Question

Complete the following chart and rewrite.

Sr.No.	Agencies	type of pollination
1	Water	....................
2	...........................	Entomophily
3	Bat	....................
4	.......................	Ornithophily

 

                                       (Or)

Explain outbreeding devices in angiospermic plants.

Answer 1

1.   Water            Hydrophily

2.   Insect           Entomophily

3.   Bat              Chiropterophily  

4.  Birds             Ornithophily 

                                          (Or)

1) Most of the Angiosperms produce bisexual flowers. Cross pollination is preferred by majority of flowering plants and they develop out breeding devices.

2) In many plants self pollination is avoided as stamens and carpels do not mature simultaneously. This
is called dichogamy.

3) In some plants, pollen grains are released much before stigma becomes receptive, this is protandry
e.g. Sunflower and in some plants, stigma becomes receptive first, this is protogyny e.g. Michelia.

4) The third device to avoid self pollination is genetic mechanism and it is called self-incompability or
self sterility, e.g. Orchids.

5) Pollen germination on the stigma of the same flower is inhibited. The fourth device is to produce
unisexual flowers. i.e. unisexuality.

6) In some plants like Castor, male and female flowers are produced on the same plant and such plants
are called monoecious. In dioecious plants like Papaya, male and female flowers are produced on
different plants. This condition prevents autogamy as well as geitonogamy while monoecious condition
prevents only autogamy.