Tissues in Action — Class 9 MCQs with Answers

Tissues in Action — important questions & MCQs with answers (Class 9 Science)

6 solved questions from this chapter's difficulty levels, each with its answer and explanation. Tap an option to check yourself.

0 of 6 answered

1. Q1 of 6Easy

   Tissues responsible for plant growth are:

   APermanent tissuesBConducting tissuesCMeristematic tissuesDEpidermal tissues
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   Answer: Meristematic tissues

   Explanation: Meristematic tissue consists of continuously dividing cells at root and shoot tips, driving new growth; permanent tissues have already differentiated and lost the ability to divide.

2. Q2 of 6Easy

   Tissue lining the inner surface of body cavities is:

   AConnective tissueBEpithelial tissueCMuscle tissueDNervous tissue
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   Answer: Epithelial tissue

   Explanation: Epithelial tissue forms a continuous, tightly packed sheet lining body cavities and organ surfaces, acting as a protective barrier; connective tissue instead fills spaces and binds structures together.

3. Q3 of 6Medium

   Xylem transports:

   AOxygenBFood downwardsCHormonesDWater and minerals upwards
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   Answer: Water and minerals upwards

   Explanation: Xylem's dead, hollow tracheids and vessels form continuous tubes that pull water and dissolved minerals upward from roots to shoots, while phloem separately carries food.

4. Q4 of 6Medium

   Assertion (A): The rib cage can expand and contract during breathing. Reason (R): The ribs are joined by flexible cartilage.

   ABoth A and R are true and R is the correct explanation of ABBoth A and R are true but R is not the correct explanation of ACA is true but R is falseDA is false but R is true
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   Answer: Both A and R are true and R is the correct explanation of A

   Explanation: Both statements are true. The flexible cartilage joining the ribs lets the rib cage move and change the space in the chest, so R explains A.

5. Q5 of 6Hard

   Which plant tissue provides mechanical strength and is found in shells of nuts?

   AParenchymaBSclerenchymaCCollenchymaDPhloem
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   Answer: Sclerenchyma

   Explanation: Sclerenchyma's thick, lignified walls make it hard and rigid, which is why it forms the tough shells of nuts and gives plants mechanical strength.

6. Q6 of 6Hard

   Assertion (A): The bones of the skull cannot move. Reason (R): The skull is connected to the backbone by a pivot joint that lets the head move from side to side.

   ABoth A and R are true and R is the correct explanation of ABBoth A and R are true but R is not the correct explanation of ACA is true but R is falseDA is false but R is true
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   Answer: Both A and R are true but R is not the correct explanation of A

   Explanation: Both statements are true. The skull bones cannot move because they are joined by fixed joints; the pivot joint lets the whole head turn, so R does not explain A.

Tissues in Action notes: key concepts (Class 9 Science)

In multicellular organisms groups of similar cells specialise into tissues, dividing the work of the body. This chapter covers the meristematic and permanent tissues of plants and the four types of animal tissue with their locations and functions.

Tissue

A group of cells similar in structure and origin that work together to perform a particular function.

Division of labour

The specialisation of different tissues for different jobs, which makes multicellular organisms far more efficient than single cells.

Meristematic tissue

Plant tissue of actively dividing cells with thin walls, dense cytoplasm and no vacuoles, responsible for all growth.

Apical, lateral and intercalary meristem

Apical meristem increases length at root and shoot tips, lateral increases girth, and intercalary lies at the base of leaves or internodes.

Permanent tissue

Tissue formed when meristematic cells lose the ability to divide and take on a fixed shape, size and function.

Parenchyma

Simple permanent tissue of thin-walled living cells that stores food; chlorenchyma contains chlorophyll and aerenchyma has air cavities for buoyancy.

Collenchyma

Living cells thickened at the corners, giving flexibility so stems and leaf stalks can bend without breaking.

Sclerenchyma

Dead cells with thick lignified walls that make the plant hard and stiff, as in the husk of a coconut.

Xylem

Complex plant tissue conducting water and minerals upward, made of tracheids, vessels, xylem parenchyma and fibres; mostly dead at maturity.

Phloem

Complex plant tissue translocating food, made of sieve tubes, companion cells, phloem parenchyma and fibres; mostly living.

Epithelial tissue

The covering and lining tissue of the animal body, forming a barrier and regulating what passes across it.

Types of epithelium

Squamous for lining, cuboidal in kidney tubules, columnar for absorption and secretion, and ciliated for moving mucus.

Connective tissue

Tissue with cells widely spaced in a matrix, including blood, bone, cartilage, ligament, tendon and areolar and adipose tissue.

Muscular tissue

Contractile tissue producing movement — striated and voluntary in skeletal muscle, unstriated and involuntary in internal organs, and cardiac in the heart.

Nervous tissue

Tissue of neurons that receive and transmit impulses rapidly, allowing the animal to respond to stimuli.