Tag: absorption of water and minerals in plants

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

Match List I with List II and select the correct answer using the codes given the lists.

List-I(significance of the phenomenon in cell-water relations) List-II(Quantity)
a. Degree of hydration of protoplasm $1$. Wall pressure
b. Stretches cell walls and may lead to their enlargement if the walls are sufficiently plastic $2$. Water potential
c. Increases the free energy of water molecule $3$. Turgor pressure
d. Indicates the direction of diffusion of water $4$. Osmotic potential
  1. A-$1$, B-$3$, C-$2$, D-$4$
  2. A-$4$, B-$3$, C-$1$, D-$2$
  3. A-$4$, B-$1$, C-$2$, D-$3$
  4. A-$3$, B-$4$, C-$2$, D-$1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Matching the phenomena: (a) Degree of hydration relates to Turgor pressure (3), (b) Stretches cell walls relates to Wall pressure (1), (c) Increases free energy relates to Water potential (2), (d) Direction of diffusion relates to Osmotic potential (4).

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

Rate of water absorption can be increased through 

  1. Decreased transpiration

  2. Decreased ion absorption

  3. Increased photosynthesis

  4. Increased transpiration
Reveal answer Fill a bubble to check yourself
D 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 neighbouring 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 D.
Multiple choice biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

Roots play insignificant role in absorption of water in

  1. Sunflower

  2. Pistia

  3. Pea

  4. Wheat
Reveal answer Fill a bubble to check yourself
B Correct answer
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".

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

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

  1. Cohesion

  2. Adhesion

  3. Surface tension

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which of the following statements is incorrect?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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?

  1. H and O

  2. H and N

  3. C and O

  4. O and N
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plants obtain Carbon from CO2 in the air, Oxygen from air and water, Hydrogen from water, and Nitrogen from the soil. Therefore, H and N are the elements procured mainly through roots.

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

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

  1. Osmotic pressure

  2. Wall pressure

  3. Turgor pressure

  4. Tonic pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

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

  1. Carbon dioxide; oxygen

  2. Oxygen; water

  3. Water; oxygen

  4. Water; carbon dioxide
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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

  1. Move into the cell

  2. Show no net movement

  3. Move out of the cell

  4. Move in by endocytosis
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Image result for hypotonic hypertonic and isotonic solutions

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

The most important factor for absorption of water in plants is?

  1. Living cell

  2. Force of capillarity

  3. Imbibition

  4. Cohesive force of water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

While living cells and imbibition play roles, the force of capillarity (and the cohesive-adhesive properties of water) is the primary driver for the movement of water through the xylem in plants.