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Water Absorption and Transport in Plants

Covers mechanisms of water absorption by roots, water transport pathways (apoplast and symplast), aquaporins, water potential gradients, and factors affecting water uptake in plants for Class-XI students.

11 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Choose the wrongly matched pair w.r.t. pathway of water absorption.


Apoplast pathway Symplast pathway
$(1)$ Involves intercellular spaces and cell wall Involves interconnected protoplasts
$(2)$ Water movement by cytoplasmic streaming Water movement by mass flow
$(3)$ Fast water movement Slow water movement
$(4)$ Occurs in epidermis and cortex Occurs in endodermis
  1. 1
  2. 2
  3. 3
  4. 4
Question 2 Multiple Choice (Single Answer)

Select the incorrect statements
(a) Older dying leaves export most of their mineral content to younger leaves
(b) Sulphur and calcium are frequently remobilised from senescing parts
(c) lons are absorbed from the soil by both passive and active transport
(d) A $C _3$ plant loses only half as much water as a $C _4$ plant for the same amount of $CO _2$ fixed

  1. (a), (b) and (c)
  2. Only (a) and (c)
  3. Only (b) and (d)
  4. All except (c)
Question 3 Multiple Choice (Single Answer)

Aquaporins are transport channels, which

(I) Are found in both plants and animals
(II) Allow for faster water movement between the cells than osmosis
(III) Allow water molecules to pass during transpiration
(IV) Do not open during drought stress

  1. III and IV
  2. Only II
  3. Only III
  4. I and II
Question 4 Multiple Choice (Single Answer)

In plants water moves from ________________.

  1. Less negative to more negative gradient
  2. More negative to less negative gradient
  3. Similar gradient
  4. Zero gradient
Question 5 Multiple Choice (Single Answer)

The passage of water and minerals is confirmly symplast in -

  1. Cortical layers
  2. Epidermis
  3. Endodermis
  4. xy cavity
Question 6 Multiple Choice (Single Answer)

Which of the following part of a plant absorbs water from the soil?

  1. Stem
  2. Root hairs
  3. Leaves
  4. All of the above
Question 7 Multiple Choice (Single Answer)

When the temperature of soil is $0^o$C then.

  1. The absorption of water increases
  2. The absorption of water is not affected by temperature
  3. The absorption of water decreases
  4. The soil will lose capillary water
Question 8 Multiple Choice (Single Answer)

The movement of water from one cell of the cortex to the adjacent one in roots is due to _________________.

  1. Water potential gradient
  2. Accumulation of inorganic salts in the cells
  3. Accumulation of organic compounds in the cell
  4. Chemical gradient
Question 9 Multiple Choice (Single Answer)

Water absorption through roots can be increased by keeping the plants

  1. In the shade
  2. In dim light
  3. Under the fan
  4. None of the above
Question 10 Multiple Choice (Single Answer)

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

  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
Question 11 Multiple Choice (Single Answer)

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

  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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