Pls answer in detail and explain explain the concept also

Dear Student

Correct option is (3)

Ethylene is a phytohormone which is produced in the plant under the conditions of mechanical stress. It protects seedlings from getting damaged during germination.  

Ethylene has some influence on germinating seedlings, this is known as triple response.
1. Elongation of internode is inhibited making the stems short.
2. Increase in the thickness of the stem.
3. Seedlings grow horizontally without responding to gravitropism giving rise to auxin imbalance. 

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