Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / guest
Pollination is the transference of pollen grains from the
anther of a flower to the stigma of the same flower or of
another flower of the same or sometimes allied species.
Pollination is of two kinds:--
(1) Self Pollination or Autogamy
(2) Cross Pollination or Allogamy
(1) Self Pollination:- Self Pollination is the transference
of pollen grains from the anther of a flower to the stgme of
the same flower or to another borne by the same plant.
It is of two kinds:-
(a)Homogamy.
(b)Cleistogamy.
(2) Crosspollination:- Crosspollination is the transference
of a pollen grains from one flower to another borne by two
separate plants of the same or allied species. In this two
parents are evolved, a mingling of two sets of characters
takes place resulting in better off spring.
Cross-pollination is brought about by some external
agencies which are as flowers:-
(1) Entomophily:- This is pollination by insects. Insect
loving plants have various adaptations by which they attract
insects, which carries pollen grains and conveys these to
other flower for pollination.
These adaptations are:
(a) Colour
(b) Nectar
(c) Scent
(2) Anemoplily:- Cross pollination in some cases is brought
by wind. Wind loving flowers are small inconspicuous. These
are not even coloured or showy. Pollens are very minute
light and dry e.g. in pine. In this pollens are provided
with wings. Examples of these are maize, rice grasses,
bamboo, sugarcane.
(3) Hydrophily:- In this case pollination is brought by
water. In vallisnaris, Hydrilla etc.. water serves as the
effective medium if pollination.
(4) Zoophily:- Bats, snails squirrels etc. also act as
agents of pollination
Advantages of cross pollination are many:-
(1) It results in healthier off spring which are better
adapted to the struggle for existence
(2) Viable seeds and abundant seed are produced.
(3) New varieties are produced.
| Is This Answer Correct ? | 5 Yes | 0 No |
Post New Answer View All Answers
In what order of insects would you find hamuli?
Will developed countries be allowed to shield some of their agricultural products from full tariff cuts?
Where is the tympanum located in the family Tettigoniidae?
What are some facts about igneous rocks? : soil science
Will india continue to have adequate policy space to raise tariffs on agricultural products even after the doha round?
Who was the first person to recognize that true flies have two wings and gave them the name ?Diptera??
What is pedology in soil? : soil science
Discuss the role of agricultural engineers in addressing food security and global challenges related to population growth and changing climates.
Did india use the special safeguard provisions available in the agreement on agriculture? Will developing countries have recourse to any emergency safeguard measures in the doha round?
How do you ensure that your engineering designs align with the specific needs and conditions of local farmers and agricultural communities?
Describe your familiarity with relevant software tools used in agricultural engineering, such as simulation programs or modeling software.
Do fungus gnats, phorid flies or moth flies bite? Are the bites toxic? If toxic, what kind of symptoms are manifested from the bite?
Will the de minimis levels of support permissible also be reduced in this round? Will this lead to india having to reduce any of its subsidies for its farmers?
What is pedogenesis? : soil science
What three mineral particles is soil composed of? : soil science
