3. Many Evidences have been Given to prove that
Flower Is modified shoot are
• 1st Point :-
• Position Of Flower bud & shoot bud is same in
Plant, both are terminal & axillary in Position
• 2nd Point :-
• In Some Plants Flower bud
modified into vegetative Bud
4. 3rd Point :-
• In Some Plants
Thalamus
elongate to form
vegetative branch
above the first flower
• Ex. :- Rose
27. Pollination
1. Self Pollination
a. Autogamy
b. Geitonogamy
Contrivances for self pollination
i. Homogamy
ii. Cleistogamy
2. Cross Pollination
Contrivances for cross pollination
i. Self sterility or self incompatibility
ii. Dichogamy
iii. Herkogamy
iv. Heterostyly
29. Agencies of pollination
1. Abiotic agents:
(a) Anemophily
(b) Hydrophily
i. Hypo-hydrophily
ii. Epi-hydrophily
2. Biotic agents:
(a) Entomophily (b) Ornithophily
(c) Cheiropteriphily (d) Malacophily
3. Artificial Pollination
40. Endosperm
• Polar Nuclei + Male gamete = Triple fusion
• Result is Prim. Endosperm Nucleus, dev. into
endosperm
• Highly nutritive tissue provides nourishment to
developing embryo.
• Endospermic & non endospermic seeds
• Usually triploid (3n) but in Oenothera (2n) & in
Peperomia (9n)
• Three types 1. Nuclear 2. Cellular & 3. Helobial
