PREGNANCY AND EMBRYONIC DEVELOPMENT

Question 1

After implantation, ________ like projections appear on the ________ called _____________.

Answer 1

Finger, trophoblast, chorionic villi

Question 2

Chorionic villi are surrounded by ________ and _________

Answer 2

uterine tissue, maternal blood

Question 3

Chorionic villi and uterine tissue become ________ with each other and jointly form a structural and functional unit between ________ and ____ called ________

Answer 3

Interdigitated, developing embryo(foetus), maternal body, placenta

Question 4

Placenta facilitate the supply of ____________ to embryo and also removal of ____________ produced by it.

Answer 4

oxygen, nutrients ; carbon dioxide, excretory/waste materials

Question 5

The placenta is connected to the embryo through ____________ which helps in __________

Answer 5

an umbilical cord, transport of substances to and from embryo

Question 6

Placenta also acts as an exocrine tissue.

True/false

Answer 6

False

endocrine

Question 7

Placenta produces 4 hormones i.e. -

Answer 7

human chorionic gonadotrophin(hCG), human placental lactogen(hPL), estrogen, progestogens.

Question 8

In the later phase of pregnancy, hormone called ____________ is also secreted by the ovary.

Answer 8

Relaxin

Question 9

________________(3) hormones are produced in women only during pregnancy.

Answer 9

hCG, hPL , relaxin

Question 10

During pregnancy, levels of other hormones such as ____________(5) are increased several-folds in fetal/maternal blood.

Answer 10

Estrogen, progesterone, cortisol, thyroxin, prolactin ; maternal

Question 11

Increased production of such hormones in pregnancy is essential for ____(3)

Answer 11

Fetal growth, metabolic changes in mother, maintenance of pregnancy.

Question 12

Immediately after fertilisation, ________ differentiates into ____(no.) layers called ________.

Answer 12

Inner cell mass(embryo); 3 ; ectoderm, mesoderm, endoderm

Question 13

These layers give rise to _________

Answer 13

All tissues(organs) in adults

Question 14

What are stem cells?

Answer 14

Inner cell mass contains certain cells which have potency to give rise to all tissues and organs - called stem cells.

Question 15

Embryo heart is formed after ________(time) of pregnancy

Answer 15

1 month

Question 16

By end of 2nd month of pregnancy, foetus develops ___________

Answer 16

limbs and digits

Question 17

By end of 12 weeks(1st trimester), most of major organ systems like limbs and external genital organs are well developed.

True/false

Answer 17

True

Question 18

What is observed during the fifth month?

Answer 18

1st movements, appearance of hair on the head

Question 19

By end of 24 months(3rd trimester), body is covered with fine hair, eye-lids separate, eyelashes are formed.

True/false

Answer 19

False

2nd

Question 20

What is observed by the end of 9 months of pregnancy?

Answer 20

Foetus is fully developed and is ready for delivery