Tag: absorption of water and minerals in plants

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Questions Related to absorption of water and minerals in plants

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

Maximum absorption of water by a root occur in the region of

  1. Cell division

  2. Cell elongation

  3. Cell maturation

  4. Cell division and root cap together
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a typical dicot root; root hairs are present in the zone of cell maturation. Root hairs are unicellular extensions of root epidermis, called as epiblema, which absorb water due to increased surface area for absorption. Zone of cell division, zone of elongation and root cap generally lack root hairs.

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

When the concentration of the soil solutes is low, the absorption of water is

  1. Retarted

  2. Increase

  3. Remains normal

  4. Stopped
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When concentration of soil solutes is low then the soil solution is hypotonic as compared to cell sap. Water always flows from a hypotonic solution to a hypertonic solution. Hence, when the soil solution is hypotonic due to low concentration of solutes, the water flows into the cell due to the process of endosmosis and absorption of water is increased.

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

During absorption of water by roots, the water potential of cell sap is lower than that of

  1. Pure water and soil solution

  2. Neither pure water nor soil solution

  3. Pure water but higher than that of soil solution

  4. Soil solution but higher than that of pure water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water flows from higher water potential to lower water potential. Water potential of pure water is zero. As solutes are dissolved in it, the water potential decreases. More the dissolved solutes, lower will be the water potential. Water potential of all the solutions is always negative. Hence, water flows from higher water potential (i.e., less negative water potential) towards a lower water potential (i.e., more negative water potential). It is clear that absorption of water will occur if water potential of cell sap is lower than pure water and soil solution.

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 statement(s) is/are incorrect?

  1. Water and salts are taken simultaneously by root hairs.

  2. Plants absorb one thing at a time either water or inorganic salt.

  3. Plants absorb excess quantity of water.

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

It is wrong to believe that water absorption and absorption of mineral salts are two unrelated processes. In fact the active uptake of ions is partly responsible for the water potential gradient in roots, and therefore for the uptake of water by osmosis. Some ions also move into the epidermal cells passively. Since soil has less concentration of minerals; most of the minerals are absorbed actively.

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

When concentration of solutes is low in the soil, absorption of water is 

  1. Stopped

  2. Increased

  3. Retarded

  4. Normal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Roots absorp water from soil through diffusion process. Diffusion occurs in the presence of  concentration gradient. When amount of solute is less in soil solution then amount of water is more in soil solution. In this condition more amount of water will diffuse from soil to roots that's why water absorption is increased.

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

Lignin and cellulose have affinity for water. This is called

  1. Adhesion

  2. Cohesion

  3. Root pressure

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • The attraction between the molecules of dissimilar substances is termed as adhesion. 
  • Walls of tracheid and vessels of xylem are made up of lignin and the cellulose. Hence due to the adhesive force, they have a close affinity for water.
  • So, the correct answer is option A.

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

A water-logged soil is physiologically dry because of

  1. Anaerobic conditions

  2. Non movement of water capillaries

  3. Increased viscosity of water

  4. Abundance of salts
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water-logging indicates to the concentration of soil with water. When the soil is saturated with water over the course of time leads to blockage of air phases and anaerobic condition is succeeded, now the soil may be regarded as waterlogged. In the intense condition (physiologically dry) continued waterlogging leads to anaerobiosis (life sustaining by organism in the absence of oxygen), mostly occurs to mesophytes roots, denitrification and methanogenesis due to reduced atmosphere. 

So, the correct answer is option A.

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

Root hair absorbs water from soil through

  1. Turgor pressure

  2. Ion exchange

  3. Osmosis

  4. DPD
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Root hair absorbs water from soil through osmosis. Water will be absorbed by root hairs by osmosis as the environment in the soil is hypotonic. This kind of absorption takes place passively. The water can easily move from the region of higher concentration to the low concentration without expenditure of energy. The cell membrane of the root cells acts as a semipermeable membrane. It passes the epidermis, cortex, endodermis, casparian strip and pericycle and protoxylem and metaxylem.

So, the correct answer is option C.

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

Loss of water taken place through.

  1. Stomata, cell wall of mesophyll cells and hydathodes

  2. Stomata and cell wall of mesophyll cells

  3. Stomata and hydathodes

  4. Cell wall of mesophyll cells and hydiahodes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water loss in plants occurs through transpiration (stomata), cuticular transpiration, and guttation (hydathodes). The cell wall of mesophyll cells is the site where evaporation starts, making option A the most comprehensive.

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

Whose water potential is less than water potential of root hair during water absorption (by root hair)?

  1. Gravitational water

  2. Pure water

  3. Vacuolar sap

  4. Soil solution
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For water to move into the root hair via osmosis, the water potential inside the root hair (specifically the vacuolar sap) must be lower than that of the soil solution.