Which of the following is correct about nematocyst?

• It can be re-used.

• It is excretory organ in arthropods.

• It is ejected on contact and pierce the prey.

• None of these.

272.

Assertion : Salamander, Sphenodon are classified as amphibians.

Reason : Sphenodon is regarded as living fossil.

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true

Functional systems for specific physiological functions are not seen in

• Annelids

• Molluscs

• Arthropods

• Echinoderms

• Echinoderms

Match Column I with Column II and choose the correct answer

• i - C; ii - D; iii - A; iv - B; v - E

• i - D; ii - E; iii - B; iv - C; v - A

• i - D; ii - A; iii - B; iv - E; v - C

• i - A; ii - B; iii - C; iv - D; v - E

• i - A; ii - B; iii - C; iv - D; v - E

Which of the following statement/s regarding coelenterates is/ are wrong?

I. Cnidocytes are present on the tentacles and on the body

II. Diploblastic with cellular level of organization

III. Polyp forms are free swimming

IV. Exhibits metagenesis

V. Polyps produce medusae sexually and medusae form polyps asexually

• II and IV only

• III and V only

• I, II and III only

• III only

• III only

Choose the wrong statement

• Teeth in Chondrichthyes are modified ctenoid scales

• Air bladder in fishes regulates buoyancy

• In amphibians, the tympanum represents the ear

• Long bones in birds are pneumatic

• Long bones in birds are pneumatic

Match the following and choose the correct combination from the options given.

• A - 1; B - 2; C - 3; D - 4

• A - 2; B - 3; C - 4; D - 1

• A - 4; B - 3; C - 2; D - 1

• A - 3; B - 4; C - 2; D - 1

• A - 3; B - 4; C - 2; D - 1

Flame cells of flatworms help in

(i) osmoregulation
(ii) digestion
(iii) reproduction
(iv) excretion
(v) bioluminescence

• (ii) only is correct

• (i) and (iv) are correct

• (iii) only is correct

• (i) and (v) are correct

• (i) and (v) are correct

Read the statements regarding echinoderms and choose the correct option

(1) All are marine with organ system level of organisation.

(2) Adults are bilaterally symmetrical.

(3) They are dioecious.

(4) Fertilisation is internal and indirect development is observed.

(5) Triploblastic and acoelomate animals.

• (1) and (3) are correct

• (5) alone is correct

• (1), (3) and (5) are correct

• (1) and (5) are correct

• (1) and (5) are correct

This class of animals are all ectoparasites on some fishes

• Amphibia

• Osteichthyes

• Reptilia

• Cyclostomata

• Cyclostomata