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Solution


Q.

Which among the following statements are true for unisexual flowers

(i) They possess both stamen and pistil.
(ii) They possess either stamen or pistil.
(iii) They exhibit cross pollination.
(iv) Unisexual flowers possessing only stamens cannot produce fruits.
1 (i) and (iv)  
2 (ii), (iii) and (iv)  
3 (iii) and (iv)  
4 (i), (iii) and (iv)  

Ans.

(2)

The flowers which are unisexual (papaya, watermelon) contain either stamens or carpels. Since only one reproductive organ is present in them, they depend on cross pollination to form zygote after fertilisation. Both stamen and carpels are required for fertilisation, so only one of them cannot produce fruits.