Corpus luteum secretes two pregnancy hormones: progesterone and relaxin.

The edible part of a carrot is the root system. Root systems that consist mainly of a single large root are said to have a tap root; in contrast, those root systems that have many branches of similar size are said to have fibrous roots. Plants such as carrot that have a single large tap root use this large underground structure for nutrient storage.

Sperms are thought to retain fertilising capability for upto 1-3 days once they have entered the female genital tract.

The acrosome is a specialised structure that is inside the tip of the sperm cell. It is derived from the Golgi complex during the maturation of the sperm. It is basically a storage vesicle that contains hydrolytic enzymes that digest proteins and complex sugars. The contents of the acrosome are secreted once the sperm makes contact with the egg. These enzymes will break down the zona pellucida, forming a thin path that allows the sperm to approach the egg and fuse with its cytoplasm.

IUI stands for Intra Uterine Insemination.

 Melanin pigment is found in animal hemisphere of female gamete, retina and iris of eye.

 Human Telomeric sequence is: TTAGGG

Rotation of body during metamorphosis is at 90 degree in herdmania.

Trichogyne is a long hair-like receptive structure for male sperms.

It is not an hCG. It helps in the secretion and storage of milk in the mother after the birth of the young one.

 Birds are megalecithal.

A test tube baby is fertilised outside the body, but grows in a mother's womb.

It is secreted by the graffian follicles and helps in ovulation during the menstrual cycle.

A holoblastic cleavage producing blastomeres of equal size

 Eustachian tube originates from mesoderm.

Leydig's cells are present in testes and secrete male hormone testosterone.

Chlamydia is a bacterial infection disease transmitted when people have sexual relations.

The pituitary releases LH when the level of blood testosterone falls, which has positive feedback with hypothalamus and the anterior pituitary gland.

Ruminate endosperm is commonly found in the seeds of Annonaceae. 

Filliform apparatus is found in synergid.