CLASS 12 BIOLOGY CHAPTER 2 PPT

1. CHAPTER 2 PPT
SEXUAL REPRODUCTION IN
FLOWERING PLANTS
PREPARED BY ASHA GOPALAKRISHNA

2. L.S OF A FLOWER
L.S.OF A FLOWER

3. Three dimensional cut section of an
anther

4. Anther- T.S young and mature
dehisced

5. T.S of anther young and mature

6. Microsporogenesis
PMC (2n) MICROSPORE(n)MEIOSIS

7. Pollen grain tetrad

8. POLLEN GRAINS

9. Stages of microspore maturing into a
pollen grain

10. Pollen grains-rich in nutrients

11. Diagrammatic view of anatropous
ovule

12. MEGASPOROGENESIS
MMC(2n) MEGASPORE(n)
MEIOSIS

13. Megasporogenesis

15. Differences between
microsporogenesis and
megasporogenesis
MICROSPOROGENESIS MEGASPOROGENESIS
1. The formation of microspore from
pollen mother cell by meiosis
1. The formation of megaspore from
megaspore mother cell by meiosis
2. It takes place in anther 2. It takes place in ovule of ovary
3. Four functional microspores are
produced.
3. Only one functional megasore is
produced.

16. Embryo sac( FEMALE GAMETOPHYTE)(n)
CHALAZAL END
MICROPYLAR END
(n)
(n)
(n)
(n)

17. SELF INCOMPATIBILITY TO PREVENT SELF POLLINATION

18. Entry of pollen tube into an ovule
Chalazal end
Micropylar
end

20. Discharge of gametes into synergids

22. TRIPLE FUSION (n+n+n)
SYNGAMY

25. Dicot and monocot embryo

28. Emasculation-removal of anthers from
the flower bud before the dehiscence
of anther

29. Bagging-covering of emasculated
flowers with a bag

31. False fruits of apple and strawberry
thalamus
seed