Tag: major activities of living organisms

Questions Related to major activities of living organisms

Transpiration is least in?

transpiration major activities of living organisms biology

  1. Good soil moisture

  2. High wind velocity

  3. Dry environment

  4. High atmosphere Humidity

Show answer
Correct Option: D
Explanation:

Loss of water in the form of water vapour through the aerial parts of the plant body is called Transpiration. The transpiration rate falls as the relative humidity of the air around the plant increases.
So, the correct option is 'High atmosphere Humidity'.

Which is the process mainly involved in transpiration?

transpiration major activities of living organisms biology

  1. Inhibition

  2. Respiration

  3. Osmotic pressure

  4. Diffusion

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Correct Option: A

Which of the following water comes under echards?

transpiration major activities of living organisms biology

  1. Available to the plant

  2. Whole of the soil water

  3. Amount of water not available to the plant

  4. None of the above

Show answer
Correct Option: C
Explanation:

Amount of water not available to plants is called as echard. It includes hygroscopic water and chemically bound water. 

Water present in the capillary spaces between soil particles is available to plants and is called as chresard. 
Whole water content of a field is called as hollard. It includes gravitational and surface run off water, chresard and echard water.

Plants growing on hills show?

transpiration major activities of living organisms biology

  1. Higher rate of transpiration

  2. Lower rate of transpiration

  3. Same rate of transpiration

  4. None of the above

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Correct Option: A

What is true for the water available in the soil?

transpiration major activities of living organisms biology

  1. Hollard = Chresard + Echard

  2. Hollard = Chresard Echard

  3. Chresard = Hollard + Echard

  4. Echard = Hollard + Chresard

Show answer
Correct Option: A
Explanation:

Amount of water not available to plants is called as echard. It includes hygroscopic water and chemically bound water. 

Water present in the capillary spaces between soil particles is available to plants and is called as chresard. 
Whole water content of a field is called as hollard. It includes gravitational and surface run off water, chresard and echard water.

A soil is said to be physiologically dry when

transpiration major activities of living organisms biology

  1. Soil is water logged

  2. Soil has high salt concentration

  3. Soil has low temperature

  4. All above cases prevail

Show answer
Correct Option: D
Explanation:

Physiologically dry soil means that water is present in the soil but is not available to the plants either because of high salt concentration, or lack of water in liquid form or poor aeration. These conditions respectively occur in saline marshes, cold deserts and water logged soil.

Arrange the following in descending order of volume: plasma, interstitial fluid, intracellular fluid.

transpiration major activities of living organisms biology

  1. $Intracellular \rightarrow Interstitial \rightarrow Plasma$

  2. $ Interstitial \rightarrow Intracellular \rightarrow Plasma$

  3. $Plasma \rightarrow Interstitial \rightarrow Intracellular$

  4. $Intracellular \rightarrow Plasma \rightarrow Interstitial $

Show answer
Correct Option: A
Explanation:

Volume of body fluids in a person of $70\,kg$ weight will be $42\,liter$, out of which intracellular fluid will be $28\,liter$, volume of interstitial fluid will be $11\,liter$ and plasma volume will be $3\,liter$.

The ion controlling stomatal movement is ____________.

transpiration major activities of living organisms biology

  1. $Na^+$

  2. $Ca^{2+}$

  3. $Mg^{2+}$

  4. $K^+$

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Correct Option: D

Which of the following processes keeps plant cool?

transpiration major activities of living organisms biology

  1. Transpiration

  2. Guttation

  3. Photosynthesis

  4. Translocation

Show answer
Correct Option: A
Explanation:

Transpiration keeps plant cool.

Cooling effect:
The leaves absorb the radiant energy. Some of the light energy is utilised in photosynthesis, rest is converted into heat energy resulting in an increase in leaf temperature. However, rapid loss of water in the form of water vapour from the aerial parts of the plant through transpiration brings down their temperature. Transpiration thus provides a significant cooling effect which keeps the plant from being over heated.

When the temperature of soil becomes $1^{\circ}$ $C$ then?

transpiration major activities of living organisms biology

  1. Absorption of water increases

  2. Absorption of water drecreases

  3. Absorption of water remain unaffected

  4. Both B and C are correct

Show answer
Correct Option: B
Explanation:

If the temperature of soil drops down drastically then absorption of water is decreased. This happens because one water starts changing its physical state from liquid to solid, so that passive absorption is decreased and the process of respiration stops at extreme temperatures. If respiration stops ATP will not be available for active absorption.