NCERT Class 9 Science Solutions: Chapter 6 – Tissues Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 11:

Q. Identify the type of tissue in the following: Skin, bark of tree, bone, lining of kidney tubule, vascular bundle.

Answer:

Q_11_Image_Showing_Types_Of_Tissue
SkinStratified Squamous epithelium
Bark of treeCork (secondary meristem) protective tissue
BoneConnective tissue
Lining of kidney tubuleCuboidal epithelium (Cuboidal epithelial tissue)
Vascular bundleComplex permanent tissue (Xylem and Phloem)

Question 12:

Q. Name the regions in which parenchyma tissue is present.

Answer:

Parenchyma is a simple permanent tissue of angiosperms plants. It is present in cortex and pith of stem and roots. It is also present in mesophyll of leaves. When it contains chlorophyll, it is called Chlorenchyma, found in green leaves.

Question 13:

Q. What is the role of epidermis in plants?

Answer:

Epidermis is a protective tissue of angiospermic plants. It provides protection to underlying tissues. Epidermis forms outer covering of various plant organs such as roots, stem, leaves, and flowers and remains in direct contact with the environment. Any substance whether solid, liquid or gas can enter into the plant or move outside only after passing through this layer. Epidermis helps in absorption, secretion, gaseous exchange and transpiration. It helps in preventing the entry of pathogens.

Q_14_Image_Showing_Epidermis

Question 14:

Q. How does the cork act as a protective tissue?

Answer:

The cork cells are dead cells and do not have any intercellular spaces. They also have a chemical called suberin in their walls that makes them impervious to gases and water thus they provide strong mechanical strength to plants.

The cell wall of the cork cells are coated with suberin (a waxy substance) . Suberin makes these cells impermeable to water and gases. Cork is protective in function; it protects underlying tissues from desiccation, infection and mechanical injury, its cells are dead and compactly arranged without intercellular spaces and they also have deposition of suberin on the walls that makes them impervious to gases and water.

Question 15:

Q. Complete the table:

Permanet Tissue Types

Answer:

Q_15_Image_Showing_Permanent_Tissue

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