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NCERT Solutions for Class 9 Science Chapter 6
Class 9 Science – Biology – Tissues
Extra Questions for Exams
- Question 1:
What is a tissue? - Answer 1:
Tissue is a group of cells of same kind to perform a particular function. - Question 2:
How are simple tissue different from complex tissue? - Answer 2:
Simple tissues are made up of only one type of cells whereas complex tissues are made up of different types of cells. - Question 3:
How is carbon fixation takes place in plants? - Answer 3:
The process of carbon fixation is done by photosynthesis. - Question 4:
How can we determine age of a tree? - Answer 4:
It can be determined by counting annual rings present in the trunk of tree call xylem rings. - Question 5:
Girth of stem increases due to which type of meristem? - Answer 5:
Lateral Meristem. - Question 6:
What is the utility of tissues in a multicellular organism? - Answer 6:
Each specialised function is carried out by different tissues in a multicellular organism to increase efficiency, e.g., nerve tissue transmit electrical signals from sensory organs to brain and vice-versa. - Question 7:
What are the function of stomata? - Answer 7:
(i) Exchange of gases with atmosphere.
(ii) Transpiration (loss of excess of water) in form of water vapours. - Question 8:
(a) Name the plant tissue which is found in the husk of a coconut. Identify the chemical which is responsible for its stiffness.
(b) Give one way in which it differs from parenchymatous cells. - Answer 8:
(a) Sclerenchyma fibres, lignin is responsible for its stiffness.
(b) Scelerenchyma are thick walled dead cells while parenchyma are thin walled living cells. - Question 9:
Differentiate between parenchyma, collenchymas and sclerenchyma on the basis of their cell wall. - Answer 9:
Parenchyma has thin cell wall, made up of cellulose. Cell wall is primary.
Collenchymas has localised thickening of cellulose. Cell wall is primary.
Sclerenchyma has very thick wall due to deposition of lignin. Cell wall is secondary. - Question 10:
(a) Name the living component which is common in both the complex permanent tissue found in the plants. What is its function?
(b) Give any two ways in which this tissue differs functionally from each other. - Answer 10:
(a) Parenchyma. It takes part in the storage of nutrients and slows down lateral conduction (water in xylem and nutrients in phloem).
(b) Xylem:
(i) Xylem conducts water and minerals.
(ii) Conduction is unidirectional, upwardly from roots to stem tips and leaves.
Phloem:
(i) Phloem conducts food materials.
(ii) It is bidirectional from leaves to roots and from roots to stem tips. - Question 11:
What is the specific function of the cardiac muscle? - Answer 11:
Cardiac muscle helps the heart to beat throughout the life with its own contraction and relaxation and involuntary nature. - Question 12:
Name the region in which the parenchyma tissue is present. - Answer 12:
It is permanent tissue of the angiospermic plants.
It is present in cortex, pitch of the stem, roots and mesophyll of leaves. - Question 13:
What is the role of epidermis tissue in the plants? - Answer 13:
(i) It is a protective tissue of angiospermic (flowering) plant.
(ii) It is provides protection to the underlying tissues.
(iii) It forms the outer covering of roots, stems, leaves and flowers.
(iv) It prevents entry of micro- organism. - Question 14:
Differentiate between the striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body. - Answer 14:
Staited muscles:
(i) They have long cylindrical unbranched, multinucleated muscle fibre.
(ii) They join the bones with the limbs.
(iii) These are voluntary muscles.
Unstriated muscles:
(i) They are long, spindle shaped, unnucleated muscles fibres.
(ii) These are present in alimentary canal, blood vessels, iris of eye, ureter and bronchi.
(iii) These are unvoluntry muscles.
Cardiac muscles:
(i) They are cylindrical, branched and unnucleated muscle fibre.
(ii) They are present in heart.
(iii) These are involuntary muscles.
