In this phase corpus luteum secretes progesterone which prepares the endometrium for the implantation of an embryo.

It is the merging of the nuclei of the sperm and egg cells resulting in fertilisation.

It is a hormone which is detected during pregnancy test and produced by the syncytiotrophoblast, a portion of the placenta.

It is the covering of heart called the pericardium, and the membrane that surrounds the lungs is called the pleura. It is produced by mesoderm.

It is the test used to detect the sex of the foetus.

It is a small sac that pushes out from the gut of embryo near the yolk sac.

It is the fluid that surrounds the baby in the uterus during pregnancy which protect the foetus and allows the fetal movements.

In human beings, during the fourth week after fertilisation, the embryo develops a simple heart.

It is the membrane that exists during pregnancy between the developing foetus and the mother.

Passive immunity is also provided through the transfer of IgA antibodies found in clostrum that are transferred to the gut of the infant, protecting against bacterial infections.

The best known and most abundant steroid in the body is cholesterol. Cholesterol is formed in the brain tissue, nerve tissue. It is also used for transformation.

In our body, antibodies are in the form of glycoprotein, which are also called immunoglobulins. They are produced by the lymphocytes in response of antigen.

Water is a polar molecule and lipids are non-polar, i.e. shy lipids cannot be soluble in water. In other words, lipids are hydrophobic in nature.

The basic structure of tRNA assumes the pattern of clover leaf that carry amino acids to the ribosome for polymerisation into a polypeptide.

Packaging of genes in bacterial cells is done by basic proteins, e.g. HU protein.

PKK Nair is known as the father of Indian palynology.

He gave the statement 'ontogeny repeats phylogeny'.

Pellagra is caused due to the deficiency of vitamin B₃.

Black wart disease of potatoes is caused by Synchytrium endobioticum.

It is the larva of mosquito.