Select the correct statement about the human digestive system.

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All the four layers of the wall of alimentary canal show modifications in different parts of the alimentary canal.

The endocrine portion of the pancreas secretes enzymes while exocrine portion secretes hormones.

The upper surface of the tongue has small projections called papillae, all of which bear taste buds.

Four pairs of salivary glands situated just outside the buccal cavity secrete saliva into the oral cavity.

answer is D.

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Detailed Solution

All the four layers show modifications in different parts of the alimentary canal. There are only three pairs of salivary glands in humans; infraorbital glands are absent. The exocrine portion of the pancreas secretes enzymes while endocrine portion secretes hormones. Some papillae (e.g., filiform papillae) do not bear taste buds.

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