Q78 of 367 Page 75

Which one of the following has cytoplasm but no nucleus :

The cells of phloem are called sieve tubes. These are living cells which contain cytoplasm but no nucleus.

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Which of the following has a three-chambered heart?

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In which of the following are the largest amounts of nitrogen excreted from a mammalian body ?

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The process of carrying food from the leaves to other parts of a plant is called :

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Which of the following is the only conducting tissue in non-flowering plants?