The blood vessel which carries blood from the alimentary canal to the liver is the

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The purple colour which is observed shows the presence of

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The major site of photosynthesis in the leaf is the

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Fungi are heterotropic because they

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The flow of air and water in or out of the mesophyll layer of a leaf is controlled by the

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The structure labelled Y is the

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The structure labelled X is used by the organism in the same way as man uses his

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Which of the following insects undergoes incomplete metamorphosis?

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A tissue can best be defined as

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The essential structural difference between hydra and tapeworm is that while Hydra

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An onion is a bulb because it

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The flowering period of plants in a habitat is determined by the

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