Which among these is the correct combination of aquatic mammals?

• Seals, Dolphins, Sharks

• Dolphins, Seals, Trygon

• Whales, Dolphins, Seals

• Whales, Dolphins, Seals

An important characteristic that Hemichordates share with Chordates is

• Absence of notochord

• Ventral tubular nerve cord

• Pharynx with gill slits

• Pharynx with gill slits

Which one of these animals is not a homeotherm?

• Macropus

• Chelone

• Psittacula

• Camelus

54.

Which of the following features is used to identify a male cockroach from a female cockroach?

• Presence of a boat-shaped sternum on the 9th abdominal segment

• Presence of caudal styles

• Presence of anal cerci

• Forewings with darker tegmina

Which of the following animals does not undergo metamorphosis?

• Earthworm

• Tunicate

• Starfish

• Moth

Torsion of visceral mass is seen in animals belonging to the class

• Cephalopoda

• Scaphopoda

• Amphineura

• Gastropoda

Match the following columns.

• A	B	C	D
  3	2	4	1

• A	B	C	D
  2	3	4	1

• A	B	C	D
  4	3	1	2

• A	B	C	D
  1	4	2	3

Organ of Jacobson helps in

• Touch

• Vision

• Smell

• Hearing

Notochord originates from

• Mesoderm

• Ectoderm

• Endoderm

• None of these

Which of the given option is correct regarding the statements?

Statement I: Cephalochordata bears notochord all along the body throughout life.

Statements II: Urochordate bears vertebral column only in the tail region throughout the life.

• I wrong, II correct

• I correct, II wrong

• Both I and II are wrong

• Both are correct