Question

Fruit ripening hormone is
A. Kinetin
B. Gibberellin
C. Ethylene
D. Indole acetic acid

Answer 1

Hint: This hormone mobilizes the genes to synthesize the enzymes which are responsible for fruit ripening. When a fruit ripens it produces more ethylene and carbon-dioxide.

Complete Answer:
Ethylene is a plant hormone controlling fruit ripening by correlating the expression of genes that are the reason for many functions like- an increase in respiration, autocatalytic ethylene formation and modifications in color, composition, perfume and taste.

Now, let us find the solution from the option.
- Kinetin is a type of cytokinin, a class of plant hormone that helps in cell division.
- Gibberellin (GA) is plant hormones that control many processes including plant growth, organ development, and environmental responses.
- Scientists early 20th century observed that the gas ethylene has several effects on plant growth, but not until 1934 did they demonstrate that plants produce ethylene. This natural hormone influences many plant processes.
- Ethylene stops cell extension, helps in seed germination, promotes apical dominance, and is associated with plant responses to injuries or invasion by disease occurring microorganisms.
- Ethylene also has a major role in many aspects of senescence, including fruit ripening. As a fruit ripens, it produces ethylene, which triggers an acceleration of the ripening process. This induces the fruit to produce more ethylene, which further accelerates ripening.
- IAA is the main auxin in plants, regulating developmental processes like cell separation and elongation, tissue differentiation, apical dominance, and responses to light, gravity, and pathogens.

Thus, the correct option is C. i.e. Ethylene.

Note: Ethylene is a gas and is also known as the “fruit-ripening hormone which is mentioned above. Each fruit has a specific level of ethylene formation throughout its lifespan. However, in some fruits, ethylene ranges exposed when the fruit begins ripening.