Tag: transport of water in plants

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Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Rate of water absorption generally follows closely the rate of

  1. Transpiration

  2. Photosynthesis

  3. Respiration

  4. Growth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The rate of transpiration is high on a bright sunny day. The water is lost from guard cell which leads to decrease in the water potential of guard cell as compared to the surrounding cell. To stabilize the water potential in the guard cell water rushes from the neighboring cell which creates a cohesion pull in the xylem vessels to pull the water up to the guard cell. Thus, the rate of water absorption increases when the transpiration is high. 
So, the correct answer is option A.
Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Water absorption through roots can be increased by keeping the plants

  1. In the shade

  2. In dim light

  3. Under the fan

  4. Covered with a polythene bag
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Water absorption through the roots can be increased by keeping the plants under the fan. 
  • As by keeping the plants under the fan, the transpiration process is boosted. Therefore, more amount of water and other minerals are absorbed by the plant roots from the soil. 
  • The more is the rate of evaporation of water from the plants the greater is the rate of transpiration.
  • Hence Water absorption through roots can be increased by keeping the plants under the fan.
  • So, the correct answer is 'Under the fan'.
Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

In root apoplast path of water transport; the water is transported through

  1. Cell wall only

  2. Cell wall and inter cellular spaces

  3. Intercellular spaces

  4. Intercellular spaces, cell walls and endodermis.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The water transport in the apoplastic pathway is through the cell membrane and the intercellular spaces. Water and solutes can pass freely through them.

This happens when water cannot enter the cells due to the presence of Caspian strips. 
So the correct answer is ' Cell wall and intercellular spaces'.

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Apoplast is located

  1. Outside the plasma membrane

  2. In the entire cytosol

  3. inside the plasma membrane

  4. In the plastidial content
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the Apoplast pathway water cannot enter the protoplasm.

It travels through  the space between the cell wall and cell membrane and intercellular spaces.
So the correct answer is 'Outside the plasma membrane'.

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

The pathway which water moves through cell wall without crossing any membrane

  1. apoplast pathway

  2. symplast pathway

  3. vacuolar pathway

  4. transmembrane pathway
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The apoplast pathway refers to the movement of water through the cell walls and intercellular spaces without crossing any plasma membranes.

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Mark true statement about apoplast pathway.

  1. Apoplast pathway may be aided by cytoplasmic streaming

  2. Apoplast pathway is continuous throughout the plant without any exception

  3. Apoplast pathway is faster than symplast pathway

  4. In Apoplast pathway mass flow of water occurs through plasmodesmata
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Apoplast is the system of cell walls which is continuous throughout the plant except in some parts like Casparian strips in the roots. Therefore it cannot be aided by cytoplasmic streaming and cannot occur through plasmodesmata. So, the correct answer is 'apoplast pathway is faster than the symplast pathway'

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Movement of water through the symplast involves crossing the 

  1. Intercellular spaces

  2. Cell wall

  3. Cell membrane

  4. More than one option is correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The symplast pathway involves the movement of water through the cytoplasm of cells, which requires crossing the cell membrane to enter and exit cells.

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Two cells A and B are adjacent to each other. The cell A has osmotic pressure 13 atm and turgor pressure 5 atm, while the cell B has osmotic pressure 6 atm and turgor pressure 2 atm. the result will be 

  1. Movement of water from cell A to B

  2. Movement of water from cell B to A

  3. Equilibrium of water transport between cell A and B

  4. No movement of water at all
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Most water flow in root occurs via apoplast as

  1. Cortical cells are living cells

  2. Cortical cells are loosely arranged

  3. Cortical cells are thin walled

  4. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Most of the water flow in the roots occurs via Apoplast since the cortical cells are loosely packed, and hence offer no resistance to water movement.

So, the answer is, "Cortical cells are loosely arranged".

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Apoplastic movement of water occurs exclusively through the 
(i) Intercellular spaces
(ii) Walls of the cells
(iii) Plasmodesmata
(iv) Cytoplasm

  1. i, ii and iv

  2. iii and iv

  3. i and ii

  4. ii and iv

  5. iv
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Apoplast absorption is a type of absorption where the water moves through the cell wall and intercellular spaces between the two cell. Water is absorbed by the root hair from the soil. It passes the epidermis, cortex, endodermis, casparian strip and pericycle and xylem. After reaching the xylem it is pulled up by the transpirational pull. 
So, the correct answer is option C.