Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice transpiration major activities of living organisms biology

Which of the following water comes under echards?

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

Multiple choice transpiration major activities of living organisms biology

Plants growing on hills show?

  1. Higher rate of transpiration

  2. Lower rate of transpiration

  3. Same rate of transpiration

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

Plants on hills are exposed to higher wind speeds and lower atmospheric pressure, both of which increase the rate of evaporation and thus the rate of transpiration.

Multiple choice transpiration major activities of living organisms biology

What is true for the water available in the soil?

  1. Hollard = Chresard + Echard

  2. Hollard = Chresard Echard

  3. Chresard = Hollard + Echard

  4. Echard = Hollard + Chresard
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice transpiration major activities of living organisms biology

A soil is said to be physiologically dry when

  1. Soil is water logged

  2. Soil has high salt concentration

  3. Soil has low temperature

  4. All above cases prevail
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice transpiration major activities of living organisms biology

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

  1. $Intracellular \rightarrow Interstitial \rightarrow Plasma$
  2. $ Interstitial \rightarrow Intracellular \rightarrow Plasma$
  3. $Plasma \rightarrow Interstitial \rightarrow Intracellular$
  4. $Intracellular \rightarrow Plasma \rightarrow Interstitial $
Reveal answer Fill a bubble to check yourself
A Correct answer
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 $3\,liter$.

Multiple choice transpiration major activities of living organisms biology

The ion controlling stomatal movement is ____________.

  1. $Na^+$
  2. $Ca^{2+}$
  3. $Mg^{2+}$
  4. $K^+$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The accumulation of potassium ions (K+) in guard cells lowers their water potential, causing water to enter by osmosis, which leads to the opening of stomata.

Multiple choice transpiration major activities of living organisms biology

Which of the following processes keeps plant cool?

  1. Transpiration

  2. Guttation

  3. Photosynthesis

  4. Translocation
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice transpiration major activities of living organisms biology

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

  1. Absorption of water increases

  2. Absorption of water drecreases

  3. Absorption of water remain unaffected

  4. Both B and C are correct
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice transpiration major activities of living organisms biology

The chief role of transpiration in plants is to cause

  1. Loss of surplus water

  2. Cooling of the plant

  3. Rapid ascent of sap

  4. Rapid rise of minerals
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation


Transpiration is the process by which plants throw out the extra water present in it. Since water is an essential ingredient in the survival of the plants, it is absorbed through the roots. However, only a small amount of water is taken up for the metabolic activity. The rest 90-95% water is thrown out through the process of transpiration. The stomata along with the guard cells present in the underside of the leaves help the plants to transpire.  The process of transpiration enables the mass flow of mineral and water from the roots to the shoots and thus maintains the osmotic pressure of the cells and cools the plants.

Multiple choice transpiration major activities of living organisms biology

Day time loss of water in the vapour form from stomata is a trade off for intake of 

  1. Minerals

  2. Oxygen

  3. Carbon dioxide

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

In the day-time, when photosynthesis occurs, the guard cells are turgid while in the evening, regardless of the availability of water, these guard cells lose turgidity. When they are turgid, stomata open, and carbon dioxide enters freely. When they are flaccid, carbon dioxide is largely excluded, but water loss is also retarded. hence, the daytime loss of water in the vapor form from stomata is a trade-off for intake of carbon dioxide.

Thus, the correct answer is option (C).