at both the places

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Correct Option: A

If the solute is added in the given solution than what observation can be made?

water potential water potential and pressure plant water relation transport in plants biology

  1. Its DPD decreases

  2. It's water potential decreases

  3. DPD & water potential remains unchanged

  4. Its water potential increases

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Correct Option: A

If some solute is dissolved in pure water, its water potential

water potential water potential and pressure plant water relation transport in plants biology

  1. remains same

  2. increases

  3. decreases

  4. first decreases then increases

Show answer
Correct Option: C
Explanation:

After adding, solute in water its water potential decreases and solute potential increases.

So the correct option is "Decreases".

Amount of water, to be used in photosynthesis and plant growth, is 

water potential water potential and pressure plant water relation transport in plants biology

  1. Equal to the amount of water absorbed

  2. Absorbed by active transport mainly

  3. Removed mostly by guttation in woody trees

  4. Less than 1 percent of absorbed water

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Correct Option: A

Which one is correct?

water potential water potential and pressure plant water relation transport in plants biology

  1. $\Psi _m=\Psi _p+\Psi _8+\Psi _w$

  2. $\Psi _w=\Psi _p+\Psi _8+\Psi _m$

  3. $\Psi _p=\Psi _w+\Psi _m+\Psi _8$

  4. $\Psi _w=\Psi _w+\Psi _p+\Psi _p+\Psi _8$

Show answer
Correct Option: A