POST FERTLISATION: STRUCTURE AND EVENTS
SOLVED WORKSHEET 4
1. Name the part of flower that contribute to fruit formation in strawberry and guava respectively.
Ans:
(i) In strawberry, the fruit develops from the ovary, other floral parts degenerate and fall off Thalamus also contributes to fruit formation.
(ii) Guava, the wall of ovary develops into the wall of fruit called pericarp.
2. Banana is a true fruit but is also a parthenocarpic fruit. Give reason?
Ans: The fruit of banana is formed from the ovary, so it is a true fruit. It is a parthenocarpic fruit because the ovary develops into fruit without fertilisation and is thus, seedless.
3. Why is apple referred to as a false fruit?
Ans: In apple, the Thalamus also contributes to fruit formation. So, apples are called false fruits.
4. List the post fertilisation events in angiosperms.
Ans: The post fertilisation events in angiosperms are:
(i) Endosperm and embryo development
(ii) Maturation of ovule into seed
(iii) Maturation of ovary into fruit.
5. What is Apomixis?
Ans: The phenomenon in which seeds are produced without fertilisation is called apromixis or Agamospermy. e.g. Grass.
6. What is Parthenocarpy?
Ans: It is a commercially important process in which seedless fruit is formed without fertilisation. e.g. Banana.
7. What is Polyembryony?
Ans: The occurrence of more than one embryo in a seed in known as Polyembryony. e.g. Orange.
8. What is the meaning of Xenogamy?
Ans: Xenogamy is transfer of pollen grains from anther of one flower to stigma of another flower of a different plant.
9. What is Geitonogamy?
Ans: Geitonogamy is transfer of pollen grains from anther of one flower to stigma of another flower on same plant.
10. Name the part of the flower which the tassels of corn cob represent.
Ans: The part of the flower that represent the tassels of corn cob are stamens or male reproductive parts.
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