Ethylene

Q. While conducting an experiment on plant hormones a student found that on using a particular hormone abscission of leaves, senescence, cell division and growth was observed. Which hormone do you think was used on the plants?

1. Auxin
2. Ethylene
3. Abscisic acid
4. Cytokinin

Q. Ethylene is an unusual hormone because it is _____.

1. a gas
2. non-motile
3. transported by the xylem
4. transported by the phloem

Q.

Premature leaf fall starts when the amount of

1. Abscisic acid decreases

2. Auxin decreases

3. Auxin increases

4. Gibberellic acid decreases

Q.

Unseasonal flowering in pineapple may be achieved by the application of

1. 2, 4-D

2. BAP

3. NAA

4. IBA

Q.

Study the following statements

1.It promotes abscission and senescence of plant organs

2.It stimulates flowering for synchronized fruit set in pineapple.

3.It induces apical hook formation in dicot seedlings

4.It enhances respiration rate during ripening of fruits

The above are the physiological effects of a

1. Stress hormone, ABA
2. Flowering hormone, Auxin
3. Stem and Root elongation hormone, GA
4. Fruit ripening hormone, Ethylene

Q.

Which one of the following is incorrect with reference to ethylene?

1. Breaks seed and bud dormancy

2. Promotes rapid internode/petiole elongation in rice plants

3. Promotes root growth and root hair formation and increases transpiring surface area.

4. Causes synchronous senescence of leaves in tobacco

Q. What is meant by Climateric Ripening of fruits? Why the sythesis of ethylene is maximum during Climateric Ripening of fruits?

Q.

HOw auxins are able to induce parthenocarpy in plants eg. in tomatoes?

Explain in detail?