How do organisms reproduce Worksheets

How do organisms reproduce Worksheet-16

Subjective questions:

61. Draw a diagram to show fertilisation in a flowering plant. Label on it:

(i) Stigma          (ii) Ovary           (iii) Polar nuclei  (iv) Egg

Define the term 'double fertilisation in plants'. After fertilisation name the part in each case which develops into (i) the fruit (ii) the seeds.

62. Give two reasons for avoiding frequent pregnancies of women. Explain the following methods of contraception giving one example of each:

(i) Barrier method    (ii) Chemical method         (iii) Surgical method