Tag: growth and development

Questions Related to growth and development

The practice of subjecting seeds to low temperatures for a period of time in order to cause growth and flowering during summer season is called as 

vernalisation plant growth growth and development plant growth and development biology

  1. Wintering

  2. Vernalization

  3. Devernalization

  4. Thermolysis

Show answer
Correct Option: B
Explanation:

Vernalization is the artificial exposure of plants to low temperatures in order to stimulate flowering or to enhance seed production. By satisfying the cold requirement of many temperate zone plants, flowering can be induced to occur earlier than normal or in warm climates lacking the requisite seasonal chilling.

The process of vernalisation is

vernalisation plant growth growth and development plant growth and development biology

  1. Aerobic

  2. Anaerobic

  3. Unaffected by aerobic or unaerobic conditions

  4. Dependent upon starvation conditions

Show answer
Correct Option: A
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. It is an aerobic process and requires metabolic energy obtained from oxygen.

Thus, the correct answer is 'Aerobic'.

Vernalisation promotes flowering in response to

vernalisation plant growth growth and development plant growth and development biology

  1. High light intensity

  2. Low temperature

  3. High temperature

  4. Low light intensity

Show answer
Correct Option: B
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold of winter. The term was coined by Lysenko in 1928.  He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Other terms like jarovization, springification were also coined for the same phenomenon. 

Thus, the correct answer is option B.

The term "vernalisation" was coined by

vernalisation plant growth growth and development plant growth and development biology

  1. Garner and Allard

  2. Darwin

  3. Geoffery

  4. Lysenko

Show answer
Correct Option: D
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds.

Thus, the correct answer is option D.

Hormone responsible for vernalization is

vernalisation plant growth growth and development plant growth and development biology

  1. Florigen

  2. Colchicine

  3. Abscisin

  4. Vernalin

Show answer
Correct Option: D
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold of winter. Plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Vernalin is a plant hormone that is produced on vernalization. It induces flowering in plants.

Thus, the correct answer is option D.

Low temperature treatment to speed up the process of flowering is referred to as

vernalisation plant growth growth and development plant growth and development biology

  1. Photoperiodism

  2. Vernalisation

  3. Thermoperiodism

  4. Hydroponics

Show answer
Correct Option: B
Explanation:
Vernalisation is the process of shortening of the juvenile or vegetative phase and hastening flowering by a previous cold treatment. In vernalization by cold treatment, winter varieties are transferred into spring or summer varieties. The site of vernalization is apical meristem or all the meristematic cells e.g., shoot tip, embryo tips, root apex etc.  The low temperature required for vernalization is usually $0^o-5^oC$. As a result of vernalization, a flowering hormone called vernalin is formed (reported by Melchers), but vernalin has never been isolated.
So the correct option is 'vernalization'.

Which one hastens flowering in plants?

vernalisation plant growth growth and development plant growth and development biology

  1. Stratification

  2. Scarification

  3. Vernalisation

  4. Water deficit

Show answer
Correct Option: C
Explanation:

Vernalisation is the process of that hastens to flower in plants by cold treatment. With the help of artificial cold treatment, winter wheat seeds can be induced to flower. 

Thus, the correct answer is option C.

Which of the following statements regarding photoperiodism is false?

vernalisation plant growth growth and development plant growth and development biology

  1. The response of plants to periods of light/day is termed as photoperiodism

  2. The shoot apices cannot perceive photoperiods

  3. In day neutral plants there is no correlation between exposure to light duration and induction of flowering response

  4. Shoot apices modify themselves into flowering apices prior to flowering

  5. The site of perception of light/dark duration is the flower

Show answer
Correct Option: E
Explanation:
Photoperiodism is the response of plants to photoperiods, that is the length of day and night. During photoperiodism, shoot apices modify themselves into flowering apices prior to flowering. However, they do not perceive photoperiods. Rather, the site of perception of light and dark duration are leaves. In day-neutral plants, induction of flowering response does not depend on exposure to light duration. The site of perception of light/dark duration is the leaves.
So, the correct answer is 'The site of perception of light/dark duration is the flower'.

Which is incorrect statement?

vernalisation plant growth growth and development plant growth and development biology

  1. There are no mesodermal cells in pseudocoelomates

  2. There is no body cavity in first triploblastic animals

  3. There is no second opening in diploblastic animal gut

  4. There is no co-ordination between cells of sponges

Show answer
Correct Option: A
Explanation:

Animals have a pseudocoelom that means  “false cavity”, which is a fluid-filled body cavity. Tissue derived from mesoderm partly lines the fluid-filled body cavity of these animals. It is mainly found in Nematoda.

So the correct option is 'There are no mesodermal cells in pseudocoelomates'

Seeds of winter varieties are benefitted by technique

vernalisation plant growth growth and development plant growth and development biology

  1. Senescence

  2. Photoperiodism

  3. Vernalisation

  4. Abscission

Show answer
Correct Option: C
Explanation:

Vernalisation is the phenomena in which flowering is induced in the plant by exposing it to low temperatures. Seeds of winter varieties will flower only when they are exposed to cold period early in their development. Artificially, flowering can be induced in spring as well if they are exposed to artificial vernalization. 

Thus, the correct answer is option C.