Tag: apoplast and symplastic pathway

Questions Related to apoplast and symplastic pathway

Rate of water absorption generally follows closely the rate of

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

  1. Transpiration

  2. Photosynthesis

  3. Respiration

  4. Growth

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Correct Option: A
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.

Water absorption through roots can be increased by keeping the plants

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

  1. In the shade

  2. In dim light

  3. Under the fan

  4. Covered with a polythene bag

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Correct Option: C
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'.

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

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

  1. Cell wall only

  2. Cell wall and inter cellular spaces

  3. Intercellular spaces

  4. Intercellular spaces, cell walls and endodermis.

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Correct Option: B
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'.

Apoplast is located

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

  1. Outside the plasma membrane

  2. In the entire cytosol

  3. inside the plasma membrane

  4. In the plastidial content

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Correct Option: A
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'.

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

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

  1. apoplast pathway

  2. symplast pathway

  3. vacuolar pathway

  4. transmembrane pathway

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Correct Option: A

Mark true statement about apoplast pathway.

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

  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

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Correct Option: C
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'

Movement of water through the symplast involves crossing the 

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

  1. Intercellular spaces

  2. Cell wall

  3. Cell membrane

  4. More than one option is correct

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Correct Option: C

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 

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

  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

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Correct Option: A

Most water flow in root occurs via apoplast as

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

  1. Cortical cells are living cells

  2. Cortical cells are loosely arranged

  3. Cortical cells are thin walled

  4. All the above

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Correct Option: B
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".

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

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

  1. i, ii and iv

  2. iii and iv

  3. i and ii

  4. ii and iv

  5. iv

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Correct Option: C
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.