what are simple tissues? Explain their different types.(2 marks)
Answers
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⭕️⚫️A group of cells which are similar in origin; similar in structure and similar in function are called simple permanent tissue. Simple tissue: Three types of simple tissues occur in plants:
(a) Parenchyma (b) Collenchyma (c) Sclerenchyma
⭕️✨(a) Parenchyma: It is a simple, permanent living tissue which is made up of thin-walled cells. The cells of this tissue are oval, elongated, and loosely packed with large intracellular space. Their cell wall is made up of cellulose. Each cell encloses a large central vacuole, cytoplasm and a prominent nucleus.
⭕️✨(b) Collenchyma: It is a another type of simple permanent tissue which is found few layer below the epidermis of leaves and stem. The cells of this tissue are living, elongated and tightly packed with no inter-cellular space. The cells have small nucleus, large vacuoles and thin cell wall but irregularly thickened at the corners.
⭕️✨(c) Sclerenchyma: It is a supporting tissue. It is the tissue which make plant hard and stiff.
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