Tag: plants: structure and function

Quizzes (27) Questions (150)

Questions Related to plants: structure and function

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

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

  1. Sclarification

  2. Vernalization

  3. Chelation

  4. Stratification
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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

  1. Scarification

  2. Stratification

  3. Vernalisation

  4. Denudation
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. Zero to $4$ degrees C
  2. $15$ to $20$ degrees C
  3. $20$ to $30$ degrees C
  4. $30$ to $40$ degrees C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vernalization (often misspelled as verbalization) is the induction of a plant's flowering process by exposure to the prolonged cold of winter, typically in the range of 0 to 4 degrees Celsius.

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

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.

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Allelopathy involves the production of chemicals by plants that influence the growth of other plants. Statements 1, 2, and 3 correctly describe aspects of this phenomenon, including germination inhibition and spacing.

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

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

  1. Endogenous dormancy, morphological dormancy

  2. Exogenous dormancy, physiological dormancy

  3. Exogenous dormancy, morphological dormancy

  4. Endogenous dormancy, mechanical dormancy
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice biology plant growth seed dormancy fruit plants: structure and function

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

  1. Warmth

  2. Water

  3. Air

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

Which one does not exhibit seed dormancy?

  1. <p>Phaseolus</p>

  2. <p>Rhizophora</p>

  3. <p>Cassia</p>

  4. <p>Xanthium</p>
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As a viviparous plant, Rhizophora creates a propagule that is in reality a living tree. Though resembling an elongated seed pod, the fully-grown propagule on the mangrove is capable of rooting and producing a new tree. The trees are hermaphrodites, capable of self pollination or wind pollination. The tree undergoes no dormant stage as a seed, but rather progresses to a live plant before leaving its parent tree. A mangrove propagule may float in brackish water for over a year before rooting. So, the correct answer is 'Rhizophora'.