Tag: conduction of water and minerals

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Questions Related to conduction of water and minerals

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

The structures present in the roots to absorb water and minerals are 

  1. Epidermal appendages

  2. Epidermal extensions

  3. Hypodermis

  4. Endodermis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Root hairs are the lateral epidermal extensions or tubular outgrowths in the roots (zone of maturation) of plants.
  • The root hairs penetrate into the soil and prevent harmful microbes from entering the plant through the xylem vessels.
  • They increase the surface area for absorption of water and nutrients from the soil.
  • So, the correct answer is 'Epidermal extensions'.
Multiple choice biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

Select the correct sequence of passive absorption path of water in a plant

  1. Soil $\rightarrow $ Root hair $\rightarrow $ Epidermis $\rightarrow $ Secondary cortex $\rightarrow $ Endodermis $\rightarrow $ Pericycle $\rightarrow $ Metaxylem
  2. Soil $\rightarrow $ Root hair $\rightarrow $ Cortex $\rightarrow $ Passage cells $\rightarrow $ Pericycle $\rightarrow $ Root protoxylem $\rightarrow $ Root Metaxylem
  3. Soil $\rightarrow $ Epidermis $\rightarrow $ Cortex $\rightarrow $ Endodermis $\rightarrow $ Pericycle $\rightarrow $ Root metaxylem $\rightarrow $ Root protoxylem $\rightarrow $ Root hair
  4. Soil $\rightarrow $ Epidermis $\rightarrow $ Cortex $\rightarrow $ Pericycle $\rightarrow $ Endodermis $\rightarrow $ Root protoxylem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Option (A)
Soil $\rightarrow$ Root hair $\rightarrow$ Epidermis $\rightarrow$ Secondary cortex $\rightarrow$ Endodermis $\rightarrow$ Pericycle $\rightarrow$ Metaxylem.
The absorption of water by plants is essential for various metabolic activities. Soil water enters into the cortical cells through root hairs to reach the xylem of roots to maitain the supply of water.
Multiple choice biology transport in plant transport of water and minerals conduction of water and minerals absorption of water and minerals in plants

Suitable temperature for active absorption of water by root is

  1. $40\, -\, 45^{\circ} C$
  2. $10\, -\, 15^{\circ} C$
  3. $20\, -\, 35^{\circ} C$

  4. Can take at any temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Active absorption requires input of energy, which is obtained from cellular respiration. Respiration is an enzymatic process and is inhibited at extreme temperatures. Hence, the optimum temperature for active absorption is twenty to thirty five degree celsius.

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

At low temperature water absorption decreases due to
(I) An increase in the viscosity of water and protoplasm. 
(II) A decrease in the permeability of cell membranes.
(III) A decrease in the metabolic activities of root cells. 
(IV) A check in the growth and elongation of roots.

  1. I and II are correct

  2. I and III are correct

  3. I, II and III are correct

  4. All are correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

At low temperature, there will be physical changes in water and also water absorption, both due to active and passive means will decrease. There will be an increase in viscosity of water and decrease in respiration in roots. The decreased respiration will lead to reduced supply of ATP. Hence, active absorption will decrease. Also, growth of roots will suffer due to decrease in rate of metabolism. The cell membrane will become less permeable and there will be lesser movement of solutes across them. As temperature rises, the lipids become more fluidic and permit movement of more solutes across the membrane.

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

In poorly aerated soil, the rate of water absorption will

  1. Increase

  2. Decrease

  3. Remains the same

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

Poorly aerated soil, particularly when it is deficient in oxygen, retards absorption of water from the soil. Accumulation of $CO _2$ in the soil also inhibits absorption.

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

Root cap plays no role in the absorption of water in a plant, because

  1. Its cells are loosely arranged.

  2. It has no root hairs.

  3. It has no connection with xylem tissue.

  4. Its cells are dead.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Root hairs are unicellular extensions of root epidermis or epiblema. They increase the surface area for absorption and are involved with absorption of water. Root cap typically lacks root hairs and hence not involved in absorption process.

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

Many transplanted seeding may not survive because

  1. They do not like the new soil.

  2. They do not get required mineral salt.

  3. Most of the root hairs are lost during transplantation.

  4. The leaves get damaged.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Root hairs are important for absorption of water and minerals. If root hairs are damaged during transplantation absorption of water and minerals will suffer. Hence, transplanted seedling may not survive.