IMPORTANT QUESTIONS AND ANSWERS OF CHAPTER TISSUES
Answers
Answer:
Question 1.
Name a plant tissue having dead cells.
Answer:
Sclerenchyma
Question 2.
What minerals is the bone matrix rich in?
Answer:
Calcium and potassium
Question 3.
Name the water conducting tissue generally present in gymnosperms.
Answer:
TracheidsQuestion 4.
Presence of which chemical in cork cells makes them impervious to water and gases?
Answer:
Suberin
Question 5.
Which tissue in plants provides them flexibility?
Answer:
Collenchyma
Question 6.
Name the muscular tissue that functions throughout life without fatigue.
Answer:
Cardiac muscular tissueQuestion 7.
In desert plants, how does the rate of loss of water get reduced?
Answer:
Presence of cuticle on the surface of desert plants reduce the rate of loss of water.
Question 8.
Which animal tissue helps in repair of tissue and fills the space inside the organ?
Answer:
Areolar tissue
Question 9.
What is a goblet cell?
Answer:
A goblet cell is a unicellular mucus secreting gland.6Question 10.
What is the name of bone cells?
Answer:
Osteoblast cellsQuestion 11.
Which blood cells deal with immune reaction?
Answer:
WBC (White blood cell)
Question 12.
Which cells are responsible for contraction and relaxation movements?
Answer:
Muscle cells
Question 13.
Which cells are responsible for carrying messages?
Answer:
Nerve cells
Question 14.
How are oxygen, food, hormone and waste material transported in the body?
Answer:
Through blood
Question 15.
What is responsible for increase in girth of the stem or root?
Answer:
The girth of the stem or root increases due to lateral meristem (cambium).
Question 16.
What is lignin?
Answer:
Lignin is a chemical substance present in the cell wall of plants which acts as a cement and hardens if.
Question 17.
What is cutin?
Answer:
Cutin is a chemical substance with waterproof quality covering the aerial parts of plants.
Question 18.
Which tissue forms a barrier to keep different body systems separate?
Answer:
Epithelial tissue
Question 19.
What is the composition of the cartilage matrix?
Answer:
Proteins and sugars
Question 20.
What are responsible for contraction and relaxation in muscles?
Answer:
Contractile proteins
Question 21.
Differentiate the following activities on the basis of voluntary (V) or involuntary (IV) muscles.
(a) Jumping of frog
(b) Pumping of the heart
(c) Writing with hand
(d) Movement of chocolate in your intestine [NCERT Exemplar]
Answer:
(a) V
(b) IV
(c) V
(d) IV
Question 22.
What stimulates the movement of muscles?
Answer:
Nerve impulses
Question 23.
Give the name of the connective tissue lacking fibres.
Answer:
Blood
Question 24.
Water hyacinth floats on water surface. Explain. [NCERT Exemplar]
Answer:
Aerenchyma present in the swollen petiole provides buoyancy to the hyacinth. Thus, it floats on water surface.
Question 25.
Which structure protects the plant body against the invasion of parasites? [NCERT Exemplar]
Answer:
The epidermis has thick cuticles and waxy substances to prevent the invasion of parasites.
Question 26.
Why does an organism—plant or animal, require different types of cells in the body?
Answer:
Any organism will have a wide range of cell types. This is because each cell type specialises in one particular function. And for the proper working of an organism many functions like food transport, immunity, strength, etc., are needed to be performed properly.
Question 27.
If a potted plant is covered with a glass jar, water vapour appears on the wall of the glass jar. Why? [NCERT Exemplar]
Answer:
This happens because of transpiration due to which water is released from the plant in the form of water vapour which appears on the glass jar.
Question 28.
Why are voluntary muscles also called skeletal muscles?
Answer:
Voluntary muscles are also called skeletal muscles because they are mostly attached to the bones and help in body movement.
Explanation:
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