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Q.

Red the following statements : 

(i) Organisms exhibiting external fertilization show great synchrony between the sexes and release a large number of gametes 

(ii) A major disadvantage of external fertilization is that the offspring are extremely vulnerable to predators 

(iii) In gymnosperms male gametes reach egg with the help of water as a medium 

(iv) Zygote is a vital link that ensures continuity of species between organisms of one generation and the next. 

(v) Every sexually reproducing organisms begin their life as a single-celled zygote 

Which of the above statements are correct ?

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a

(i), (ii), (iv) and (v) 

b

(i), (ii) and (iii)

c

(i), (ii), (iii) and (iv)

d

(iii), (iv) and (v) 

answer is C.

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Detailed Solution

In gymnosperms male gametes reach egg with the help of pollen tube. In gymnosperms the male gametes are non-motile except in Cycas. Gymnosperms exhibit siphonogamy.

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