Tag: plant growth and development

Questions Related to plant growth and development

Vernalization is a phenomenon which concerns 

vernalisation plant growth growth and development plant growth and development biology

  1. Low temperature requirement for flowering in plants

  2. Migration of birds from their winter homes to summer habitats

  3. Immunization of infants against the common infectious diseases

  4. Entering of cold blooded animals into an inactive state in winter

Show answer
Correct Option: A
Explanation:

Vernalization is the acquisition of a plant's ability to flower in the spring by exposure to the prolonged cold of winter, or by an artificial equivalent. Many plants grown in temperate climates require vernalization and must experience a period of low winter temperature to initiate or accelerate the flowering process. This ensures that reproductive development and seed production occurs in spring and summer, rather than in autumn.

Chemical agent that has important role in flowering is

vernalisation plant growth growth and development plant growth and development biology

  1. Fluorocarbon

  2. GA${ _3}$

  3. Florigen

  4. Auxins

Show answer
Correct Option: C
Explanation:
a) Fluorocarbon is a compound containing only carbon and fluorine. These compounds can be used as refrigerants, solvents, and anesthetics.
b) Gibberellic Acid or GA$ _3$ is a plant hormone which regulates various developmental processes, including stem elongation, germination, dormancy, flowering, flower development and leaf and fruit senescence.
c) Florigen also called flowering hormone is the hypothesized hormone-like molecule responsible for flowering in plants.
d) Auxins are a class of plant hormones responsible for stem elongation and maintaining apical dominance.
So the correct answer is C.

What is vernalisation?

vernalisation plant growth growth and development plant growth and development biology

  1. Growth curve in response to light

  2. Recurrence of day and night

  3. Effect of day length on plant growth

  4. Acceleration of the ability to flower by low temperature treatment

Show answer
Correct Option: D
Explanation:

 Vernalization is the process of induction of flower by prolonged exposure to cold temperature. It is an adaptation shown by plants which are exposed to harsh winter followed by relatively short growing seasons. Vernalization is practiced artificially too.

Vernalization treatment can convert

vernalisation plant growth growth and development plant growth and development biology

  1. A biennial into an annual

  2. A spring variety into a winter variety

  3. An annual into a perennial

  4. All of these

Show answer
Correct Option: D
Explanation:

Vernalization is the process of inducing flowering to a plant by exposing the plant to cold of winter or through artificial processes. The process of Vernalization converts a biennial into an annual and spring variety into a winter variety and an annual into a perennial.

So the correct option is 'All of these.'

Vernalization is

vernalisation plant growth growth and development plant growth and development biology

  1. Growth curve related to light

  2. Effect of photoperiods on plant growth

  3. Speeding up ability to flower by low temperature

  4. Diurnal photoperiodicty

Show answer
Correct Option: C
Explanation:

In many plants, the temperature has a profound effect on flowering. Some plants do not flower under the inductive photoperiod conditions but flower when a cold temperature treatment is given to them. This acquisition or acceleration of the ability to flower by a chilling treatment is said to be vernalization. It is the method of inducing early flowering in plants by pretreatments of their seeds at a very low temperature. Thus option C is the correct answer. 

The pathway leading to flowering for plants that requires vernalization is the

vernalisation plant growth growth and development plant growth and development biology

  1. Seasonal pathway

  2. Light dependent pathway

  3. Temperature dependent pathway

  4. None of the above

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Correct Option: C

Which of the following can shorten the vegetative period of plants?

vernalisation plant growth growth and development plant growth and development biology

  1. Vernalization

  2. Apical meristem

  3. Germination

  4. All of the above

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Correct Option: A

Which of the following can replace the cold treatment for inducing flowering?

vernalisation plant growth growth and development plant growth and development biology

  1. Auxin

  2. Gibberellin

  3. Cytokinin

  4. None of the above

Show answer
Correct Option: B
Explanation:

When gibberellins were applied to certain cold-requiring plants, they flowered without low-temperature treatment. Thus it is conceivable that gibberellins could induce certain changes within the plant which in turn lead to flowering. Thus option B is the correct answer. 

Vernalization stimulates flowering in

vernalisation plant growth growth and development plant growth and development biology

  1. Turmeric

  2. Carrot

  3. Yam

  4. Ginger

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Correct Option: B

The key feature of vernalization is

vernalisation plant growth growth and development plant growth and development biology

  1. High temperature

  2. Low temperature

  3. Low moisture

  4. High humidity

Show answer
Correct Option: B
Explanation:

In many plants, the temperature has a profound effect on flowering. Some plants do not flower under the inductive photoperiod conditions but flower when a cold temperature treatment is given to them. This acquisition or acceleration of the ability to flower by a chilling treatment is said to be vernalization. It is the method of inducing early flowering in plants by pretreatments of their seeds at a very low temperature. Thus option B is the correct answer.