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Standard X
Biology
Ethylene
Which one of ...
Question

Which one of the following responses of plants to growth hormones is true for ethylene?

A
Increase in cell elongation
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B
Decrease in the formation of female flowers
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C
Increase in ripening of fruits
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D
Decrease in abscission of flowers
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Solution

The correct option is C Increase in ripening of fruits
Ethylene affects fruit - ripening. Normally, when the seeds are mature, ethylene production increases and builds - up within the fruit, resulting in a climacteric event just before seed dispersal. The nuclear protein 'Ethylene Insensitive 2' is regulated by ethylene production, and in turn, regulates other hormones including ABA and stress hormones.

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Q.

What is the plant hormone responsible for fruit ripening and is important in abscission of leaves as well?


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


Q. Ethylene gas is a plant hormone that regulates plant growth, development and response to environmental stress. It is produced from leaves, roots, stems, flowers, and fruits, and it plays a major role in fruit ripening, flowering, and abscission (the natural shedding of leaves, flowers, and fruits). Like many hormones, ethylene functions via an intracellular signal transduction pathway illustrated in Figure 1 above:
Figure 1. Signal transduction pathway of ethylene in plant cells. Key: 1. Ethylene Gas 2. Plasma Membrane 3. Receptor Protein 4. Endoplasmic Reticulum 5. Constitutive Triple Response Protein Kinase 1 (CTR1) 6. Ethylene Insensitive 2 protein (EIN2) 7. Ethylene Insensitive 3 protein (EIN3) 8. DNA 9. mRNA 10. Enzyme production.
In the absence of ethylene gas, a receptor protein activates the CTR1 protein kinase, which represses EIN2 function. Recent studies with plants genetically engineered to have reduced gene expression of an ethylene receptor (Tieman, et al. 1999) showed an increase in ethylene sensitivity, including accelerated fruit ripening and flower aging.

Which statement best explains how the ethylene response is regulated in plants?

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Q. Match the following hormones with their functions.
Hormones Function
1.Ethylene i. Helps in cell division.
2.Gibberellin ii. Induces dormancy in buds and seeds
3.Cytokinin iii. Helps in the ripening of fruit
4.Abscisic acid iv. Causes bolting in plants

Q. Name the hormones which promotes growth and flowering in plants.
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