(A) (i) In an angiospermic flower, fertilization is said to take place when male gametes carried in the…
(A) (i) In an angiospermic flower, fertilization is said to take place when male gametes carried in the pollen tube fuse with the female gamete, present in the embryo sac. This results in lot of changes in different parts of the flower. State the changes taking place in the following structures of flower post fertilization :
(a) Zygote
(b) Ovule
(c) Ovary
(d) Sepals
(ii) Define germination.
Solution
(A)
(i) (a) Zygote: It divides several times to form an embryo within
the ovule.
(b) Ovule: It develops a tough coat and is gradually
converted into a seed.
(c) Ovary: Grows rapidly and ripens to form a fruit.
(d) Sepals: They shrivel and fall off.
(ii) Germination is the process when the mature seed develops
into a seedling under appropriate conditions.
OR
(B)
(i) Vegetative propagation.
(ii) Advantages: -
• Plants raised by vegetative propagation can bear flowers
and fruits earlier than those produced from seeds.
• Plants produced by vegetative propagation are genetically
similar to the parent plant.
• Plants that have lost the capacity to produce seed can 1+1
reproduce by Vegetative propagation.
(any two advantages)
(iii) Roses, grapes, banana, orange, jasmine etc.
(any other two examples) ½+½
(iv) Regeneration is carried out by specialised cells. The
organism which have those cells only can show
regeneration.
SECTION – B
Chemistry