Question

In some plants, fruits develop without fertilization because the placental tissue of unfertilized ovary produces

• A. Gibberellins
• B. Cytokinins
• C. Auxins
• D. Ethylene

Hint:

Fruit formation without fertilization is called parthenocarpy and is linked to one growth hormone.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Development of a fruit without fertilization is called parthenocarpy. Such fruits are seedless.

Step 2: Role of the hormone
In plants like banana, grapes and some citrus fruits, the placental tissue of the unfertilized ovary makes enough auxin. This makes the ovary wall grow into a fruit.

Step 3: Other hormones
Gibberellins cause stem elongation, cytokinins promote cell division, and ethylene ripens fruits, so they are not the placental hormone here.

Step 4: Conclusion
The placental tissue produces auxins.

Final Answer:
The placental tissue of the unfertilized ovary produces auxins. \[ \boxed{\text{(C) }\text{Auxins}} \]