Tag: transport in plant

Questions Related to transport in plant

Roots play insignificant role in absorption of water in

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Sunflower

  2. Pistia

  3. Pea

  4. Wheat

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Correct Option: B
Explanation:

Pistia is a hydrophyte where absorption of water by root is insignificant   It floats on the surface of the water, its roots hanging submersed beneath floating leaves. 

So the correct option is "pistia".

The transpiration-driven ascent of xylem sap depends mainly upon _______ property of water.

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Cohesion

  2. Adhesion

  3. Surface tension

  4. All of these

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Correct Option: D
Explanation:

There is a continuous column of water from root through the stem and into the leaves. The water column is present in tracheary elements. The column of water does not fall down under the impact of gravity because forces of transpiration provide both energy and necessary pull. Cohesion, adhesion and surface tension-keep the water in place.

Which of the following statements is incorrect?

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Endodermis is impervious to water due to the presence of suberized Casparian strips

  2. Xylem vessels and tracheids, being non-living, are parts of the apoplast

  3. Ascent of sap is best explained by root pressure theory

  4. None of these

Show answer
Correct Option: C
Explanation:

Cohesion tension theory(Cohesion-tension and transpiration pull theory) explains the ascent of sap best. It was put forward by Dixon and Jolly in 18941894. It was further improved by Dixon in 19141914. Therefore, the theory is also named after him as Dixon's theory of ascent of sap. Today most of the workers believe in this theory.

Which of the four most abundant elements in most plants (C, H, O and N), does a terrestrial green plant procure mainly through its roots from the soil?

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. H and O

  2. H and N

  3. C and O

  4. O and N

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Correct Option: B

Choose the correct answers from the alternatives given.
Pressure on a plant cell wall caused by the osmotic movement of water is called

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Osmotic pressure

  2. Wall pressure

  3. Turgor pressure

  4. Tonic pressure

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Correct Option: C
Explanation:

When a plant cell is placed in the hypotonic solution, it causes endosmosis i.e. movement of surrounding water into the cell. This creates a turgor pressure against the rigid walls due to the entry of water.

Osmotic pressure is the hydrostatic pressure developed in a solution when it is separated from the pure solvent by a semi-permeable membrane in a rigid vessel.
Hence, the correct answer is 'Turgor pressure'.

Choose the correct answers from the alternatives given.
During the day most plants lose .......... and take up .......... 

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Carbon dioxide; oxygen

  2. Oxygen; water

  3. Water; oxygen

  4. Water; carbon dioxide

Show answer
Correct Option: D
Explanation:

During the day time, plants lose a lot of water in the form of water vapour due to the process of transpiration. Whereas it takes up carbon dioxide through stomata to carry out photosynthesis.

Hence,the correct answer is 'Water; carbon dioxide'.

Choose the correct answers from the alternatives given.
Immerse a living cell in a hypotonic solution, and water will tend to

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Move into the cell

  2. Show no net movement

  3. Move out of the cell

  4. Move in by endocytosis

Show answer
Correct Option: A
Explanation:

A hypotonic solution is one where the osmotic concentration of inside cell is less than the surrounding solution. Due to this difference, endosmosis occurs i.e. the surrounding solvent starts to move into the cell. 

In a hypertonic solution net movement occurs from inside of the cell to outside the cell whereas in isotonic solution net movement is zero.
Hence, the correct answer is 'Move into the cell'.
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The most important factor for absorption of water in plants is?

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Living cell

  2. Force of capillarity

  3. Imbibition

  4. Cohesive force of water

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Correct Option: B

Which is not true regarding active water absorption?

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Require energy

  2. Occurs only when transpiration is slow

  3. Living cells are essential

  4. Force develops in shoot

Show answer
Correct Option: D
Explanation:
  • Active absorption of water occurs in root cells which utilizes the metabolic energy released through respiration. It is of two types. Osmotic absorption is when water is ab­sorbed from the soil into the xylem of the roots according to the osmotic gradient. And Non-osmotic absorption is when water is absorbed against the osmotic gradient. Usually, transpiration is passive absorption but when it is low active absorption occurs. 
  • It takes place in living cells.
  • The force for passive absorption develops in shoot not of active absorption. 

So, the correct answer is 'Force develops in shoot'.

Death of protoplasm is a pre-requisite for a vital function like

biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

  1. Transport of sap

  2. Transport of food

  3. Absorption of water

  4. Gaseous exchange

Show answer
Correct Option: C
Explanation:
  • Hollow space is needed to allow water to pass. Hence the cells have to be empty thus dead for that. As water gets transported to the upper part of the plant, more water is absorbed.

So, the correct option is 'Absorption of water'