question_answer 40)

  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. (a) (i) and (iv)(b) (ii), (iii) and (iv)               (c) (iii) and (iv)                  (d) (i), (iii) and (iv)

Answer:

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