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Tissues
Physics IX : Complete NCERT Exercise Solutions
Master Class 9 Science Chapter 6: Tissues with detailed NCERT solutions. Learn about plant tissues (meristematic & permanent) and animal tissues (epithelial, muscular, etc.) with their functions, diagrams, and solved exercise questions for CBSE exams.
Question 6.1
Define the term “tissue”.
Answer & Explanation:
A tissue is a group of cells that are similar in structure and work together to perform a specific function.
In multicellular organisms, tissues provide division of labour, making bodily functions more efficient and organised.
In multicellular organisms, tissues provide division of labour, making bodily functions more efficient and organised.
Question 6.2
How many types of elements together make up the xylem tissue? Name them.
Answer & Explanation:
Xylem is composed of four types of elements:
• Tracheids
• Vessels
• Xylem parenchyma
• Xylem fibres
These elements collectively help in the transport of water and minerals and provide mechanical support.
• Tracheids
• Vessels
• Xylem parenchyma
• Xylem fibres
These elements collectively help in the transport of water and minerals and provide mechanical support.
Question 6.3
How are simple tissues different from complex tissues in plants?
Answer & Explanation:
Simple tissues are made up of only one type of cell performing similar functions, e.g. parenchyma, collenchyma, and sclerenchyma.
Complex tissues consist of more than one type of cell working together for a common function, e.g. xylem and phloem, mainly involved in conduction.
Complex tissues consist of more than one type of cell working together for a common function, e.g. xylem and phloem, mainly involved in conduction.
Question 6.4
Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell walls.
Answer & Explanation:
• Parenchyma: Thin cell walls made of cellulose.
• Collenchyma: Cell walls unevenly thickened at the corners due to cellulose and pectin.
• Sclerenchyma: Very thick, lignified cell walls providing rigidity and strength.
• Collenchyma: Cell walls unevenly thickened at the corners due to cellulose and pectin.
• Sclerenchyma: Very thick, lignified cell walls providing rigidity and strength.
Question 6.5
What are the functions of stomata?
Answer & Explanation:
The main functions of stomata are:
• Exchange of gases (oxygen and carbon dioxide)
• Loss of water vapour during transpiration
These processes are essential for photosynthesis and respiration.
• Exchange of gases (oxygen and carbon dioxide)
• Loss of water vapour during transpiration
These processes are essential for photosynthesis and respiration.
Question 6.6
Diagrammatically show the difference between the three types of muscle fibres.
Answer & Explanation:
The three types of muscle fibres are:
• Striated muscles – voluntary, multinucleate, show stripes
• Smooth muscles – involuntary, spindle-shaped, no striations
• Cardiac muscles – involuntary, branched, rhythmic contractions
(Diagrams should be drawn neatly in the exam.)
• Striated muscles – voluntary, multinucleate, show stripes
• Smooth muscles – involuntary, spindle-shaped, no striations
• Cardiac muscles – involuntary, branched, rhythmic contractions
(Diagrams should be drawn neatly in the exam.)
Question 6.7
What is the specific function of the cardiac muscle?
Answer & Explanation:
Cardiac muscles are responsible for the rhythmic contraction and relaxation of the heart, ensuring continuous circulation of blood throughout the body.
Question 6.8
Differentiate between striated, unstriated and cardiac muscles on the basis of structure and location.
Answer & Explanation:
• Striated muscles: Found in limbs, voluntary, cylindrical, multinucleate.
• Unstriated muscles: Found in internal organs, involuntary, spindle-shaped, uninucleate.
• Cardiac muscles: Found in heart, involuntary, branched, single nucleus.
• Unstriated muscles: Found in internal organs, involuntary, spindle-shaped, uninucleate.
• Cardiac muscles: Found in heart, involuntary, branched, single nucleus.
Question 6.9
Draw a labelled diagram of a neuron.
Answer & Explanation:
A neuron consists of a cell body, dendrites, and a long axon.
(A neat, labelled diagram must be drawn in the examination.)
(A neat, labelled diagram must be drawn in the examination.)
Question 6.10
Name the following:
(a) Tissue forming the inner lining of the mouth
(b) Tissue connecting muscle to bone
(c) Tissue transporting food in plants
(d) Tissue storing fat in our body
(e) Connective tissue with a fluid matrix
(f) Tissue present in the brain
(a) Tissue forming the inner lining of the mouth
(b) Tissue connecting muscle to bone
(c) Tissue transporting food in plants
(d) Tissue storing fat in our body
(e) Connective tissue with a fluid matrix
(f) Tissue present in the brain
Answer & Explanation:
(a) Squamous epithelium
(b) Tendon
(c) Phloem
(d) Adipose tissue
(e) Blood
(f) Nervous tissue
(b) Tendon
(c) Phloem
(d) Adipose tissue
(e) Blood
(f) Nervous tissue
📘 Exam Preparation Tip:
Create a comparative chart for different types of plant and animal tissues, focusing on their location, structure, and function. Practice drawing neat diagrams of tissue types like parenchyma or muscular tissue.