Tag: root, stem, and leaves

Questions Related to root, stem, and leaves

Transpiration.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. There are stomata on the leaves of the plants.Through these opening the excess of water is thrown out in the form of water vapors. This process is called transpiration

  2. There are two guard cells around the opening of stomata.They have an external membrane. They control the opening and closing of the stomata.

  3. Also come amount of water is lost due to evaporation from the leaves.

  4. As a result, water level in the epidermal layer of the leaf decrease

  5. To compensate this loss,more water is brought to the leaves through the xylem.

  6. Transpiration thus helps in absorption of water and minerals and their distribution to all parts of the plant

  7. Root pressure pushes the water up during the night time.

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Correct Option: A

The droplets of water arranged at the edges of leaves of roses in the morning are

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Water drops condensed from the atmosphere during night at low temperatures

  2. Water transpired from the stomata and lenticels

  3. Water produced on the leaves from the reaction of hydrogen and atmospheric oxygen

  4. None of the above

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Correct Option: B
Explanation:
Water droplets formed on the edge, tip, or the underside of leaves is not dew because dew comes from water condensing from the air and tends to settle evenly on the leaf’s upper surface.
Transpiration is the evaporative loss of water by plant. When the soil is too wet, water penetrates the plant through its roots and this creates pressure that forces the water to exit the plant in the form of droplets. This process doesn’t occur during the day, because the leaf’s stomata are open at that time. It occurs when the stomata close down, i.e. at night and water pressure begins to build up. Therefore, the droplets can be noticed when the sun comes up in the morning, before the drops evaporate.
So, the answer is B.

Transpiration is mainly a process of ______________.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Imbibition

  2. Respiration

  3. Osmotic pressure

  4. Diffusion

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Correct Option: D

Wilting occurs when there is ___________________.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Transpiration higher than absorption

  2. Absorption higher than transpiration

  3. Higher relative humidity of atmosphere

  4. Excess root pressure

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Correct Option: A

The process of loss of water through the leaves and stem is called

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Transpiration

  2. Respiration

  3. Photosynthesis

  4. Pollination

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Correct Option: A
Explanation:

Transpiration is the processin which water vapours are released from stomata.

Respiration is a metabolic processes which breaks down complex organic molecules to release energy.
Photosynthesis is the synthesis of sugar in the presence of sunlight, carbon dioxide and water.
Pollination is the transfer of pollen from male organ to female organ of a flower. 
So the correct answer is 'Transpiration'.

In transpiration, water is lost in         form whereas in guttation water is lost in the form of          

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Vapour, liquid

  2. Liquid, vapour

  3. Solid, vapour

  4. Vapour, solid

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Correct Option: A
Explanation:

In transpiration water is lost in the form of vapour whereas in guttation water in the form of liquid is lost. The loss of water in transpiration is through stomata whereas in guttation, it occurs through hydathodes.

The process by which plants lose water from leaves by evaporation is called as

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Respiration

  2. Photosynthesis

  3. Transpiration

  4. Absorption

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Correct Option: C
Explanation:

Transpiration is the process of release of water vapour from the stomata. 

Respiration is the process of breakdown of organic compounds to release energy.
Photosynthesis is the process of synthesis of food from inorganic compounds like carbon dioxide and water and sunlight.
Absorption is the uptake of substances into a system like absorption of water by the roots.
So the correct answer is ' Transpiration'.

Transpiration takes place maximum through which of the following structures in plants?

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Flowers

  2. Stem

  3. Leaves

  4. Roots

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Correct Option: C
Explanation:

Transpiration is the process of release of water vapour from the stomata.

The stomata are present on the leaves.
Their are other types of transpiration but 90% of it takes place through Stomata.
So the the correct answer is 'Leaves'.

Potometer works on the principle of -

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Potential difference between the tip of the

    tube and that of the plant

  2. Amount of water absorbed equals the amount

    transpired

  3. Osmotic pressure

  4. Root pressure

Show answer
Correct Option: B
Explanation:
A potometer is also known as transpirometer, is a device used for measuring the rate of water uptake of a leafy shoot which is almost equal to the water lost through the transpiration. The causes of water absorption are photosynthesis and transpiration.
So, the correct answer is 'Amount of water absorbed is equal to the amount transpired'.

Transpiration is best defined as

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. loss of water from the plant

  2. loss of water as vapour from the plant

  3. evaporation of water from the surface of leaves

  4. None of the above

Show answer
Correct Option: C
Explanation:

Transpiration is defined as the evaporation of water from plants, especially leaves. It occurs through leaves and other parts of the plant. It happens through leaves while their stomata remains open for the passage of CO2 and O2 during photosynthesis.

So, the answer is option C.