Question

 Which among these is the correct combination of aquatic mammals? [NEET 2017]

(a)Seals, Dolphins, Sharks

(b) Dolphins, Seals, Trygon

(c) Whales, Dolphins, Seals

(d) Trygon, Whales, Seals

Answer/Explanation

Ans. (c)

Among the given options, option(c) contains all aquatic mammals. Whales are inhabitants of the open sea, while seal (Phoca) is a marine carnivore.
Dolphins are found in rivers. Trygon and sharks are fishes, which belong to chondrichthyes class of superclass-Pisces.

Question

 Which one of the following characteristics is not shared by birds and mammals? [NEET 2016, Phase I]

(a) Breathing using lungs

(b) Viviparity

(c) Warm blooded nature

(d) Ossified endoskeleton

Answer/Explanation

Ans. (b)

Mammals are viviparous while birds are oviparous. Viviparous means giving birth to offspring that develops within the mother’s body. Oviparous means producing eggs that hatch outside the body of mother. 

Question

Compared to those of humans, the erythrocytes in frog are [CBSE AIPMT 2012]

(a) without nucleus but with haemoglobin

(b) nucleated and with haemoglobin

(c) very much smaller and fewer

(d) nucleated and without haemoglobin

Answer/Explanation

Ans. (b)

RBCs or erythrocytes of frog are oval, disc-like biconvex, have centrally placed nucleus and with haemoglobin. Usually in mammals (including human). RBCs are circular and non-nucleated except those of family-Camilladae (camels, llamas, etc), which have nucleated RBCs.

Question

 What is common between parrot, platypus and kangaroo? [CBSE AIPMT 2007]

(a) Homeothermy

(b) Toothless jaws

(c) Functional post-anal tail

(d) Oviparity

Answer/Explanation

Ans. (a)
Parrot (birds), platypus and kangaroo (both mammal) are homeothermic animals. 

Question

In which one of the following sets of animals do all the four give birth to young ones? [CBSE AIPMT 2006]

(a) Lion, bat, whale, ostrich

(b) Platypus, penguin, bat, hippopotamus

(c) Shrew, bat, cat, kiwi

(d) Kangaroo, hedgehog, dolphin, loris

Answer/Explanation

Ans. (d)

Kangaroo, hedgehog, dolphin and loris are all mammals. These give birth to young ones.

Question

153 Which one of the following characters is not typical of the class-Mammalia? [CBSE AIPMT 2005]

(a) Seven cervical vertebrae

(b) Thecodont dentition

(c) Ten pairs of cranial nerves

(d) Alveolar lungs

Answer/Explanation

Ans. (c)
Ten pairs of cranial nerves are not common in mammals but common in frog. In mammals 12 pairs of cranial nerves are found.

Question

 A terrestrial animal must be able to [CBSE AIPMT 2004]

(a) excrete large amounts of water in urine

(b) conserve water

(c) actively pump salts out through the skin

(d) excrete large amounts of salts in urine

Answer/Explanation

Ans. (b)

Since, terrestrial animals do not have automatic access to either fresh or salt water, they must regulate water content in other ways, balancing off gains and losses. 

Question

Given below are four matchings of an animal and its kind of respiratory organ [CBSE AIPMT 2003]

(i) silver fish – trachea

(ii) scorpion – booklung

(iii) sea squirt – pharyngeal gills

(iv) dolphin – skin

The correct matchings are

(a)(ii) and (iv)

(b)(iii) and (iv)

(c)(i) and (iv)

(d)(i), (ii) and (iii)

Answer/Explanation

Ans. (d)
Dolphins are mammals which respire by lungs, which are situated next to the heart in the thorax cavity.

Question

Trachea of cockroach and mammal are similar in having [CBSE AIPMT 1993]

(a) paired nature

(b) non-collapsible walls

(c) ciliated inner lining

(d) origin from head

Answer/Explanation

Ans. (b)

The trachea of cockroach and mammals is lined with spiral thickening of cuticle called intina which prevents the tracheal tubes from collapsing.

Question

 What is common in whale, bat and rat? [CBSE AIPMT 1993, 2000, 04]

(a) Absence of neck

(b) Muscular diaphragm between thorax and abdomen

(c) Extra-abdominal testes to avoid high temperature of body

(d) Presence of external ears

Answer/Explanation

Ans. (b)

The presence of diaphragm is a characteristic feature of mammals, diaphragm acts as a separater between thorax and abdomen. Whale, bat and rat all are mammals and have diaphragm.

Question

 Gorilla, chimpanzee, monkeys and human belong to the same [CBSE AIPMT 1993]

(a) species

(b) genus

(c) family

(d) order

Answer/Explanation

Ans. (d)
Gorilla, chimpanzee, monkeys and humans these all belong to same order-Primata of class-Mammalia.

Question

The cervical vertebrae in humans is [CBSE AIPMT 1993]

(a) same as in whale

(b) more than that in rabbit

(c) double than that of horse

(d) less than that in giraffe

Answer/Explanation

Ans. (a)

The number of cervical vertebrae is constant, i.e. 7 in number in all mammals except sea cow and sloth. So, the cervical vertebrae in humans is same as in whale.

Question

An egg laying mammal is [CBSE AIPMT 1992, 2000]

(a) kangaroo

(b) platypus

(c) koala

(d) whale

Answer/Explanation

Ans. (b)

Egg laying mammals are primitive mammals classified under sub-class-Prototheria. These are oviparous, reptile-like mammals, confined to Australian region.
Ornithorhynchus, (duck billed platypus) is found is Australia and New Zealand is an egg laying mammal.

Question

 Kidney of adult rabbit is [CBSE AIPMT 1991]

(a) pronephros

(b) metanephros

(c) mesonephros

(d) opisthonephros

Answer/Explanation

Ans. (b)

Kidney of adult rabbit is metanephros which is divided into cortex and medulla and its duct is useless. This is most advanced type of kidney found in man and rabbit.

Question

 Eutherians are characterised by [CBSE AIPMT 1989]

(a) hairy skin

(b) true placentation

(c)ovoviviparity

(d)glandular skin

Answer/Explanation

Ans. (b)

Infraclass-Eutheria includes viviparous placental mammals. They give birth to young ones, which gets nourishment through placenta inside the body of its mother.

Question

 Hair occur in all mammals except those of [CBSE AIPMT 1988]

(a) Rodentia

(b) Chiroptera

(c) Primata

(d) Cetacea

Answer/Explanation

Ans. (d)

Order-Cetacea of mammals consists of aquatic mammals in which hairs are present only on snout, e.g. porpoise, killer whale, dolphin, blue whale, sperm whale, etc.

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