Tag: major activities of living organisms

Questions Related to major activities of living organisms

Percolation of soil water to water table occurs through

transpiration major activities of living organisms biology

  1. Micropores less than 0.2 $\mu $m

  2. Micropores between 0.2 to 20.0 $\mu $m

  3. Macropores between 20-50 $\mu $m

  4. Macropores bigger than 50 $\mu $m

Show answer
Correct Option: D
Explanation:

Infiltration is downward entry of water into the soil whereas percolation is the downward flow of water through soil. Percolated water reaches deep in the soil to water table. Percolation of water first occurs through macropores that are bigger than 50 micron. These are present between soil particles and microspores. Later, percolation occurs through microspores.

Thus, the correct answer is option D.

Wetting of dried soil surface automatically during night without rain is

transpiration major activities of living organisms biology

  1. Night recovery

  2. Dew wetting

  3. Mist formation

  4. Ground frost

Show answer
Correct Option: A
Explanation:

During night, the dried soil surface becomes wet. This is due to the water droplets that forms a thin layer due to condensation. This is called as night recovery. As the soil surface cools at night by radiating its heat, moisture present in the atmosphere condenses. This results in the formation of water droplets on the soil. At night as the air cools to the dew point, condensation occurs and soil becomes wet without rain.

Thus, the correct answer is option A. 

Night recovery is caused by

transpiration major activities of living organisms biology

  1. Condensation of water vapours

  2. Local rain

  3. Capillary movement

  4. Both A and C

Show answer
Correct Option: A
Explanation:

During night, the dried soil surface becomes wet. This is due to the water droplets that forms a thin layer due to condensation. This is called as night recovery. As the soil surface cools at night by radiating its heat, water vapour present in the atmosphere condenses. This results in the formation of water droplets on the soil. At night as the air cools to the dew point, condensation occurs and soil becomes wet without rain.

Thus, the correct answer is option A. 

Choose the correct answers from the alternatives given.
The rate of transpiration in plants is more when

transpiration major activities of living organisms biology

  1. Atmosphere is dry

  2. Temperature is high

  3. Atmosphere is humid

  4. Atmosphere is dry and temperature is high

Show answer
Correct Option: D
Explanation:

Dry atmosphere means lack of moisture content in the air. Due to this, air has a lot of capacity to hold water and thus the rate of transpiration increases.

Similarly, high temperatures evaporate the water at a much higher rate thus again increasing the rate of transpiration. Humid atmosphere already contains a lot of moisture and can not hold more water and thus transpiration rate decreases.
Hence, the correct answer is 'Atmosphere is dry and the temperature is high'.

Choose the correct answers from the alternatives given.
Loss of water from the plants in the form of vapour state is known as

transpiration major activities of living organisms biology

  1. Guttation

  2. Imbibition

  3. Transpiration

  4. Translocation

Show answer
Correct Option: C
Explanation:

  • Water loss from the leaves in the form of water vapour through the openings called stomata is called transpiration.
  • Imbibition is a phenomenon that refers to the absorption of one substance by another, usually uptake of water by a plant or a seed.
  • Guttation is excretion of xylem sap on the tips of some plants through pores called hydathodes.
  • Translocation is the movement of the material from the source to sink inside the plant. Example, movement of starch from leaves to roots or other plant parts.
Hence, the correct answer is 'Transpiration'.