1 point
22. Asertion Chlorenchyma is specialized type of parenchyma. Reason: It
is responsible for conducting photosynthesis *
o
A) bem assertion and reason are CORRECT and reason is the CORRECT
nation of the assertion
3 both assertion and reason are CORRECT, but reason is NOT THE CORRECT
paration of the assertion
O Cassertion is CORRECT, but reason is INCORRECT
Di assertion is INCORRECT, but reason is CORRECT
Answers
Answer:
Parenchyma (/pəˈrɛŋkɪmə/;[2][3] from Greek παρέγχυμα parenkhyma, "visceral flesh" from παρεγχεῖν parenkhein, "to pour in" from παρα- para-, "beside", ἐν en-, "in" and χεῖν khein, "to pour")[4] is a versatile ground tissue that generally constitutes the "filler" tissue in soft parts of plants. It forms, among other things, the cortex (outer region) and pith (central region) of stems, the cortex of roots, the mesophyll of leaves, the pulp of fruits, and the endosperm of seeds. Parenchyma cells are living cells and may remain meristematic at maturity—meaning that they are capable of cell division if stimulated. They have thin and flexible cellulose cell walls, and are generally polyhedral when close-packed, but can be roughly spherical when isolated from their neighbours. Parenchyma cells are generally large. They have large central vacuoles, which allow the cells to store and regulate ions, waste products, and water. Tissue specialised for food storage is commonly formed of parenchyma cells.
Cross section of a leaf showing various ground tissue types
Cross section of a leaf showing various ground tissue types
Parenchyma cells have a variety of functions:
In leaves, they form two layers of mesophyll cells immediately beneath the epidermis of the leaf, that are responsible for photosynthesis and the exchange of gases.[5] These layers are called the palisade parenchyma and spongy mesophyll. Palisade parenchyma cells can be either cuboidal or elongated. Parenchyma cells in the mesophyll of leaves are specialised parenchyma cells called chlorenchyma cells (parenchyma cells with chloroplasts). Chlorenchyma cells are also found in other parts of the plant.
Storage of starch, protein, fats, oils and water in roots, tubers (e.g. potatoes), seed endosperm (e.g. cereals) and cotyledons (e.g. pulses and peanuts)
Secretion (e.g. the parenchyma cells lining the inside of resin ducts)
Wound repair[citation needed] and the potential for renewed meristematic activity
Other specialised functions such as aeration (aerenchyma) provides buoyancy and helps aquatic plants float.
Chlorenchyma cells carry out photosynthesis and manufacture food.
The shape of parenchyma cells varies with their function. In the spongy mesophyll of a leaf, parenchyma cells range from near-spherical and loosely arranged with large intercellular spaces,[5] to branched or stellate, mutually interconnected with their neighbours at the ends of their arms to form a three-dimensional network, like in the red kidney bean Phaseolus vulgaris and other mesophytes.[6] These cells, along with the epidermal guard cells of the stoma, form a system of air spaces and chambers that regulate the exchange of gases. In some works, the cells of the leaf epidermis are regarded as specialised parenchymal cells,[7] but the modern preference has long been to classify the epidermis as plant dermal tissue, and parenchyma as ground tissue.[8]
Shapes of parenchyma:
Polyhedral (found in pallisade tissue of the leaf)
Spherical
Stellate (found in stem of plants and have well developed air spaces between them)
Elongated (also found in pallisade tissue of leaf)
Lobed (found in spongy and pallisade mesophyll tissue of some plants)
Collenchyma
Cross section of collenchyma cells
Collenchyma tissue is composed of elongated cells with irregularly thickened walls. They provide structural support, particularly in growing shoots and leaves. Collenchyma tissue makes up things such as the resilient strands in stalks of celery. Collenchyma cells are usually living, and have only a thick primary cell wall[9] made up of cellulose and pectin. Cell wall thickness is strongly affected by mechanical stress upon the plant. The walls of collenchyma in shaken plants (to mimic the effects of wind etc.), may be 40–100% thicker than those not shaken.
There are four main types of collenchyma:
Angular collenchyma (thickened at intercellular contact points)
Tangential collenchyma (cells arranged into ordered rows and thickened at the tangential face of the cell wall)
Annular collenchyma (uniformly thickened cell walls)
Lacunar collenchyma (collenchyma with intercellular spaces)
Collenchyma cells are most often found adjacent to outer growing tissues such as the vascular cambium and are known for increasing structural support and integrity.
The first use of "collenchyma" (/kəˈlɛŋkɪmə, kɒ-/[10][11]) was by Link (1837) who used it to describe the sticky substance on Bletia (Orchidaceae) pollen. Complaining about Link's excessive nomenclature, Schleiden (1839) stated mockingly that the term "collenchyma" could have more easily been used to describe elongated sub-epidermal cells with unevenly thickened cell
Answer:
A) Both assertion and reason are correct, and the reason is the correct explanation of Assertion
Explanation:
Chlorenchyma is a specialized cell present in the green plants, and other plants that have green parts in them. They contain the photosynthesizing pigment, known as Chlorophyll, which helps in Photosynthesis, thereby producing complex carbohydrate or glucose. They are Parenchyma in the sense that they are plant tissue, and have all the required cell organelles of a general Parenchyma cell, that is, the Chlorenchyma have intercellular spaces in them, they have a single enlarged Vacuole, and have a Nucleus at one corner, as the vacuole has pushed it there. It also possesses a cell membrane, and cytoplasm. It is not a type of Collenchyma or Sclerenchyma because of either of the plant cells has thick walls and no intercellular spaces in between them. So, Cholrenchyma is a type of Parenchyma cell, holding the Chloroplast plastid, which has the Chlorophyll in it.