Mcq of Photoperiodism and Vernalisation

In plants, photoperiodism is the induction of blooming by exposing them to specific photoperiods at specific times (light and dark periods). By subjecting plants to freezing temperatures, vernalization is the process of inducing flowering in plants. Photoperiodism offers both the stimulus for flowering as well as the induction of flowering in plants.

1. Which of the following crops does not undergo vernalisation?
   1. Wheat 
   2.  Barley 
   3.  Rice 
   4.  Rye 

The correct answer is 4

 Explanation: Rice does not undergo vernalisation. Other crops, such as wheat, barley, and rye, which have spring and winter variations, require cold treatment to trigger the photoperiodic response of the plants.

2. Plants are capable of determining the duration of light exposure.
   1. True 
   2.  False

The correct answer is 1

Answer: an Explanation: Flowering in plants is dependent on the length of time the plant is exposed to light. Plants can determine the duration of sunlight received via their leaves. Florigen, a fictitious hormone, is said to be responsible for flowering.

3. Statement A: The critical length varies according to the plant.

Day-neutral plants are those that are not dependent on crucial duration.

1. 1. Both the statements are true
   2. Both the statements are false
   3.  Statement A is true but Statement B is false
   4. Statement B is true but Statement A is false

The correct answer is  3

Explanation: The critical duration is a well-defined period during which a plant is exposed to light and darkness in order to initiate blooming. It varies according on the plant. Certain plants, such as short day plants, require exposure for a shorter length than the crucial duration. Certain plants, such as long day plants, require exposure longer than the essential length. Additionally, there are plants that are not critical duration dependent. They are sometimes referred to as day-neutral plants.

4. Which of the following plants is considered polycarpic?
   1. Sugarbeet
   2. Cabbage 
   3. Carrots
   4. apple

The correct answer is 4

Explanation: Polycarpic plants are those that reproduce several times before reaching senescence. Apple is a dicotyledonous plant. Sugarbeet, Cabbage, and Carrots are all biennial vegetables. Biennials are plants that have a two-season life cycle.

5. Statement A: Plants with short days required greater light exposure than the necessary time.

Long day plants require less light exposure than the necessary length.

1. 1. Both the statements are true
   2. Both the statements are false
   3. Statement A is true but Statement B is false
   4. Statement B is true but Statement A is false

The correct answer is 2

Answer: b Explanation: Plants require a well-defined exposure to light and darkness in order to initiate flowering. Short day plants require less light exposure than long day plants. Long day plants required more than the essential length of light.

6. Affirmation A: Vernalisation retards reproductive development.

Vernalisation increases flowering by cold therapy.

1. 1. Both the statements are true
   2.  Both the statements are false
   3. Statement A is true but Statement B is false
   4.  Statement B is true but Statement A is false

The correct answer is  1

Explanation: Vernalisation is a phenomenon that occurs when plants are exposed to cold circumstances and improves their qualitative and quantitative flowering. It serves two purposes. It enables the plants to reach their greatest potential. Additionally, it promotes early blooming of plants by creating the necessary circumstances.

7. The length of the light period is more significant than the length of the dark period.
   1. True 
   2.  False 

the correct answer is 2

Answer: Explanation: Both light and dark durations are critical. The critical duration of the periods is required for the phytochromes present in the plant to operate properly.

8. Statement A: A hypothetical hormone regulates plants’ response to low temperatures.

Statement B: A hypothetical hormone similarly regulates the response of plants to varied periods of light.

1. 1.  Both statements are true 
   2.  Both statements are false
   3.  Statement A is true but Statement B is false
   4. Statement B is true but Statement A is false

the correct answer is 1

Explanation: Vernalisation is a phenomenon that occurs when plants are exposed to cold circumstances and improves their qualitative and quantitative flowering. Plants’ response to low temperatures is mediated by a fictitious hormone called Vernalin. Photoperiodism is the plant’s response to the duration of its exposure to light and darkness. Additionally, it is regulated by a fictitious hormone called Florigen.

9. Where is the location of the light/dark duration perception?
   1.  The leaves;
   2.  The stem;
   3. The roots; 
   4. The apical bud.

The correct answer is 1

Explanation: Leaves are the receptors for light/dark duration perception. Florigen is in charge of flowering. Prior to flowering, shoot apices are converted to flowering apices. Additionally, the hormone migrates to the stem and roots.

10.) _______ is the hormone responsible for flowering.

1. 1.  vernalin
   2.  cytokinin
   3. aminobutyric acid 
   4. florigen

The correct answer is 4

Explanation: Florigen, a fictitious hormone, is supposed to be responsible for flowering in plants. Vernalin stimulates early maturation, which results in flowering. ABA is primarily an inhibitor and has a calming effect in stressful conditions. Cytokinin increases the growth of shoots.

11. _____ has an effect on the blossoming process in plants.
    1.  Photographic period
    2.  Soil water
    3. The soil’s acidity
    4. Concentration of green pigment

The correct answer is 1

12. Phytochrome is a photosensitive pigment that plays an important role in .
    1.  Geotropism
    2. Phototropism is a type of phototropism.
    3. Photoperiodism 
    4.  Photorespiratory evaporation

The correct answer is 3

13. Phytochrome, the blue-green pigment, is found in which of the following living species?
    1. Algae
    2. Mushrooms
    3. Flowering plants
    4. Cryptograms of the vasculature

The correct answer is 3

14. In plants, the transition from the vegetative to reproductive phase occurs in response to______.
15. 1.  Duration of the day
    2.  the degree to which a temperature is extreme
    3.  The amount of oxygen in the air
    4. mostly the available food in the soil

The correct answer is 1

15. The reversal of etiolation brought about by light is referred to as_____.
16. 1. Photomorphogenesis 
    2. The Lang-Richmond effect
    3. Expansion of the anisotropic wall
    4. Interaction of red and distant red light

The correct answer is 1