Tag: plant growth

Quizzes (10) Questions (270)

Questions Related to plant growth

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Which of the following is associated with dormancy of seeds?

  1. IBA

  2. GA

  3. Ethylene

  4. Ferulic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Germination Inhibitors: They occur in the seed coats and cotyledons of the embryos. The important germination inhibitors causing seed dormancy are abscisic acid, phenolic acid, ferulic acid, coumarin, short fatty acids and cyanogenic chemicals, e.g., Apple, Peach, Ash, Cucurbita, Iris, Xanthium. Counteracting Inhibitors: Inhibitors are destroyed by dipping seeds in KNO$ _3$, thiourea, ethylene chlorohydrin and gibberellin. IBA, GA, ethylene are counteracting inhibitors of seed dormancy while ferulic acid is a germination inhibitor. So, the correct answer is 'Ferulic acid'.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Prechilling treatment to break seed dormancy is

  1. Scarification

  2. Vernalisation

  3. Impaction

  4. Startification
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A. Scarification: Hard, impermeable seed coat is weakened or ruptured by filing, chip­ping, hot water 

B. Vernalisation- The cooling of seed during germination in order to accelerate flowering when it is planted.

C Impaction- It means to strike something with force. This method implies to the vigorous shaking of the seeds

D. Stratification: Seeds are moistened and exposed to oxygen for variable period at very low (chilling) or high temperature.

So, the correct answer is 'Stratification'.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Thiourea is used in overcoming seed dormancy by

  1. Chemical scarification

  2. Counteracting inhibitors

  3. Inducing cell division

  4. Develop osmotic pressure
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Thiourea acts as a chemical agent that helps break seed dormancy by counteracting the effects of germination inhibitors present in the seed.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Seeds of some plants do not germinate even under favourable conditions due to

  1. Dormancy

  2. Quiescence

  3. Vivipary

  4. Non-viability
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Quiescence is a condition in which seeds do not germinate due to unfavourable environmental conditions. When favrouable conditions return, the seed will germinate. Seeds of some plants do not germinate even under favourable conditions. This is called as dormancy. It is under endogenous control.

Thus, the correct answer is 'Dormancy'.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Among the following which compound can induce seed dormancy?

  1. Gibberellins

  2. Caffeine

  3. ABA

  4. Potassium nitrate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Abscisic acid (ABA) is the primary plant hormone responsible for inducing and maintaining seed dormancy to prevent premature germination.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Seed dormancy may be due to

  1. Permeable seed coat

  2. Hard impermeable seed coat

  3. Thin seed coat

  4. Lack of reserve food
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reasons of seed dormancy:

1. Immaturity of embryo: Embryo is immature at the time of seed shedding. The seed will remain dormant till the embryo becomes mature, e.g., Anemone nemorosa, Ranunculus ficaria.

2. After-Ripening: The seeds require a period of dry storage for developing the ability to germinate, e.g., Wheat, Oat, Barley.

3. Impermeable seed coat: The seed coat is impermeable to water and gases, e.g., Apple, Chenopodium.

4. Hard seed coat: The seed coat is mechanically resistant and does not allow the embryo to grow, e.g., Amaranthus, Lepidium.

5. Germination Inhibitors: They occur in the seed coats and cotyledons of the embryos. The important germination inhibitors causing seed dormancy are abscisic acid, phenolic acid, ferulic acid, coumarin, short fatty acids and cyanogenic chemicals, e.g., Apple, Peach, Ash, Cucurbita, Iris, Xanthium.

So, the correct answer is ‘Hard impermeable seed coat’.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

Seed dormancy allows the plants to

  1. Overcome unfavourable climatic conditions

  2. Develop healthy seeds

  3. Reduce viability

  4. Prevent deterioration of seeds
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Seed dormancy is an adaptive mechanism that prevents germination during unfavorable environmental conditions, ensuring the plant germinates only when conditions are suitable for survival.

Multiple choice biology plant growth seed dormancy fruit plants: structure and function

A method of breaking dormancy and allowing ample absorption of water is

  1. Stratification

  2. Scarification

  3. Vernalisation

  4. Devernalisation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A. Stratification: Seeds are moistened and exposed to oxygen for variable period at low or high temperature.

B. Scarification: Hard, impermeable seed coat is weakened or ruptured by filing, chip­ping, abosrbing hot water.

C. Vernalisation- The cooling of seed during germination in order to accelerate flowering when it is planted.

D. Devernalisation- The heating of seed during germination in order to deaccelrating flowering when it is planted.
So, the correct answer is 'Scarification'.