Tag: plant growth

Questions Related to plant growth

Which one of the following does NOT exhibit seed dormancy?

biology plant growth seed dormancy fruit plants: structure and function

  1. Rhizophoi

  2. Xanthium

  3. Phaseolus

  4. Cassia

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Correct Option: A

Dormancy is induced by.

biology plant growth seed dormancy fruit plants: structure and function

  1. Brassins

  2. Polyrnines

  3. Abscises acid

  4. Indoleacetic acid

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Correct Option: A

Treatment of seed at low temperature under moist conditions to break its dormancy is called -

biology plant growth seed dormancy fruit plants: structure and function

  1. Sclarification

  2. Vernalization

  3. Chelation

  4. Stratification

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Correct Option: D
Explanation:

  • Stratification involves the treatment of seed at low temperature(5−10 C)
under sufficiently moist conditions to break its dormancy and to induce germination. 
  • Scarification involves any damage or breakage of seed coat by physical methods (eg, use of a scalpel, wooden hammer, etc) or chemical methods (use of mild acids) to break seed dormancy. 
  • Vernalization and Chelation is the chill treatment Df plant in its early stages of life history to stimulate or induce early flowering

So, the correct answer is 'Stratification'.

Which method makes the seed coat permeable and allows growth of embryo?

biology plant growth seed dormancy fruit plants: structure and function

  1. Scarification

  2. Stratification

  3. Vernalisation

  4. Denudation

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Correct Option: A
Explanation:

Scarification in the method of weakening and opening the seed coat to initiate germination. It makes seed coat permeable. This method is employed for plant species which are impervious to water and gases.

Thus, the correct answer is 'Scarification'.

Verbalization is used to overcome chemical dormancy in seeds. The temperature range used for this purpose is?

biology plant growth seed dormancy fruit plants: structure and function

  1. Zero to $4$ degrees C

  2. $15$ to $20$ degrees C

  3. $20$ to $30$ degrees C

  4. $30$ to $40$ degrees C

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Correct Option: A

Consider the following statements regarding allelopathy.
a. It is the phenomenon of seed dormancy due to the presence germination inhibitors on the surface of seed coat.
b. It is the phenomenon of the production of organic substances by one plant having handful effect on the other.
c. It helps proper spacing of the plants to reduce competition.
d. It helps the xerophytes to grow in small groups to reduce the transpiration.
Of these statements.

biology plant growth seed dormancy fruit plants: structure and function

  1. $1, 2$ and $3$ are correct

  2. $1$ and $3$ are correct

  3. $2$ and $3$ are correct

  4. $1$ and $4$ are correct

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Correct Option: A

Which one of the folowing phytohrmones is known to contribute to hud dormancy?

biology plant growth seed dormancy fruit plants: structure and function

  1. Ehtylene

  2. Coumarin

  3. Cytokinin

  4. ABA

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Correct Option: A

Embryo are not differentiated into different tissues at the time of fruit ripening. Select option related to this statement?

biology plant growth seed dormancy fruit plants: structure and function

  1. Endogenous dormancy, morphological dormancy

  2. Exogenous dormancy, physiological dormancy

  3. Exogenous dormancy, morphological dormancy

  4. Endogenous dormancy, mechanical dormancy

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Correct Option: A
Explanation:
The dormancy caused by conditions within the embryo itself is called endogenous dormancy. It includes physiological dormancy, morphological dormancy, and combined dormancy, Morphological dormancy is a type of endogenous dormancy. In this, the embryo is underdeveloped or undifferentiated. Thus, the correct option is A.

Most of the phosphorus in the developing seeds is stored as.

biology plant growth seed dormancy fruit plants: structure and function

  1. Ergastic substances

  2. Phosphate

  3. Nucleic acid

  4. Phytic acid

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Correct Option: A

For a seed to germinate, the dormancy period will need to be broken by 

biology plant growth seed dormancy fruit plants: structure and function

  1. Warmth

  2. Water

  3. Air

  4. Both A and B

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Correct Option: D
Explanation:

Dormancy period is an inactive state of seed. To break down this state, seed require the favourable environment in which temperature and water play a major role to increase the metabolism as enzymes work on certain temperature and water breaks the seed coat by imbibition.

So the correct option is 'Both A and B'.