Distinguish Between :

Question 14 Marks

Distinguish between Chordates and Nonchordates.

Answer

Chordates and Non chordates:

	Chordates	Non chordates
i.	Body is supported by notochord.	Body is not supported by notochord.
ii.	Pharyngeal gill slits are present, at least in developmental stages.	Pharyngeal gills slits are absent.
iii.	Nerve chord is hollow and present dorsally.	Nerve chord if present, is solid, paired and present ventrally.
iv.	Heart is present on the ventral side of the body.	Heart, if present, is on the dorsal side of the body.

Question 24 Marks

Distinguish between Aves and Mammalia.

Answer

	Aves	Mammalia
i.	Mammary glands are absent.	Mammary glands are present.
ii.	They are completely adapted for aerial life.	They are mostly terrestrial animals with some exceptions like dolphin, bat, etc.
iii.	Body is divided into head, neck and trunk.	Body is divided into head, neck, trunk and tail.
iv.	Exoskeleton is present in the form of feathers.	Exoskeleton is present in the form of hairs or fur.
v.	Digits are covered with scales and bear claws.	Digits are provided with nails, claws or hooves.
	e.g. Peacock, penguin, parrot, Npigeon, duck. etc.	e.g. Elephant, human, kangaroo, dolphin, bat, etc.

Question 34 Marks

Distinguish between butterfly and bat with the help of two distinguishing characteristics.

Answer

Distinguish between butterfly and bat:

	Butterfly	Bat
i.	It belongs to phylum Arthropoda.	It belongs to phylum Chordata
ii.	It has jointed appendages.	It does not have jointed appendages.
iii.	It has four wings for flying.	It has patagium that functions as a wing.
iv.	Body is divisible into head, thorax and abdomen.	Body is divisible into head, neck, trunk and tail.
v.	Exoskeleton is chitinous.	Exoskeleton is in the form of hairs.

Science Distinguish Between :