Birds have

A

two -chambered heart

B

one-chambered heart

C

four-chambered heart

D

three-chambered heart

Text Solution

Verified by Experts

The correct Answer is:
C
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(i) Planaria, insects, octopus and vertebrates all have eyes. Can we group eyes of these animals together to establish a common evolutionary origin? Justify your answer. (ii) "Birds have evolved from reptiles". State evidence to prove the statement.

(i) Planaria, insects, octopus and vertebrates all have eyes. Can we group eyes of these animals together to establish a common evolutionary origin? Justify your answer. (ii) "Birds have evolved from reptiles". State evidence to prove the statement.

Knowledge Check

  • Which of the following statements is/are incorrect? (i) Fishes have streamlined body in order to facilitate swimming. (ii) Birds have strong flight muscles which aid them in flying. (iii) Snakes have hollow bones that help them in locomotion. (iv) Tigers and wolves have sharp pointed teeth to help them tear the fleash of their prey.

    A
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    B
    (iii) and (iv) only
    C
    (iii) only
    D
    (i) and (iii) only
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    A
    claimed
    B
    verified
    C
    observed
    D
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  • Throughout the ages, birds have been a source of wonder to all who have (936) ______ their soaring flight or listened to (937)______ sweet songs. As a group, birds are (938) _______. They are the only animals creatures covered (939) ----- feathers. This evolutionary development (940) ______ birds from all other animals.

    A
    them
    B
    its
    C
    their
    D
    they
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    A train, travelling at 20 km//hr is approaching a platform. A bird is sitting on a pole on the platform. When the train is at a distance of 2 km from pole, breakes are applied which produce auniform deceleration in it. At that instant the bird flies towards the train at 60 km//hr and after touching the nearest point on the train flies back to the pole and then flies towards the train and continues repeating itself. Calculate how much distance will the bird have flown before the train stops?

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