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What is reproduction? How do fish reproduce?

Important Questions on Nature's Gifts

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Fill in the blank with a right word:

[grow, gills, eggs, food]

Snakes reproduce by laying _____.

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The following lay their eggs in the soil and cover them with mud: 
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The eggs of birds contain a growing baby called the
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Fish and frogs lay many eggs at a time. Why?
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The process of producing young ones is called
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Fill in the blank with a suitable word from the bracket:

Animals that grow up feeding on their mother's milk are called _____ (Amphibians/Reptiles/Mammals). 

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The process of producing one's own kind is called _____.
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Choose the right word from the given bracket and fill in the blank.

_____ lay eggs in their nests. (Birds/ Monkeys)

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What is the young one of a frog called? How is it different from an adult frog? 
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In a bird’s egg the _____ contains the stored food for the chick.
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Give two examples of egg laying reptiles.
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All living beings reproduce in the same way.
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Fish lay thousands of eggs at a time. But their number remains constant, why?
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A fish lays thousands of eggs at a time in the water but only a few of them develop into baby fishes. Why?