ANIMAL REPRODUCTION AND DEVELOPMENT
ASEXUAL REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a starfish regrows a missing arm
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a worm cut in half grows into two separate worms
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a deer grows a new antler to replace a broken one
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a lizard’s tail falls off and a new one grows back
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Detailed explanation-1: -In asexual reproduction, the planarian detaches its tail end and each half regrows the lost parts by regeneration, allowing endoblasts (adult stem cells) to divide and differentiate, thus resulting in two worms.
Detailed explanation-2: -In some organisms, regeneration is a form of asexual reproduction. In this method, the cut parts of the body of an organism give rise to new individuals. An example of an organism that reproduces through this method is Hydra.
Detailed explanation-3: -Almost all worms can regrow their tails if they are amputated, and many earthworms can lose several segments from their head end and they will grow back, the Washington Post reports. For some worms, however, the more segments that are cut off, the less likely they are to be fully regenerated.
Detailed explanation-4: -Summary: Scientists have nailed the biomechanics of a centuries-long puzzle on how freshwater flatworms known as planarians reproduce. The asexual freshwater worms, notoriously difficult to study, tear themselves into two pieces that go on to form two new worms.
Detailed explanation-5: -There are two types of proliferation modes in nature: sexual and asexual, and regeneration is a form of asexual reproduction.