Tag: abscisic acid

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Multiple choice biology chemical coordination in plants abscisic acid fruit plants: structure and function

Which one prevents over-ripening of banana and browning of cut fruits?

  1. Gibberellic Acid

  2. Indole-3 Acetic Acid

  3. Ascorbic Acid

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

Lemon juice helps keep the apple from browning, because it is full of ascorbic acid (Vitamin C) and it has a low (acidic) pH level. Ascorbic acid works because oxygen will react with it before it will react with the polyphenol oxidase. However, once the ascorbic acid gets used up, the oxygen will start reacting with the enzyme and browning will occur. Lemon juice's low pH level also helps prevent browning. Polyphenol oxidase works best when the pH level is between 5.0 and 7.0. However, below a pH level of 3.0, the enzyme becomes inactivated. The pH of lemon juice is in the 2.0 range, making it very effective against browning.

Multiple choice biology chemical coordination in plants abscisic acid fruit plants: structure and function

Abscisic acid controls

  1. Cell elogation and cell wall formation

  2. Shoot elogation

  3. Leaf fall and dormancy

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

Abscissic acid regulates abscission (the shedding of leaves, flowers and fruits from the living plant) and dormancy. It acts as general plant growth inhibitor and also inhibit plant metabolism. It inhibits closure of stomata in epidermis, and increase tolerance of plant to various kinds of stresses, and therefore called as stress hormone.
ABA plays an important role in seed development, maturation and dormancy. By inducing dormancy, ABA helps seeds to withstand dessication and other factors favourable for growth.

Thus, the correct answer is option C.

Multiple choice biology chemical coordination in plants abscisic acid fruit plants: structure and function

State whether the following statements are true or false.
Dormancy of winter buds in temperate trees is caused by abscisic acid.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Abscisic acid is the hormones also called as stress hormones as they function in stress conditions. They are also known as dormant as they induce dormancy in buds. It mostly induced bud dormancy at the start of the winter season. They are generally growth hormone which inhibits growth normally.

So, the correct statement is 'True'.

Multiple choice biology chemical coordination in plants abscisic acid fruit plants: structure and function

State whether the following statements are true or false.
Dormancy of plants occurs in relation to abscisic acid.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dormancy is the period when the physiological activities of the plant slow down for some time. Abscisic acid is a stress hormone that is responsible for the protection of plants in drought conditions. They are generally growth inhibitors and are also called as dormants. They are mainly responsible for the bud dormancy at the time of winter season and also cause seed dormancy and protect it from desiccation.

So, the correct statement is 'True'.

Multiple choice biology chemical coordination in plants abscisic acid fruit plants: structure and function

Choose the correct answer from the alternatives given.
Which of the following plant hormones is associated with the closure of the stomata in a plant under water stress?

  1. Abscisic acid

  2. Auxin

  3. Cytokinin

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

Abscisic acid inhibits seed germination and stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses. Therefore, it is also called the stress hormone.

So, the correct option is 'Abscisic acid'. 

Multiple choice biology chemical coordination in plants abscisic acid fruit plants: structure and function

Leaf abscission is caused by

  1. ABA

  2. cytokinin

  3. auxin

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

A plant will abscise apart either to discard a membrane that is no longer necessary, such as a leaf during autumn or a flower following fertilization or for the purpose of reproduction. Most deciduous plants drop their leaves by abscission before winter, whereas evergreen plants continuously abscise their leaves.

So, the correct option is 'ABA'.