Question

Which structures are found in a human egg cell?

	Cell membrane	Cell wall	Haploid nucleus
A.	✓	X	X
B.	✓	X	✓
C.	✓	✓	✓
D.	X	✓	✓

A)A
B)B
C)C
D)D

Answer 1

Hint: Egg cells are sometimes referred to as ova (singular ovum, from the Latin word ovum meaning 'egg') in animals. In mammals, the word ovule is used for an animal's young ovum. In vertebrates, female gonads (sex glands) called ovaries to develop ova. A number of ovaries are present in mammals at birth and mature through oogenesis.

Complete answer:
The ova forms defensive layers in the oviparous animals (all birds, most fish, amphibians and reptiles) and moves out of the body via the oviduct. They are fertilized either inside the female body (as in birds), or outside the female body by male sperm (as in many fish). An embryo forms after fertilization, nourished by nutrients found in the egg. It then hatches out of the embryo, beyond the body of the mother. For a discussion of oviparous animal embryos, see the egg.

The cytoplasm and mitochondria of the egg cell are the sole means that the egg will replicate by mitosis after fertilization and ultimately form a blastocyst. The correct answer is option b. Although the animal cell does not contain the cell wall, it is absent in the egg cell where it is present as a semi-permeable cell membrane. The reproductive cells of egg cells comprise one set of chromosomes and are thus haploid.

Hence, the correct answer is option (B)

Note: Ovoviviparity- The ovoviviparous species are an intermediate form: the embryo develops inside and is fed by an egg as in the oviparous example, but then it hatches inside the body of the mother just before birth, or only after the egg leaves the body of the mother. This technique is used by some fish, reptiles and many invertebrates