Question

Birds differ from bats in the absence of:
(a) 4- chambered hearts
(b) Homeothermy
(c) Diaphragm
(d) Trachea

Answer 1

Hint: Birds belong to the classification Aves whereas bats belong to the classification mammals. Both have analogous organs that perform similar functions but are morphologically different.

Complete answer:

Birds	Bats
Birds have wings that help them to fly, these wings have feathers which assist flight.	Bats have wings that help them to fly, these wings are made of a flap of skin.
Birds have a three-chambered heart	Bats are mammals and like all other mammals have a four-chambered heart.
Birds are oviparous i.e., they lay eggs.	Bats are viviparous i.e., they give birth to young ones.
Birds feed their young ones chewed food.	Bats nursed their young ones with milk.
They have feathers as an exoskeleton.	They have hair as an exoskeleton.
Birds have lightweight bodies due to hollow bones. They can thus sit and sleep upright.	Bats have heavy bodies compared to birds and hence hang from branches.
Birds gather food during the day.	Bats are nocturnal and hence gather, hunt and feed during the night.
A bird’s skeleton doesn’t show the presence of arms.	Bat skeleton shows the presence of modified arms.
Birds have a complex respiratory system and their chambers have more air sacks to increase the efficiency of breathing and get more oxygen.	Bats have lungs.
Birds do not echolocate.	Bats use echolocation to locate objects in the dark

So, the correct answer is a 4-chambered heart.

Note: The animal platypus is a mammal that lays eggs. The duck-billed platypus usually lives near freshwater bodies and feeds on small fish and insects. Bats use ultrasound to capture its prey.