Tag: cytokinins, ethylene and abscisic acid

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Questions Related to cytokinins, ethylene and 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.

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

Stomatal closure under stress conditions is due to

  1. IAA

  2. ABA

  3. IBA

  4. 2, 4-D
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stress hormone is a hormone produced during adverse environmental conditions. Abscisic acid (ABA) is called as stress hormone. Due to this hormone, plants respond to stresses conditions like cold, drought. Stomatal closure under stress condition is due to this hormone. It also promotes seed dormancy under adverse condition.

Thus, the correct answer is option B.

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

Abscisic acid controls

  1. Cell division

  2. Leaf fall and dormancy

  3. Shoot elongation

  4. Cell elongation and wall formation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Abscisic acid a plant hormone that plays important role abscission of leave. It inhibits stem elongation by inhibiting gibberellic acid. It prevents loss of dormancy in seeds. 

Thus, the correct answer is option B.

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

Bananas can be prevented from overripening by

  1. Maintaining them at room temperature

  2. Refrigeration

  3. Dipping in ascorbic acid solution

  4. Storing in a freezer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During ripening process, plants produce ethylene gas. To prevent overripening of bananas, the chemical reaction of ripening process needs to slow down. Cold temperatures will slow down the reaction and hence delay the ripening of banana. However, storing in freezer will slow down the ethylene emission more than refrigerating it.

Thus, the correct answer is option D.

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

Which combination is used in fruit ripening?

  1. $80$% $C{H} _{4} +20$% ${O} _{2}$
  2. $80$% ${C} _{2}{H} _{4} +20$% $C{O} _{2}$
  3. $80$% $C{O} _{2} +20$% ${C} _{2}{H} _{4}$
  4. $80$% $C{H} _{4} +20$% $C{O} _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ethylene is a gaseous plant hormone. It is also called as ripening hormone. It is used externally to accelerate the fruit ripening process. Also during ripening process, controlled amount of carbon dioxide and oxygen is needed. For artificially ripening fruit, 80% C$ _2$H$ _4$ and 20% CO$ _2$ is used.

Thus, the correct answer is option B.

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

Bud dormancy is induced by

  1. IAA

  2. GA

  3. ABA

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

Abscisic acid is a plant hormone. It is also called as stress hormone. It causes abscission of leaves. During stress environmental condition, its concentration increases and induces bud dormancy. When favorable condition returns, bud dormancy is broken.

Thus, the correct answer is option C.