Question

Pollen-pistil interaction refers to all the events starting from

• A. pollen deposition on the stigma until male gamete fuses with the egg cell.
• B. pollen deposition on the stigma until pollen tube enters the ovule.
• C. pollen deposition on the stigma until the growth of pollen tube starts.
• D. pollen deposition on stigma until the germination of pollen grains.

Answer 1

The correct option is B pollen deposition on the stigma until pollen tube enters the ovule.

Pollen-pistil interaction is just not a momentary interaction between the pollen and the pistil.
This interaction is a continuous dialogue between pollen grain and the pistil.
It helps the pistil to recognize the pollen and check for compatibility.
Hence, pollen-pistil interaction includes all the events right from the pollen deposition on the stigma until the pollen tube enters the ovule.