BIOLOGY 1 Marks Question

Before birth at five months of foetal life, oogonia reach their maximum number.

Seminal plasma (secreted by the male reproductive glands) along with the spermatozoa, constitute semen.

Fertilisation takes place in Fallopian tube (W) and implantation takes place in uterus (Y).

The first sign of growing foetus is noticed by listening to the heart sounds through a stethoscope.

In this phase, progesterone stimulates the endometrial glands of the uterus to secrete a nutrient fluid for the foetus hence, also called the secretory phase.

S. No.	Column I	S. No.	Column II
A.	Acrosome	4.	Contains enzymes to dissolve egg envelopes.
B.	Head	3.	Contains the genetic material.
C.	Tail	1.	Motility of sperm towards the egg.
D.	Middle piece	2.	Powerhouse of the sperm; contains a number of mitochondria.

Colostrum.

Perimetrium, Myometrium and Endometrium.

40 chromosomes.

Ciliated epithelial tissue.

If the testes fail to descend to the scrotum, gametogenesis could be inhibited. The process of spermatogenesis requires a marginally lesser ambient temperature than that in the abdominal cavity.

Trophoblast is the outer layer of blastocyst which helps in the attachment of blastocyst to the endometrium of the uterus.

Chorionic villi appear after implantation on the trophoblast. It becomes interdigitated with uterine tissue to form the placenta and increases the surface area for exchange of materials between the mother and the embryo.

First cleavage division of zygote occurs in the ampullary-isthmic junction in the female reproductive tract.

During the production of secondary oocyte and ovum.

These are mild uterine contraction induced by the signals for parturition originated from fully developed foetus and placenta.

The primary oocyte within the tertiary follicle grows in size and completes its first meiotic division to form secondary oocyte and first polar body.

Yes. For example, the external reproductive organ penis in males and clitoris in females.

Endometrium.

During pregnancy, placenta produces hormones like human chorionic gonadotropin and human placental lactogen and ovary produces relaxin.

Sertoli cells. They are found on the inner lining of seminiferous tubule.

Because eggs are non-motile (stationary) and sperms have to travel up to eggs.

1. Isthmus.
2. Ampulla.

Leydig cells are present in the regions called interstitial spaces outside the seminiferous tubules. They synthesise and secrete androgens (testosterone).

Sperms swim by vibrating their tail in the fluid while eggs do not require it.

The follicle cells that envelope the egg outside zona pellucida are called corona radiata.

Luteal phase/ Secretory phase.

Blastocyst stage.

It is the innermost glandular layer of uterus which lines the uterine cavity. Here, implantation of blastocyst takes place. It undergoes cyclical changes during menstrual cycle.

Spermiogenesis: It is the transformation of spermatids into spermatozoa or sperms.
Spermiation: It is the release of sperms from seminiferous tubules.

The secretions of the bulbourethral glands help in the lubrication of the penis.

400 sperms and 100 ova.

Ovulation.

60,000-80,000 primary follicles are left in each ovary.

Labia minora.

Amniotic fluid.

Testosterone.

Endometrium.

Luteinizing hormone.

S. No.	Column I	S. No.	Column II
A.	Cleavage	2.	Mitotic divisions of the zygote in quick succession.
B.	Implantation	3.	Embedding of the blastocyst in the endometrium of uterus.
C.	Inner cell mass	5.	Group of cells attached to one end of trophoblast that differentiate into embryo proper.
D.	Trophoblast	1.	Outer layer of the blastocyst that attaches to the endometrium during implantation.

200 sperms.

The correct order is Mammary tubules → Mammary duct Mammary ampulla Lactiferous duct.

Oogenesis in human females initiate at the foetal/ embryonic stage.
Spermatogenesis in human males starts at puberty.

It is the remaining part of Graafian follicle after ovulation in the luteal phase which acts as an endocrine gland.

Spermiation.

Ampulla.

Epididymis.

Colostrum contains necessary antibodies (IgA and IgG) that provide protection against diseases to newborn infants.

Inner cell mass.

1. Mesoderm.
2. Endoderm.