Solution- Sexual Reproduction in Flowering Plants Test -2 Class 12 Notes | EduRev

Class 12 : Solution- Sexual Reproduction in Flowering Plants Test -2 Class 12 Notes | EduRev

 Page 1


CBSE TEST PAPER-03 
CLASS - XII BIOLOGY (Sexual Reproduction in Flowering Plants) 
 (Answer Key) 
1. Fertilization or fusion in the female gametophyte happens at two cites: the egg cell and
the generative cell; the vegetative cell and the polar nuclei. This is referred to as double
fertilization.
2. The exine of the pollen grain is composed of a highly resistant organic chemical called
sporopollenin.
3. Water pollinated: Vallisneria and Hydrilla.
Bat pollinated:   Anthocephalous and Bauhinia megalandra.
4. The zygote divides only after certain amount of endosperm is formed as it is an
adaptation to provide assured nutrition to the developing embryo.
5. Polyembryony is the phenomenon of formation of more than one embryo during the
development of seed.
6. The characteristics of an entomophilous flower include:
- Petal and sepals well developed with attractive colours to invite insects.
-Flowers are normally bigger in size with strong odour.
7. 
 Chasmogamous flower.  Cleistogamous flower. 
1. The flowers are conspicuous. The
anthers and the stigmas are exposed. 
1. The flowers are small and inconspicuous.
The anthers and stigmas are never 
exposed. 
2. Both self and cross pollination can
occur. 
2. Only self pollination is possible.
8. In xenogamy pollens from a different plant of the same species pollinate the stigma and
thus ensure the arrival of genetically different types of pollen grains on to the stigma.
Page 2


CBSE TEST PAPER-03 
CLASS - XII BIOLOGY (Sexual Reproduction in Flowering Plants) 
 (Answer Key) 
1. Fertilization or fusion in the female gametophyte happens at two cites: the egg cell and
the generative cell; the vegetative cell and the polar nuclei. This is referred to as double
fertilization.
2. The exine of the pollen grain is composed of a highly resistant organic chemical called
sporopollenin.
3. Water pollinated: Vallisneria and Hydrilla.
Bat pollinated:   Anthocephalous and Bauhinia megalandra.
4. The zygote divides only after certain amount of endosperm is formed as it is an
adaptation to provide assured nutrition to the developing embryo.
5. Polyembryony is the phenomenon of formation of more than one embryo during the
development of seed.
6. The characteristics of an entomophilous flower include:
- Petal and sepals well developed with attractive colours to invite insects.
-Flowers are normally bigger in size with strong odour.
7. 
 Chasmogamous flower.  Cleistogamous flower. 
1. The flowers are conspicuous. The
anthers and the stigmas are exposed. 
1. The flowers are small and inconspicuous.
The anthers and stigmas are never 
exposed. 
2. Both self and cross pollination can
occur. 
2. Only self pollination is possible.
8. In xenogamy pollens from a different plant of the same species pollinate the stigma and
thus ensure the arrival of genetically different types of pollen grains on to the stigma.
9. There exists a relationship between moth and Yucca plant. The moth deposits its egg in
the locule of the ovary and in turn pollinates the flower of the plant. The larvae develop
from the eggs as the seeds start developing.
10. -The pollen grain is normally spherical with two wall layers.
- the outer layer is exine composed of highly resistant organic substance called
sporopollenin which is absent at the aperture region called germ pore.
- the inner layer is the intine which is composed of cellulose and pectin.
- a mature pollen grain has a vegetative cell and a generative cell.
11. The significance or the importance of seed formation:
- seed formation is associated with pollination and fertilization that are independent of
water and therefore more dependable process.
- it provides protection and nutrition to the developing embryo.
- seeds are means of multiplication of higher plants.Being capable of perennation, it can
withstand variable climate.
12. Advantages of sexual incompatibility:
-it prevents self pollination.
- it has made plants outbreeders and this maintain vigour and vitality of the race.
- variations appear due to outbreeding provide adaptability to the changes in the
environment.
13. The embryo develops at the micropylar end where the zygote is located. The zygote starts
developing only after certain amount of endosperm is formed to assure nutrition to the
embryo. The zygote divides mitotically to form various stages including pro- embryo,
globular, heart shaped and finally the mature embryo
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