Tag: botany

Questions Related to botany

Imbibition occurs due to?

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Increase in volume of imbibate

  2. Adsorption of imbibate by imbibant

  3. Absorption of imbibant by imbibate

  4. Loss of energy in the form of heat

Show answer
Correct Option: A
Explanation:
Imbibition is a special type of diffusion when water is absorbed by solids and colloids causing an enormous increase in volume. The substance that imbibes water is called imbibant, and the liquid which is imbibed is called imbibate. Imbibition occurs due to the increase in the volume of imbibate.

 Hence, the correct answer is option A.

Which of the following statements is correct?

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Cells shrink in hypertonic solution and swell in hypotonic solution.

  2. Imbibition is a special type of diffusion when water is absorbed by no living parts.

  3. Most of water flow in the roots occur via the apoplast.

  4. All of the above

Show answer
Correct Option: D
Explanation:

Following are the correct statements: 

(1) Cells shrink in a hypertonic solution and swell in the hypotonic solution.
(2) Imbibition is a special type of diffusion when water is absorbed by no living parts.
(3) Most of the water flow in the roots occur via the apoplast.
So, the correct answer is (d).

The principle used in pickling is

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Imbibition

  2. Endosmosis

  3. Plasmolysis

  4. None of the above

Show answer
Correct Option: A

Absorption of water from soil by seeds increases the _________ thus helping seedlings to come out of soil.

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. DPD

  2. Diffusion pressure

  3. Imbibition pressure

  4. Solute potential

Show answer
Correct Option: C
Explanation:

Imbibition is the initial step in the germination of the seeds. When mature seeds are sown in soil they imbibe water and swell. The water is imbibed first by seed coat and then by other tissues of embryo and endosperm. The process of imbibition is important ot initiate the seed germination. the pressure that an imbibant develops when submerged in pure imbibing liquid is called imbibition pressure.

The practice of breaking of rocks during rainy season by inserting wooden pegs in them is based on the phenomenon of ______________.

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Imbibition pressure

  2. Turgor pressure

  3. Osmotic pressure

  4. Wall pressure

Show answer
Correct Option: A
Explanation:

Imbibition pressure generated during germination of seeds and spores is so enormous that it can break asphalt roads and concrete pavements. In older times, the imbibition pressure was used in breaking the rocks and stones. Dry wooden stakes, if driven into a small crack in a rock and then soaked, can develop enough pressure to split the rock.

Choose the correct answers from the alternatives given.
The first process by which water enters into the seed coat when a seed is placed in a suitable situation for germination is

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Root pressure

  2. Absorption

  3. Osmosis

  4. Imbibition

Show answer
Correct Option: D
Explanation:

Imbibition is the process of absorption of water by hydrophilic solid particles. It is a special type of diffusion as the water moves along its concentration gradient. The classical example includes the absorption of water by seeds. This process plays an important role in the germination of seed, rupturing of the seed coat, and the emergence of seedlings is due to imbibition pressure developed by the seed kernel.

Hence, the correct answer is 'Imbibition'.

The uniformly sweet taste of coffee or tea is due to

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Spreading

  2. Permeability

  3. Distribution

  4. Diffusion

Show answer
Correct Option: D
Explanation:

Coffee and tea tastes uniformly sweet due to the diffusion of solvent from the high concentration to the lower concentration. There is no membrane and it is not the case of osmosis and permeability.

So the correct optoin is D.

Essence of environmental sciences involve:

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Social aspect

  2. Political aspect

  3. Economic aspect

  4. All of above

Show answer
Correct Option: D

An example of CAM plant is

botany photosynthesis cam cycle cam plants photosynthetic cycle

  1. Black Nightshade (Solanum nigrum)

  2. Lemon Grass (Cymbopogon flexuosus)

  3. Sugarbeet (Beta vulgaris)

  4. Snake Plant (Sanseveria trifasciata)

Show answer
Correct Option: D
Explanation:

Certain plants which have Crassulacean Acid Metabolism (CAM) are known as CAM plants. They have scotoactive stomata. It means their stomata remain open during the night. It is the characteristic feature of CAM plants. These plants fix carbon dioxide during the night but form sugars only during the day when RuBisCO is active. Sedum, Kalanchoe, Pineapple, Opuntia, Snake plant are the examples of CAM plants. These plants also perform double carbon dioxide fixation. The carbon dioxide acceptor in CAM plants is Phosphoenol pyruvic acid (PEP) during the night and Ribulose bisphosphate is carbon dioxide acceptor during the daytime. The first stable product in case of CAM plants is Oxalo acetic acid (OAA).

In CAM plants, $CO _2$ required for photosynthesis enters the plant body during

botany photosynthesis cam cycle cam plants photosynthetic cycle

  1. Daytime when the stomata are open.

  2. Night when the hydathodes are open.

  3. Daytime through the lenticels.

  4. Nights through the stomata which are kept open.

Show answer
Correct Option: D
Explanation:

CAM plants are those plants whose stomata open at night so that they can fix carbon-dioxide in the form of organic acids because these plants are adapted to grow in arid conditions. They accumulate carbon dioxide at night in vacuoles whereas in day time malic acid in transported to chloroplasts where it is again converted into carbon dioxide for photosynthesis. 

Thus, the correct answer is option D.