Describe the out breeding devices that prevent the auto-gamy.

Explanation

Continued self-pollination results in inbreeding depression, flowering plants have developed out-breeding devices to discourage self-pollination and to encourage cross-pollination.
Pollen grains are released before the stigma becomes receptive or stigma becomes receptive before pollens are released.
2. In some species the anthers and stigma are placed in different position, so that pollen can not come in contact with stigma of the same flower.
3. Self-incompatibility, it is a genetie mechanism were pollens are prevented from fertilizing the ovule by inhibiting pollen tube germination.
4. By-production of unisexual flowers.