Exercises
1. Define the term "tissue".
2. How many types of elements together
tissue? Name them.
3. How are simple tissues different from
plants?
4. Differentiate between parenchyma
sclerenchyma on the basis of their
Answers
1) ,In biology, tissue is a cellular organizational level between cells and a complete organ. A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.2) Answer: Four types of elements together make up the xylem tissue. These elements are- (a) tracheids, (b) vessels, (c) xylem parenchyma and (d) xylem fibres.3) Permanent tissues are the tissues which have lost the ability to divide. Permanent tissues, furthermore, can be divided into simple tissues and complex tissue.4) Parenchyma has a thin cell wall of their cells, and are made up of cellulose. Whereas collenchyma cells have an uneven cell wall made up of pectin and hemicellulose. There is a hard and thick cell wall present of the sclerenchyma cells, which is made up of the lignin.
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Answer:
1) Similar cells, performing a similar function form tissue.
2) Four types of elements together make up the xylem tissue. These elements are- (a) tracheids, (b) vessels, (c) xylem parenchyma and (d) xylem fibres.
3) These tissues are made up of more than one type of cells. ... Example of simple tissues are collenchymas, parenchyma. Examples of complex tissues are xylem and phloem.
4) Parenchyma cells are found in every soft part of the plant whereas sclerenchyma cells are found in mature parts of the plants or trees. Parenchyma has a thin cell wall of their cells, and are made up of cellulose.
sclerenchyma:
Mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. ... The major function of sclerenchyma is support. Unlike collenchyma, mature cells of this tissue are generally dead and have thick walls containing lignin. Their size, shape, and structure vary greatly.
Parenchyma:
Thin primary cell wall Alive at maturity Retain the capacity to divide Photosynthesis Food storage Wound healing and tissue regeneration