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4

Anticoagulant secreted by leech is

A. Hirudin

B. Heparin

C. Haematin

D. Haemozoin

Correct Answer :

A. Hirudin


Related Questions

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In earthworm fertilisation occurs in

A. oviduct

B. water

C. cocoon

D. ootheca

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Chetae are totally absent in

A. Nereis

B. Hirudinaria

C. Heteroneresis

D. Pheretima

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The excretory organs of earthworm are

A. kidneys

B. solenocytes

C. nephridia

D. green glands

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The coelom in Pherethna is

A. continuous throughout

B. continuous throughout except in first 26 segments

C. continuous only in first four segments

D. divided into a number of compartments throughout

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Earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton due to

A. setae

B. circular muscles

C. coelomic fluid

D. longitudinal muscles

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In earthworm testes are situated in the

A. 10th and 11th segments

B. 11th and 12th segments

C. 14th and 15th segments

D. none of these

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In earthworm, the nephridia without neprostomes are

A. pharyngeal

B. integumentary

C. both (a) and (b)

D. none of these

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4

In the blood vascular system of earthworm there are four pairs of hearts present in the first 13 segments. These are situated in the segments

A. 7th, 8 th, 9th and 10th

B. 8th, 10th, 12th and 15th

C. 8th, 9th, 12th and 13th

D. 7th, 9th, 12th and 13th

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4

Totally marine annelids belong to the

A. oligochaeta

B. polychaeta

C. hirudinea

D. archainnelida

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The direction of blood flow in the dorsal vessel of earthworm is

A. from the posterior to the anterior end

B. from the anterior end to the posterior end

C. from dorsal vessel to ventral vessel

D. alternately in both directions (a) and (b)

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A chitinous lining in earthworm is found in

A. pharynx

B. stomach

C. typholsole

D. gizzard

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In earthworm, the septal nephridia put their excretory discharge into

A. intestine

B. blood

C. coelom

D. gizzard

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The terminal nephridial ducts of the septal nephridia of Pheretima open into

A. each intersegmental septum

B. septal excretory canal

C. lumen of the intestine

D. supra-intestinal excretory ducts

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4

Structure typically represented in every segment of earthworm is

A. ovary

B. chloragogen cell

C. testes

D. ganglia

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Earthworms do not have any respiratory organs because

A. they do not need them

B. they are burrowing in habit

C. there is no sufficient space for such organs

D. the surface acts as an absorptive area which is larger than the volume

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The coelomic fluid in earthworm escapes through

A. dorsal pores

B. coelomic pores

C. nephridial pores

D. anus

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In earthworm, the first segment in which mouth is situated is known as

A. prostomium

B. peristomium

C. stomium

D. protostomium

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Role of typhlosole in the intestine of earthworm is

A. to kill bacteria

B. to increase absorptive surface

C. to produce digestive enzymes

D. to control blood flow

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The nitrogenous waste in earthworm consist of about

A. 40% urea and 40% uric acid

B. 50% urea and 40% ammonia

C. 40% ammonia and 20% amino acids

D. 60% ammonia and 20% amino acids

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5. The pre-typhlosolar region in Pheretima extends from

A. fifth to twenty-sixth segment

B. first to twenty-sixth segment

C. fifteenth to twenty-sixth segment

D. immediately after clitellar region to twenty sixth segment

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Which region in earthworm is the forest of nephridia ?

A. Pharyngeal region

B. Clitellar region

C. Intestinal region

D. Typhlosolar region

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The chloragogen cells of earthworm are analogous to

A. liver of invertebrates

B. liver of vertebrates

C. kidney of vertebrates

D. uriniferous tubules of vertebrates

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Annelids show advancement over the nematoda in having

A. metameric segmentation

B. true coelom

C. closed circulatory system

D. all of these

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The cliteilum singulum in earthworm is formed by

A. 12,13 and 14 segments

B. 13,14 and 15 segments

C. 14,15 and 16 segments

D. 16,17 and 1&segments

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The dorsal blood vessel in earthworm is

A. distributive in 1-13 segments

B. collective in 1-13

C. completely distributive

D. completely collective

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Earthworm is useful because it

A. helps in fixing atmospheric nitrogen

B. helps in making the land porous

C. kills harmful bacteria of the soil

D. helps in making the land fertile by turning it upside down

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In earthworm, the genital papillae are situated ventrally on segments

A. 17

B. 18

C. 19 and 22

D. 17 and 19

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The gizzard of earthworm is an organ of

A. secretion of slime

B. excretion

C. absorption of digested food

D. crushing the food

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Nephrostomes are found in

A. integumentary nephridia

B. septal nephridia

C. pharyngeal nephridia

D. none of these

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The fertilization in earthworms occurs in

A. oviduct

B. spermatheca

C. cocoon

D. clitellum