Zoology XII - Animalia - General Account and Non-chordates including Protozoa 03

Question : 1

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Which is not true w.r.t Entamoeba histolytica?

Options:

	Monopodial
	Holozoic nutrition
	Monogenetic
	Single contractile vacuole

Solution :

Contractile vacuole is absent as there is no
need of osmoregulation.

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Question : 2

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The below diagram represents few stages in life cycle of Entamoeba histolytica

Options:

	A – Trophozoite B – Chromatoid Bodies C – Quadrinucleate cyst D – Metacystic amoeba
	A – Minuta B – Nucleus C – Metacystic amoeba D – Quadrinucleate cyst
	A – Precystic Amoeba B – Food vacuole C – Excystic amoeba D – Quadrinucleate magna
	A – Magna B – Chromatoid Bodies C – Metacystic amoebulae D – Quadrinucleated magna

Solution :

A – Trophozoite/Magna
B – Chromatoid bodies (ribonucleoprotein)
C – Metacystic amoeba
D – Amoebulae

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Question : 3

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Which is the infective stage of Entamoeba histolytica?

Options:

	Trophozoite
	Binucleate cyst
	Tetranucleate cyst
	Magna form

Solution :

Tetranucleate cyst (minuta form) is infectious stage and trophozoite/magna form is pathogenic

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Question : 4

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Entamoeba infection spreads by

Options:

	Mosquito
	Bedbugs
	Rats
	Houseflies

Solution :

Houseflies sitting on faecal matter of host containing tetranucleated cyst may transfer them to food stuffs.

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Question : 5

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Which stage of E. histolytica is responsible for abdominal pain, repeated motions, ulceration i.e amoebic dysentry/amoebiasis?

Options:

	Binucleate cyst
	Tetranucleate cyst
	Metacystic form
	Magna form

Solution :

Magna form resides in the mucosa and submucosa of upper part of human large intestine and is pathogenic stage.

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Question : 6

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Bottom dwellers, marine or fresh water sarcodines which possess a calcareous shell having one or more chambers, reproduce by binary and multiple fission are

Options:

	Foraminiferans
	Radiolarians
	Heliozoans
	Rhizopods

Solution :

Foraminiferans and radiolarians possess calcareous shell; sarcodines possess siliceous shell. But radiolarians are exclusively marine.

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Question : 7

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_______ ooze is the deposit of skeleton of organisms which are put to commercial use like diatomaceous earth as filtering agent and for rubbing

Options:

	Radiolarian
	Foraminiferans
	Actinophrys
	Heliozoans

Solution :

Radiolarian ooze is the deposit of radiolarian skeleton which is put to commercial use.

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Question : 8

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Options:

	a
	b
	c
	d

Solution :

Amoeba possess lobopodia. Pseudopodia at forward end of Amoebe gets its form consistency by hyaline cap. And Amoeba show movement by change in viscosity of fluid i.e., sol to gel and vice versa.

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Question : 9

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Which of the following methods is involved in the ingestion of active prey by food cup formation?

Options:

	Import
	Invagination
	Circumfluence
	Circumvallation

Solution :

Import – food sinks passively Circumfluence – food is passive Invagination – food is invaginated into tube.

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Question : 10

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Which organelle in Amoeba regulates osmotic pressure and it harmonizes the tension between protoplasm and the surrounding water?

Options:

	Nucleus
	Non contractile vacuole
	Contractile vacuole
	Food vacuole

Solution :

Rhythmic contraction and relaxation of contractile vacuole serve the purpose of excretion and osmoregulation.