Anatomy of Flowering Plants


Anatomy of Flowering Plants logoSubject: Biology    Exam: CMC Vellore

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Important Points

Sieve tube elements: At maturity become impregnated with callose. They are devoid of nucleus at maturity. However, they possess a peripheral cytoplasm as well as a large vacuole. The uniqueness of the sieve tube is that although without nucleus, it is living and the nucleus of the companion cells control its functional activities.
Stomata: Are found on the epidermis of all the green aerial parts of plants, but are abundant on the lower surface of leaves as they regulate the process of transpiration. They are sunken in the pits or cavities in xerophytes.Each stomata is surrounded by two semilunar cells known as the guard cells. In the dicotyledonous plants these are bean-shaped, but in sedges and grasses these are dumb-bell-shaped. The guard cells are living and possess chloroplasts.
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