1. What is botanycal gardan?
A garden in which gymnospermic and angiospermic plants are situated
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15. What is the vascular cambium? What is its function?
The vascular cambium is the secondary meristematic tissue that forms the vascular tissues (xylem and phloem) of the plant in roots and in the stem. Usually, the outer side of the vascular cambium produces a layer of phloem and the…
14. What types of cell form phloem? What are the main features of those cells?
The main cells that form phloem are sieve elements and companion cells. Sieve elements form the vessel walls. They are living enucleated cells positioned in series to form sieve tubes. Between successive vessel elements are communicating pores. Companion cells are…
13. What types of cell form xylem? What are the main features of those cells?
The main cells of xylem are tracheids and vessel elements (these are only in found in angiosperms). Tracheids and vessel elements are dead cells that have lost their cytoplasm. Only their cell wall impregnated with lignin (an impermeable biopolymer) remains.…
12. What are the specialized conducting tissues of plants?
Xylem and Phloem are the vascular tissues of plants. Xylem is the plant tissue that form the vessels that transport water and mineral salts absorbed from the soil to plant cells. Phloem is the plant tissue that forms the vessels…
11. How are water, mineral salts and food (sugar) transported throughout the plant?
Water, mineral salts and sugar are transported throughout the plant through conducting vessels formed by specialized tissues.
10. Where in leaves is photosynthetic tissue often located?
The main photosynthetic tissue is photosynthetic parenchyma (also known as chlorenchyma, do not to be confused with collenchyma), which is often located between the superior and the inferior epidermis of the leaves.
8. What plant tissues are responsible for supporting of plant?
The supportive tissues of plants are collenchyma and sclerenchyma. Collenchyma is made of elongated, living cells that accumulate cellulose and pectin in some regions of the cell wall,giving them an unequal thickness and thus providing flexibility. Sclerenchyma mostly consists of…
7. When seen under a microscope, what type of plant tissue is most likely to present a large amount of cells undergoing cell division?
This type of tissue is most likely meristematic tissue. Meristematic tissues, when seen under a microscope, contain a large number of cells undergoing mitosis.
6. What are the main features of meristematic cells? Why do these cells need to have a high mitotic rate?
Meristematic cells have very thin cell walls, small vacuoles, a well-centralized nucleus and they are constantly undergoing mitosis. Meristematic cells need a high mitotic rate because they are responsible for plant growth.