Zoology XII - Animalia - General Account and Non-chordates including Protozoa 06

Question : 1

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Which of the following statement is wrong for the given animal in diagram?

Options:

	Skeleton consists of siliceous spicules
	Fertilisation is internal and indirect development
	It is primitive multicellular animal having cellular level of organization
	It is generally marine

Solution :

Spongilla is fresh water sponge.

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Question : 2

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Which of the following cell lines the spongocoel and canals in sponges?

Options:

	Collar cells
	Choanocytes
	Archaeocytes
	Both (a) & (b)

Solution :

In sponges, choanocytes lines the
spongocoel and canal.

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Question : 3

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Most of sponges are

Options:

	Radially symmetrical
	Bilaterally symmetrical
	Biradially symmetrical
	Asymmetrical

Solution :

Most of sponges are asymmetrical that

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Question : 4

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Which type of cells are capable of giving rise to other types of cells in sponges?

Options:

	Chonocytes
	Archaeocytes
	Myocytes
	Thesocytes

Solution :

Archaeocytes are the totipotent cells of
sponges.

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Question : 5

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Given below are some cells in a box which are present in animals

How many of them are not present in sponges?

Options:

	One
	Two
	Three
	Four

Solution :

Cnidoblast and osteocytes are not present
in sponges.

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Question : 6

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Which of the following cell of sponges stores reserve food material in the form of glycogen?

Options:

	Thesocytes
	Chromocytes
	Trophocytes
	Archaeocytes

Solution :

Thesocytes store food in food granules.

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Question : 7

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Spicules are present in

Options:

	Sycon
	Sycon and Euspongia
	Euspongia
	Paramoecium

Solution :

In Euspongia, skeleton is made up of
spongin fibers only.

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Question : 8

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In unfavourable condition some of the sponges undergo internal budding called as gemmule formation. Gemmule of sponges contains.

Options:

	Pinacocytes
	Thesocytes
	Choanocytes
	Archaeocytes

Solution :

Archaeocytes are the totipotent cells. Each
gemmule has a mass of archaeocytes
surrounded by protective covering to tide
over seasonal drought or adverse
environmental conditions.

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Question : 9

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Digestion in sponges is

Options:

	Only intracellular
	Only extracellular
	Intracellular followed by extracellular
	Extracellular followed by intracellular

Solution :

Digestion in sponges is intracellular and
takes place in collar cells.

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Question : 10

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In sponges, ___A___ catch the food and ___B___ regulates the diameter of osculum. Choose the option which correctly fills up the blanks labelled as a and b

Options:

	A
	B
	C
	D

Solution :

Diameter of osculum is regulated by
myocytes.