Tag: plant growth

Quizzes (10) Questions (270)

Questions Related to plant growth

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

_______ is naturally occurring growth inhibitor.

  1. Ethylene

  2. Abscissic acid

  3. Cytokinin

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

During drought and other unfavorable climatic conditions it is very important to maintain viability of the seeds. Abscissic acid is released during this condition and interacts with growth hormone in order to inhibit the growth of plant.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Which hormone is responsible for spoiling the whole barrel containing one bad apple?

  1. Ethylene gas

  2. Abscisic acid

  3. Auxin

  4. Gibberellins

  5. Cytokinins
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ethylene is gaseous hormone promotes fruit ripening and abscission. It diffuses from the rotten apple to other apples in the barrel and thereby causing spoilage of the whole barrel. ABA, auxins, gibberellins and cytokines are not gaseous hormones and therefore can not diffuse from one fruit to other. Thus, the correct answer is A.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

"One bad apple spoils the whole barrel" because of

  1. Ethylene gas

  2. Abscisic acid

  3. Auxin

  4. Gibberellins

  5. Cytokinins
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ethylene gas is the plant hormone that promotes fruit ripening and rotting. It also controls flower wilting and leaf fall by stimulating the conversion of starch and acid to sugars. Therefore, it is said that one bad apple will spoil the whole barrel because of ethylene gas.

Therefore, the correct answer is option A.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Presence of ethylene gas causes fruits to ripen. As fruit ripens, it produces increasing amounts of ethylene.

This is an example of

  1. Positive feedback

  2. Negative feedback

  3. Homeostasis

  4. Endocrine regulation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

ethylene gas is an aging hormone used for fruit ripening but may also cause the plant to die. Ethylene gas is released when the plant is damaged mechanically or physically.

So the correct option is 'Positive feedback.'

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

In the fall, the leaves of deciduous trees change color, fall off and die. This shedding of leaves is Mated by which of the following plant hormones? 

  1. auxin

  2. gibberellin

  3. abscisic acid

  4. cytokinin

  5. ethylene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Auxin plays role in cell elongation, apical dominance, root initiation, prevention of abscission, induction of parthenocarpy and also used as herbicide.
B. Gibberellin plays role in stem elongation, seed germination, breaking dormancy, elongation of internodes and inducing parthenocarpy.
C. Abscisic acid or ABA is known as stress hormone and induces stomatal closure, provides defence against salt and cold stress, induces dormancy, causes geotropism in roots and abscission of leaves, flowers and fruits.
D. Cytokinin plays role in promoting cell division and organ formation, delay in senescence, promoting lateral bud development in dicots, cell expansion in cotyledons leaves, promoting chloroplast development and chlorophyll synthesis.
E. Ethylene is a gaseous hormone and causes ripening of fruit.
So, the correct answer is 'Abscisic acid'.
Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Artificial ripening of which of the following fruits is useless ...............

  1. Mango

  2. Banana

  3. Guava

  4. Pomegranate or Coconut
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Artificial ripening of pomegranate and coconut is useless. It is not useful in these fruits because of their inner structure. In other fruits, calcium carbide is used for artificial ripening.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

A characteristic feature of some fruit ripening is sudden increase in respiration. It is known as

  1. Climacteric

  2. Anthesis

  3. Climatic

  4. Photorespiration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Certain fruits ripen with sudden rise in cellular respiration and ethylene production. Such fruits are called 'climacteric fruits'. Climacteric is considered final stage in fruit ripening process during which the fruit is maximum ripened with best taste for consumption. After that period, it starts to gradually deteriorate and the respiration returns to normal rate.

Hence the correct answer is 'Climacteric'.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Farmers of a particular region are concerned that premature yellowing of leaves of pulse crop might cause decrease in the yield. Which treatment could be beneficial to obtain maximum seed yield?

  1. Application of iron and magnesium to promote chlorophyll synthesis

  2. Frequent irrigation of crop

  3. Treatment of plants with cytokinins along with a small dose of nitrogen fertilizer
  4. Removal of all yellow leaves and spraying the remaining green leaves with $2, 4, 5-$T
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cytokinins promote cell division and delay senescence (yellowing) in leaves, while nitrogen is essential for chlorophyll synthesis, helping to maintain green leaves and improve yield in pulse crops.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Leaf abscission is promoted by

  1. Ethylene

  2. Abscisic acid

  3. Cytokinin

  4. Tryptophan
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Leaf abscission is a detachment or fall of older leaves.It occurs at the base of the petiole. During abscission, high synthesize of ethylene is observed along with decrease in the concentration of auxin. Ethylene synthesizes enzymes like cellulase and pectinase which are involved in cell wall degradation. These enzymes loosens the cell wall and cells separate which ultimately leads to leaf abscission. 

Thus, the correct answer is option A.