Zoology XII+ - Human Reproduction 14

Question : 1

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Mark the region that jointly make structural and functional unit between developing embryo and maternal body

Options:

	Umbilical cord
	Placenta
	Extra-embryonic membranes
	Uterine wall

Solution :

(2)

Chorionic villi and uterine tissue become interdigitated with each other and jointly form placenta.

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Question : 2

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Mark the type of placenta in which erosion of maternal parts like uterine mucosa including epithelium, connective tissue and endothelium occur

Options:

	Syndesmochorial
	Haemochorial
	Haemoendothelial
	Epitheliochorial

Solution :

(2)

In this placenta blood is in contact with trophoblast of foetus.

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Question : 3

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In human foetus, CO₂ of foetus blood crosses how many barriers of placenta?

Options:

	3
	4
	2
	1

Solution :

(1)

Humans have haemochorial placenta.

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Question : 4

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Decidua which does not take part in the formation of maternal part of placenta is

Options:

	Decidua basalis
	Decidua parietalis
	Decidua capsularis
	Both (2) & (3)

Solution :

(4)

Decidua basalis form a part of placenta where chorionic villi are inserted.

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Question : 5

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On the basis of distribution of villi, placenta in early stage of development in humans are

Options:

	Discoidal
	Diffuse
	Zonary
	Metadiscoidal

Solution :

(2)

In humans at early stages of development villi are present all over the surface (diffused) but later on restricted to small disc (discoidal) such placenta with early diffused and later discoidal villi are metadiscoidal. Zonary placenta is restricted to small girdle and is a characteristic of carnivores.

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Question : 6

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Placenta is the largest temporary endocrine gland which produces both steroid and protein hormones. Which of the following hormone is produced by placenta only?

Options:

	Estrogen
	Progesterone
	HCG
	Oxytocin

Solution :

(3)

HCG is only produced by placenta. Estrogen and progesterone can be produced by ovary. Oxytocin is produced by hypothalamus.

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Question : 7

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Which of the following cannot be taken as the function of placenta?

Options:

	Storage of glycogen and fats
	Nutrition and oxygen transport to foetus
	Release of oxytocin during parturition
	Excretory functions of foetus

Solution :

(3)

Oxytocin is released by posterior pituitary of mother during parturition.

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Question : 8

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During pregnancy placenta show increase in the level of different hormones in the maternal blood. Increased production of these hormones is essential for all, except

Options:

	Supporting faetal growth
	Bringing metabolic changes in the mother
	Maintenance of pregnancy
	Increase morphogenetic movements of blastomeres for early growth and development of foetus

Solution :

(4)

These hormones does not increase morphogenetic movement to increase development. This process go with its own pace.

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Question : 9

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Umbilical cord connect foetus to placenta. It consists of blood vessels wraped in connective tissue. This cord carries

            Artery                         Vein

(1)  1 (Oxygenated)              1(Deoxygenated)
(2)  2 (Deoxygenated)          1 (Oxygenated)
(3)  1 (Oxygenated)              2 (Deoxygenated)
(4)  2 (Deoxygenated)          2 (Oxygenated)

Options:

	1
	2
	3
	4

Solution :

(2)

Umbilical cord has three blood vessels i.e., 2 arteries carrying deoxygenated blood and 1 vein carrying oxygenated blood.

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Question : 10

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Placenta in humans is formed of

Options:

	Chorion + Yolk sac
	Chorion + Allantois
	Yolk sac + Allantois
	Chorion only

Solution :

(4)

In case of mammals the most common type of placenta is chorioallantoic whereas in humans it is only chorionic.