1. Revision Biology Pollination & Fertilization IX Std
Dr. Pramila Kudva

2. Agents of cross pollination 4. pollinated by elephants
Across
4. pollinated by elephants
Down
1. pollinated by insects
2. pollinated by water
3. pollinated by wind
5. pollinated by birds

3. 2. structural barriers for pollination
Across
2. structural barriers for pollination
4. anthers mature early
7. anthers and styles are located at different levels
 Down
1. cross pollination
3. self pollination where pollen is deposited on the stigma of a different flower
4. stigma matures early
5. Self pollination
6. different maturation time for the anthers and style

4. 1. Draw the pollen as shown below and neatly label the parts5 2 4 3

5. 2. Draw the mature ovule and label the parts.1 2
3 a 4 7
3 b 6 5

6. Name the changes in the part of the flower after fertilization.
Ovary
Ovary Wall
Ovule
Placenta
Integuments
Secondary nucleus
Egg Cell

7. Slide 1 Answers:
Across
4 – Elephophilous
Down
Entomophilous
Hydrophilous
Anemophilous
5. Ornithophilous
Slide 3 Answers:
Antipodal cells
Polar nuclei
a & b – Integuments
Egg cell
Micropyle
Synergids
7. Embryo sac
Slide 2 Answers:
1 – Pit
2 – Exine
3 – intine
4 –Pollen tube nucleus
5 – Generative nucleus

8. Slide 4 Answers:
Antipodal cells
Polar nuclei
a & b – Integuments
Egg cell
Micropyle
Synergids
7. Embryo sac
Slide 5 Answers:
1.Fruit
2, Pericarp
3. Seed
4. Stalk of the seed
5. Seed coat
6. Endosperm [Food storing tissue]
7. Zygote

9. 1. What is Triple fusion
Ans: two polar nuclei [2N] unite to form a seccondary nucleus and this unites with the sperm cell [1N] to form the endosperm [3 N].
2. What is the function of the following:
a) Endosperm
Ans: It provides nutrition to the seed. It contains protein and starch
b) Tube of the pollen
Ans: To take the male gametes to the embryo sac

10. 3. What is double fertilization
3. What is double fertilization? Ans: a) Egg cell unites with a male gamete / Sperm Cell [2 N] – Forms the Zygote b) 2 Polar Nuclei fuse with one male gamete /sperm cell [3 N] – Forms the Endosperm Nucleus / Secondary nucleus

11. 4. Name the following:
A) The nourishing liquid that holds the seeds
Ans: Placenta
b) Different maturation time of the androecium and gynoecium
Ans: dichogamy
c) Anthers mature earlier
Ans: Protandry
d) Stigma matures earlier
Ans: Protogyny

12. e) Mechanical barrier that favours cross pollination Ans: Herkogamy f) Anthers and stigma grow at different heights Ans: Heterostyly

13. 5. What is the difference between Autogamy and Geitonogamy?
Autogamy is pollination in the same flower
Geitonogamy is pollination between the flowers of the same plant but different flowers.

14. 6. In which pollination do you find a) Floating Pollen Ans: Hydrophilous b) Stigma hanging outside the flower Ans: Anemophilous c) Flowers with nectar Ans: Entomophilous

15. d) Large flowers on the ground Ans: Elephophilous e) Bright flowers without nectar Ans: Ornithophilous

16. Give one word for the following
Give one word for the following. A) Pollen grain of the flower fail to fertilize the egg cell of the same flower. Ans: Self sterility B) Grooves on the petals that lead to nectaries Ans: Honey guides or nectary guides C) Transference of pollen to the stigma of a different flower on the same plant Ans: Geitonogamy