Question

What will happen if the fallopian tubes in a female are blocked ? why does a mature human female generally bare one chid at a time ? why do eggs of birds and insects have shells? why are offsprings of oviparous animals at a greater risk of survival as compared to offsprings of viviparous animals ? fertilisation cannot be external in land animals.Why? define metamorphosis. name any 3 oviparous animals .

Answer 1

Due to blockage, sperms will not reach to egg and fertilization. There are limited amount of egg in both the ovaries. They mature one by one and are released. So only one egg is fertilized and one child is bare at a time.