Chapter 6: Tissues
In-Text Questions & Answers
Page No. 61
Question 1:
What is a tissue?
Answer:
A tissue is a group of cells that are similar in structure and work together to perform a specific function.
Examples: Blood, muscle, phloem.
Question 2:
What is the utility of tissues in multicellular organisms?
Answer:
Tissues are useful in multicellular organisms because:
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They bring about division of labour, where different tissues perform different functions.
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This increases efficiency of work.
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Tissues help in the organisation of cells, forming organs and organ systems.
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They allow complex organisms to perform many functions simultaneously.
Thus, tissues make the body more organised and efficient.
Page No. 65 – Chapter 6: Tissues
Question 1:
Name the three types of simple permanent tissues.
Answer:
The three types of simple permanent tissues are:
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Parenchyma
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Collenchyma
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Sclerenchyma
Question 2:
Describe the characteristics and functions of parenchyma.
Answer:
Characteristics:
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Cells are living
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Thin cell walls
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Large intercellular spaces
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Usually oval or round in shape
Functions:
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Storage of food and water
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Photosynthesis (when chlorophyll is present, called chlorenchyma)
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Provides support to plants by turgidity
Question 3:
Describe the characteristics and functions of collenchyma.
Answer:
Characteristics:
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Cells are living
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Cell walls are unevenly thickened at the corners
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Very little intercellular space
Functions:
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Provides flexibility to plant parts
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Provides mechanical support to stems and leaves
Question 4:
Describe the characteristics and functions of sclerenchyma.
Answer:
Characteristics:
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Cells are dead
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Cell walls are very thick and lignified
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No intercellular spaces
Functions:
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Provides strength and rigidity to plants
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Forms hard coverings like nut shells and coconut husk
Page No. 69 – Chapter 6: Tissues
Question 1:
Name the different types of animal tissues.
Answer:
The four main types of animal tissues are:
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Epithelial tissue
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Connective tissue
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Muscular tissue
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Nervous tissue
Question 2:
What is epithelial tissue? Mention its functions.
Answer:
Epithelial tissue is a tissue that covers the body surface, lines the internal organs and cavities, and forms glands.
Functions:
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Protection of underlying tissues
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Absorption (e.g., intestine)
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Secretion (e.g., glands)
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Excretion and diffusion
Question 3:
Name the different types of epithelial tissue.
Answer:
The different types of epithelial tissue are:
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Squamous epithelium
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Cuboidal epithelium
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Columnar epithelium
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Ciliated epithelium
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Glandular epithelium
Question 4:
Describe squamous epithelium with its function.
Answer:
Squamous epithelium consists of thin, flat cells arranged like tiles on a floor.
Function:
It allows easy diffusion and filtration of substances.
Example:
Lining of blood vessels and air sacs of lungs.
Question 5:
Describe cuboidal epithelium with its function.
Answer:
Cuboidal epithelium is made of cube-shaped cells.
Function:
It helps in secretion and absorption.
Example:
Lining of kidney tubules and glands.