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Chemical Coordinators

Ethylene is t...

Question

Ethylene is the plant hormone found in the form of gas.

A

Ethylene

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B

Zeatin

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Solution

The correct option is A
Ethylene

Ethylene is a gaseous phytohormone that promotes ripening of fruits. Apples and pears are examples of fruit that produce ethylene with ripening.

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Ethylene is the plant hormone found in the form of gas.

Ethylene is a gaseous plant hormone released outside the plant body.

Q. Assertion :Ethylene is a gas which acts as growth regulator of plants.
Reason: It is the most simple plant hormone.

A plant hormone related with inhibition of senescence is :

(a) Ethylene (b) ABA

(c) Bromic acid (d) GA

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 all hormones, ethylene functions via an intracellular signal transduction pathway, which is 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
What is the MOST direct evidence that the ethylene gas signaling mechanism functions to mediate gene expression?

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