Bissoy.com
Doctors Medicines MCQs Q&A

Consider the following statement.  A. Transpiration takes place through a special opening called stomata.  B. It is also a process of excretion for plants.  C. The process acts as a cooling agent for plants.  D. It usually takes place at the stem of plants. Which among the following statements are true?

Consider the following statement.  A. Transpiration takes place through a special opening called stomata.  B. It is also a process of excretion for plants.  C. The process acts as a cooling agent for plants.  D. It usually takes place at the stem of plants. Which among the following statements are true? Correct Answer A, B, C

Concept:

Transpiration:

  • The term "transpiration" refers to the process of removing surplus water from the plant's body.
  • Water molecules in the plant tissues are removed from the aerial regions of the plants during transpiration.
  • Plants only use a small portion of the water they absorb for growth and development.
  • The remainder is expelled through transpiration.
  • 90% of excess water is transpired by stomata present in the leaves of the plants. 
  • A very little amount of water is transpired from the stems or barks of the plants with the help of lenticels.
  • Significance of transportation 
    • Excess water is removed through transpiration hence it is helping in the excretion of water.
    • It helps to keep the plant cool, hence it acts as a colling agent. 
    • Transpiration aids in the transportation of water and minerals throughout the plant.
    • A balance of water is maintained inside the plant due to the constant removal of water from the plant body.
    • It keeps the cells stiff and maintains osmosis.
    • Transpiration creates a suction force that aids in the upward transport of water in plants.


Explanation:

  • Hence only three following statements are true  - 
    • A. Transpiration takes place through a special opening called Stomata. 
    • B. It is also a process of excretion for plants. 
    • C. The process acts as a cooling agent for plants. 
  • ​A statement that is not true or is incorrect is -
    • D. It usually takes place at the stem of plants is incorrect because the majority of transpiration takes place from the stomatal opening present in leaves. 

  • So the correct option to this question is -A, B, C. (A, B, C statements are true)

Additional Information

Three types of transpiration are seen in plants - 

1. Stomatal Transpiration

  • It is the evaporation of water from a plant's stomata.
  • The majority of the water from the plants is lost through transpiration.
  • When the stomata open, the water at the surface of the leaves turns into vapor and evaporates.​
  • Water in liquid form converts to water vapor near the leaf's surface and evaporates from the plant through open stomata.​


2. Lenticular Transpiration

  • The evaporation of water from a plant's lenticels is known as lenticular transpiration.
  • Small gaps in the bark of branches and twigs are known as lenticels.
  • Lenticels are not found in all plants.
  • The amount of water lost in this method is tiny compared to stomatal transpiration, but it can increase in a dry environment, just like cuticular transpiration.


3. Cuticular Transpiration

  • The evaporation of water from a plant's cuticle is known as cuticular transpiration.
  • The cuticle is a waxy layer that covers a plant's leaf surface.
  • This type of transpiration does not account for much of a plant's water loss; the cuticle loses roughly 5-10% of the water in the leaves.

Related Questions

Study the following statements.
1. Excretion of water in the form of liquid droplets from leaves or uninjured plant parts is called gullation.
2. Transpiration help in ascent of sap.
3. Small opening in the leaf meant for gaseous exchange and transpiration is called stomata.
Which of the statements given above are correct ?
In tomato plant, red (R) is dominant over yellow (r) for fruit color and purple (P) is dominant over green (p) for stem color. Fruit color and stem color assort independently. The number of progeny plants of different fruit/stem colors obtained from a mating are as follows:
Red fruit, purple stem - 145
Red fruit, green stem - 184
Yellow fruit, purple stem - 66
Yellow fruit, green stem - 47
What are the genotypes of the parent plants in this mating?
Consider the following statements and choose the correct answer:
1. Transpiration usually occurs during day-time whereas guttation takes place in night
2. In transpiration water comes out in the form of liquid, whereas in guttation the water is given off in the form of vapour
3. Transpiration water is pure but guttation water contains inorganic salts and sugars
4. Transpiration is a controlled phenomenon whereas guttation is an uncontrolled phenomenon
Consider the following statements for cooling towers: 1. Cooling tower is an artificial device used to cool the hot cooling water coming out of condenser more effectively. 2. The amount of water usually lost with induced draft cooling tower ranges from 5% to 6% by evaporation. 3. The amount of water usually lost with induced draft cooling tower ranges from 7% to 8% by drift losses. 4. The rate of evaporation of water and its cooling effect on the remaining water depends upon the relative humidity of air passing through the tower. Which of the above statements are correct?
Which of the following statements about transpiration are correct? Statement 1: Low temperature increases the transpiration rate. Statement 2: Transpiration leads to water and vapor loss.
Empirical studies have shown that the women students are underrepresented in the disciplines such as science, technology, engineering, and mathematics (STEM). Its possible reasons could be (A) Women students do not feel comfortable with STEM subjects. (B) Women students cannot excel in STEM subjects (C) Women students lack aptitude in STEM subjects (D) Women students face threats due to negative stereotypes. (E) Women students are not encouraged by their parents to join STEM disciplines. Choose the correct answer from the options given below:
Consider the following statements.
1. When evaporation takes place, cooling takes place.
2. Evaporation takes place at all temperature, boiling takes place only at the boiling point.
3. Evaporation is a surface phenomenon.
Which of the statements given above is/are true?
With reference to 'stem cells', frequently in the news, which of the following statement(s) is/are correct?
1. Stem cells can be derived from mammals only.
2. Stem cells can be used for screening new drugs.
3. Stem cells can be used for medical therapies.
Select the correct answer:
With reference to 'stem cells', frequently in the news, which of the following statements is/are correct? 1. Stem cells can be derived from mammals only. 2. Stem cells can be used for screening new drugs. 3. Stem cells can be used for medical therapies. Select the correct answer using the codes given below.
Consider the following statements regarding sexual reproduction in plants: 1. Reproduction in plants takes place only through asexual methods. 2. Reproduction in spirogyra takes place through the process of fragmentation. 3. Vegetative propagation in plants can be achieved only by natural method. Which of the statements from above is/are correct?