State whether the following statements are True or False. If false, correct the statement:​
(a) External fertilisation can occur both in water and on land.​
(b) The eggs of fish are covered by hard shells of protection.
(c) Human egg has a head, middle piece and tail.
(d) In adult human females, a single mature egg is released into an oviduct every month.

(a) External fertilisation can occur both in water and on land – False​
Correct statement: External fertilisation occurs only in water.​
External fertilisation is the fusion of the gametes outside the parent body. Male and female gametes are released into the water and fertilise to form a zygote.

(b) The eggs of fish are covered by hard shells of protection. False​
Correct statement: The eggs of reptiles are covered by hard shells for protection.​
The lower aquatic vertebrate animals like fish and amphibians release gametes in the water where these fertilize to form the zygote. ​
Fsh release unfertilised gametes in a group covered in a gelatinous jelly.​

(c) The human egg has a head, middle piece and tail – False​
Correct statement: Human sperm has a head, middle piece and tail.​
Sperm is a small elongated cell with a head containing nucleus, middle piece with mitochondria and a tail. An ovum is a large spherical cell released by the ovary into oviducts for fertilisation.​

(d) In adult human females, single mature egg is released into an oviduct every month - True​
The human ovary releases an egg every ​
month into the fallopian tubes which ​
either gets fertilised by a sperm or gets disintegrated and is washed out of the ​
uterus along with the endometrial lining prepared for the fertilisation. ​