Tissue for Class 9 Science Important Questions
Q 1 – Why does an organism—plant or animal, require different types of cells in the body?
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.
Q 2 – Which cell does not have a perforated cell wall?
(a) Tracheids
(b) Companion cells
(c) Sieve tubes
(d) Vessels
(b) Companion cells
Q 3 – Why are voluntary muscles also called skeletal muscles?
Voluntary muscles are also called skeletal muscles because they are mostly attached to the bones and help in body movement
Q 4 – How are messages conveyed from one place to another within the body?
Nervous tissue is made up of neurons that receive and conduct impulses. Neurons are highly specialised for being stimulated and then transmitting the stimulus very rapidly from one place to another within the body. Impulses are the passage of electrical activity along the axon of a nerve cell.
Q 5 – What are involuntary muscles? Where are they found?
The muscles which do not move on our will are called involuntary muscles. The movement of food in the alimentary canal or the contraction and relaxation of blood vessels are involuntary movements. These muscles are also called as smooth muscles. They are also found in the iris of the eye, in ureters and in bronchi of the lungs.
Q 6 – Which of the following tissues has dead cells?
(a) Parenchyma
(b) Sclerenchyma
(c) Collenchyma
(d) Epithelial tissue
(b) Sclerenchyma
Q 7 – Find out incorrect sentence.
(a) Parenchymatous tissues have intercellular spaces.
(b) Collenchymatous tissues are irregularly thickened at corners.
(c) Apical and intercalary meristems are permanent tissues.
(d) Meristematic tissues, in its early stage, lack vacuoles.
(c) Apical and intercalary meristems are permanent tissues.
Q 8 – Differentiate between voluntary and involuntary muscles. Give one example of each type.
Voluntary muscles can be moved by the conscious will when we want them to move. For example, muscles of limbs or skeletal muscles. Involuntary muscles function on their own. We cannot start or stop them from working by our desire. Examples are cardiac muscles and smooth muscles.
Q 9 – What happens to the cells formed by meristematic tissue?
The cells formed by meristematic tissue take up a specific role and lose their ability to divide. As a result, they form a permanent tissue. This process of taking up a permanent shape, size and function is called differentiation.
Q 10 – Why is the epidermis present as a thick waxy coating of cutin in desert plants?
A thick waxy coating of cutin is present in desert plants to prevent excessive loss of water during transpiration. Due to this, plants can survive in scarcity of water in deserts.
Q 11 – How are glandular epithelium formed?
An epithelial cell often acquires additional specialisation as gland cells, which can secrete substances at the epithelial surface. Sometimes, a portion of the epithelial tissue folds inward and a multicellular gland is formed. This is glandular epithelium.
Q 12 – (a) What is the lining of blood vessels made up of?
(b) What is the lining of small intestine made up of?
(c) What is the lining of kidney tubules made up of?
(d) Where are the epithelial cells with cilia found?
(a) Squamous epithelium
(b) Columnar epithelium
(c) Cuboidal epithelium
(d) Respiratory tract
Q 13 – Why are xylem and phloem called complex tissues? How are they different from one other?
Ans. Xylem and phloem are called as complex tissues as they are made up of more than one type of cells. Following are the differences between xylem and phloem
Xylem | Phloem |
1. Xylem mainly consists of dead cells (except xylem parenchyma). | 1. Phloem consists of living cells (except phloem fibre). |
2. It conducts water and minerals from roots to aerial parts of the plant. | 2. It translocates prepared food from leaves to storage organs and growing parts of the body. |
Q 14 – While doing work and running, you move your organs Like hands, legs etc. Which among the following is correct?
(a) Smooth muscles contract and pull the ligament to move the bones.
(b) Smooth muscles contract and pull the tendons to move the bones.
(c) Skeletal muscles contract and pull the ligament to move the bones.
(d) Skeletal muscles contract and pull the tendon to move the bones
(d) Skeletal muscles contract and pull the tendon to move the bones.
Q 15 – Which muscles act involuntarily?
(i) Striated muscles
(ii) Smooth muscles
(iii) Cardiac muscles
(iv) Skeletal muscles
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
(b) (ii) and (iii)
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Fill in the blanks
Q 16 – Apical meristem is present at the growing tips of stems and roots and increases the ……………. of the stem and the root.
Length
Q 17 – The process by which cells take up a permanent shape, size, and a function is called ……………..
specialization
Q 18 – The husk of a coconut is composed of …………… tissue.
sclerenchyrna
Q 19 – Each neuron has a single long part, called the ……………. and many short, branched parts called ………………
axon, dendrites
Q 20 – Match the following columns
Column A | Column B |
(a) Adipocytes | (i) Blood |
(b) Cartilage | (ii) Join bone to bone |
(c) Tendon | (iii) Cambium |
(d) Skin | (iv) Platelets |
(e) Veins of leaves | (v) Fat containing cell |
(f) Clotting of blood | (vi) Joins muscle to bones |
(g) Fluid connective tissue | (vii) Stratified squamous epithelium |
(h) Increases girth of stem | (viii) Composed of proteins and sugars |
(i) Ligament | (ix) Sclerenchyma |
Column A | Column B |
(a) Adipocytes | (v) Fat containing cell |
(b) Cartilage | (viii) Composed of proteins and sugars |
(c) Tendon | (vi) Joins muscle to bones |
(d) Skin | (vii) Stratified squamous epithelium |
(e) Veins of leaves | (ix) Sclerenchyma |
(f) Clotting of blood | (iv) Platelets |
(g) Fluid connective tissue | (i) Blood |
(h) Increases girth of stem | (iii) Cambium |
(i) Ligament | (ii) Join bone to bone |