Tag: transport in plant

Quizzes (7) Questions (128)

Questions Related to transport in plant

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.

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.