please solve this question
Answers
Answer:
Plant tissue systems fall into one of two general types: meristematic tissue, and permanent (or non-meristematic) tissue. Meristematic tissue is analagous to stem cells in animals: meristematic cells are undifferentiated continue to divide and contribute to the growth of the plant. In contrast, permanent tissue consists of plant cells that are no longer actively dividing.
Meristems produce cells that quickly differentiate, or specialize, and become permanent tissue. Such cells take on specific roles and lose their ability to divide further. They differentiate into three main tissue types: dermal, vascular, and ground tissue. Each plant organ (roots, stems, leaves) contains all three tissue types
Ground tissue is all the other tissue in a plant that isn’t dermal tissue or vascular tissue. Ground tissue cells include parenchyma, (photosynthesis in the leaves, and storage in the roots), collenchyma (shoot support in areas of active growth), and schlerenchyma (shoot support in areas where growth has ceased).
Parenchyma are the most abundant and versatile cell type in plants. They have primary cell walls which are thin and flexible, and most lack a secondary cell wall. Parenchyma cells are totipotent, meaning they can divide and differentiate into all cell types of the plant, and are the cells responsible for rooting a cut stem. Most of the tissue in leaves is comprised of parenchyma cells, which are the sites of photosynthesis, and parenchyma cells in the leaves contain large quantities of chloroplasts for phytosynthesis. In roots, parenchyma are sites of sugar or starch storage, and are called pith (in the root center) or cortex (in the root periphery). Parenchyma can also be associated with phloem cells in vascular tissue as parenchyma rays.
Collenchyma, like parenchyma, lack secondary cell walls but have thicker primary cells walls than parenchyma. They are long and thin cells that retain the ability to stretch and elongate; this feature helps them provide structural support in growing regions of the shoot system. They are highly abundant in elongating stems. The “stringy” bits of celery are primarily collenchyma cells.
Schlerenchyma cells have secondary cell walls composed of lignin, a tough substance that is the primary component of wood. Schelrenchyma cells therefore cannot stretch, and they provide important structural support in mature stems after growth has ceased. Interestingly, schlerenchyma cells are dead at functional maturity. Schlerenchyma give pears their gritty texture, and are also part of apple cores. We use sclerenchyma fibers to make linen and rope.
HOPE YOU LIKE THE ANSWER