CBSE Important Questions Class 9 Science Chapter 6 – Tissues

Class 9 Science Chapter 6 Tissues is part of the CBSE Class 9 Science syllabus. It explains what a tissue is and the different tissues found in plants and animals. Students learn about meristematic and permanent plant tissues such as parenchyma, collenchyma, sclerenchyma, xylem and phloem, and about animal tissues such as epithelial, connective, muscular and nervous tissue.

These CBSE important questions for Class 9 Science Chapter 6 cover the lining of the small intestine and the trachea, the matrix of bone, blood, cartilage and ligament, levels of organisation, lymphocytes and antibodies, translocation through phloem, the parts of phloem and their functions, lignified xylem walls, and simple versus complex permanent tissues. Every question has a clear step-by-step answer in simple English with figures, so students can practise on their own, parents can check the answers, and teachers can use them for class tests.

Q1. The given image shows the human digestive system. Which of the following types of cells are present in the lining of the organ labelled as X?

Human digestive system with the small intestine marked as X

Answer: The organ marked X is the small intestine, and its lining is made of columnar epithelium.
The cells of columnar epithelium are tall and pillar-like. This shape suits the small intestine because its main job is absorption of digested food, and the tall cells give a large surface area for absorbing nutrients.

Q2. Which of the following options correctly describes the matrix present in various kinds of connective tissues given below?

Option Bone Blood Cartilage Ligament
A Calcium and phosphorus Proteins and sugar Plasma Little matrix
B Calcium and phosphorus Plasma Proteins and sugar Little matrix
C Calcium and phosphorus Proteins and sugar Little matrix Plasma
D Calcium and phosphorus Little matrix Plasma Proteins and sugar

(a) A
(b) B
(c) C
(d) D

Answer: (b) B
Bone has a hard matrix made of calcium and phosphorus compounds. Blood has a fluid matrix called plasma. Cartilage has a solid but flexible matrix made of proteins and sugars. A ligament is a strong elastic tissue with very little matrix. Only option B gives all four correctly.

Q3. Carefully observe the given image in which blood flow through the blood vessel is shown. Which of the following correctly represents the level of organisation of structures A and B?
(a) A – Tissue; B – Organ
(b) A – Tissue; B – Cellular
(c) A – Organ; B – Cellular
(d) A – Organ; B – Tissue

Blood flowing through a blood vessel with A and B marked

Answer: (c) A – Organ; B – Cellular
A is the blood vessel. It is made of several different tissues (epithelial, muscular and connective) working together, so it is at the organ level.
B is a single blood cell, so it is at the cellular level.

Q4. Which of the following statements about the given image is CORRECT?
(a) Both A and B are epithelial tissues, C is the muscular tissue.
(b) Both A and C are fluid connective tissue, B is the epithelial tissue.
(c) Both A and C are connective tissues, B is the muscular tissue.
(d) Both A and B are connective tissues, C is the smooth muscle tissue.

A bone with parts A, B and C marked

Answer: (c) Both A and C are connective tissues, B is the muscular tissue.
A is tendon or cartilage and C is bone; both of these are connective tissues, which join and support different parts of the body. B is muscle, which is muscular tissue and brings about movement.

Q5. (i) "Epithelium is protective in nature." Justify and support your answer with two examples.
(ii) Name the structure that receives impulses in the neuron.

Answer: (i) Epithelial tissue covers the outside of the body and lines the inside of organs, so it acts like a protective sheet.
(a) The skin of our body is made of epithelial tissue, and it protects the whole body from germs, injury and water loss.
(b) Epithelial tissue covers delicate internal organs and protects them from mechanical injury.
(ii) The dendrite receives impulses in a neuron and carries them towards the cell body.

Q6. Carefully observe the given images which show various types of leucocytes. Identify the cell or cells which produce antibodies on being exposed to a foreign molecule.
(a) i, ii and iii
(b) ii and iv
(c) ii and v
(d) only i

Different types of white blood cells marked i to v

Answer: (d) only i
The cell shown in image i is a lymphocyte. Lymphocytes are the white blood cells that make antibodies when a foreign substance (antigen) enters the body. The other cells shown, such as neutrophils and monocytes, fight germs by engulfing them, not by making antibodies.

Q7. The given image shows two types of tissues labelled as X and Y. Identify the option which is correct for the movement of sucrose through the plant.

Plant vascular tissues marked X and Y

Option Process of sucrose transport Structure responsible
A Transpiration X
B Translocation Y
C Translocation X
D Transpiration Y

(a) A
(b) B
(c) C
(d) D

Answer: (b) B
The movement of food (sucrose) made in the leaves to all other parts of the plant is called translocation, and it takes place through the phloem, which is Y in the figure. X is xylem, which carries water and minerals upwards, and transpiration is the loss of water vapour from leaves.

Q8. The given image shows the human lungs. Identify the type of tissue which lines the structure labelled as X.
(a) Squamous epithelium
(b) Stratified epithelium
(c) Cuboidal epithelium
(d) Ciliated columnar epithelium

Human lungs with the trachea marked as X

Answer: (d) Ciliated columnar epithelium
X is the trachea (windpipe). Its lining has tall columnar cells with tiny hair-like cilia on top. The cilia keep moving and push dust and mucus upwards and out of the air passage, so the air reaching the lungs is clean.

Q9. The given image represents one of the vascular tissues in the plant, having four different parts P, Q, R and S. Match the labelled parts with their associated functions.

Phloem tissue with parts P, Q, R and S marked

Part Function
P i. Perforated cells enabling the flow between the cells
Q ii. Provides metabolic support to the sieve tubes
R iii. Stores proteins and transports food material
S iv. Provides support

(a) P–i, Q–ii, R–iii, S–iv
(b) P–iii, Q–ii, R–iv, S–i
(c) P–ii, Q–iv, R–iii, S–i
(d) P–iv, Q–ii, R–i, S–iii

Answer: (d) P–iv, Q–ii, R–i, S–iii
P is phloem fibre, which gives mechanical support. Q is the companion cell, which gives metabolic support to the sieve tube. R is the sieve tube, whose perforated end walls let food flow from cell to cell. S is phloem parenchyma, which stores food and proteins.

Q10. In the given image, X and Y represent the tubular cells of the xylem which are composed of dead cells. Which of the following features of these cells enables them to withstand the high hydrostatic pressure in these cells?
(a) Presence of pits
(b) Lignified cell walls
(c) Open ends
(d) Tube-like structures

Xylem tubular cells marked X and Y

Answer: (b) Lignified cell walls
The walls of xylem vessels and tracheids are thickened with a hard substance called lignin. This makes the walls strong and rigid, so the tubes do not collapse under the high pressure created when water is pulled up the plant.

Q11. Carefully observe the given figure showing complex permanent tissues. Identify the physiological process in the plant that would be affected in the absence of these tissues.
(a) Gaseous exchange
(b) Secretion of plant hormones
(c) Transportation of water and food
(d) Absorption of water

Complex permanent tissues: xylem and phloem in a plant

Answer: (c) Transportation of water and food
The complex permanent tissues shown are xylem and phloem. Xylem carries water and minerals from the roots to the leaves, and phloem carries the food made in the leaves to the rest of the plant. Without them the plant could not transport water and food.

Q12. Given below are sets of some plant tissues. Identify the set of only simple permanent tissues present in the plant.
I. Parenchyma, Sclerenchyma, Phloem
II. Parenchyma, Collenchyma, Sclerenchyma
III. Collenchyma, Xylem, Phloem
IV. Sclerenchyma, Collenchyma, Phloem
(a) I and II
(b) Only I
(c) II and IV
(d) Only II

Answer: (d) Only II
Simple permanent tissues are made of only one type of cell. Parenchyma, collenchyma and sclerenchyma are the three simple permanent tissues, so set II is correct. Xylem and phloem are made of several kinds of cells, so they are complex permanent tissues and the other sets are wrong.

Related Study Material on Extramarks

Q.1 Complete the given analogy.
Green revolution : Production of grains :: White revolution : _________

A. Production of milk

B. Production of rice

C. Production of tea

D. Production of fish

Marks:1
Ans

Production of milk

Q.2 What are the various methods of irrigation in India Why are irrigation systems needed in India

Marks:5
Ans

Various methods of irrigation in India are:
· Wells
· Canals
· River lift systems
· Tanks

India receives most of the water through rain. As rains are not predictable in India and also their distribution is irregular, farmers cannot depend on rains for irrigating the crops. Hence irrigation systems are necessary in India.

Q.3 Enlist the factors which affect the quality of honey.

Marks:2
Ans

The quality of honey is affected by various factors. These factors include:

  • The type of vegetation of plant, also known as pasturage
  • The types of flowers available for nectar
  • The types of pollen collected

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