CBSE Class 9 Science Chapter 03 Tissues In Action MCQs Set 03

Science Objective Questions and Answers: Chapter 03 Tissues In Action

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Question: In F. C. Steward's carrot experiment, phloem cells first lost their specialised form and regained the ability to divide before eventually forming a whole new plant. What term does the chapter use for this loss of specialisation and regaining of division ability?
A. Dedifferentiation
B. Totipotency
C. Differentiation
D. Redifferentiation
Show Answer & Explanation

Answer: (A) Dedifferentiation

Explanation:
The chapter describes this step as dedifferentiation, where a mature cell reverts to an unspecialised, dividing state. Totipotency instead refers to the overall ability of such a cell to eventually regrow an entire organism.

Question: Looking at the internal structure of a sunflower stem shown in the chapter, which sequence correctly represents the tissue layers from the outermost surface going inward?
A. Epidermis, collenchyma, parenchyma, sclerenchyma, phloem, xylem
B. Xylem, phloem, sclerenchyma, parenchyma, collenchyma, epidermis
C. Epidermis, sclerenchyma, collenchyma, xylem, phloem, parenchyma
D. Parenchyma, epidermis, phloem, collenchyma, sclerenchyma, xylem
Show Answer & Explanation

Answer: (A) Epidermis, collenchyma, parenchyma, sclerenchyma, phloem, xylem

Explanation:
• The outermost boundary is the protective epidermis with its cuticle.
• Just beneath lies the ground tissue, starting with flexible collenchyma and then parenchyma.
• A ring of tough sclerenchyma follows, giving mechanical strength.
• The vascular bundles with phloem lying outside and xylem lying inside are innermost.

Question: Apart from cutting down water loss during transpiration, what other protective role does the waxy cuticle covering plant epidermis serve, as described in the chapter?
A. It shields the plant from mechanical injury and invasion by parasites
B. It speeds up the rate of photosynthesis in leaves
C. It allows minerals to be absorbed directly from the air
D. It helps guard cells open and close stomata faster
Show Answer & Explanation

Answer: (A) It shields the plant from mechanical injury and invasion by parasites

Explanation:
The cuticle is not just a barrier against water loss; the text notes it also guards the plant surface against physical damage and attack by parasitic organisms.

Question: According to the chapter, why does the evaporation of water vapour through leaf stomata, known as transpiration, matter for a tall plant?
A. It generates a pull that helps draw water upward through the xylem
B. It converts absorbed water directly into starch for storage
C. It causes lignin to be deposited in the cell walls of leaves
D. It triggers the lateral meristem to divide more rapidly
Show Answer & Explanation

Answer: (A) It generates a pull that helps draw water upward through the xylem

Explanation:
Water lost through the stomata creates a transpiration pull that draws the water column upward inside xylem vessels, helping it reach even the topmost leaves against gravity.

Question: In the chapter's description of stem growth, what exactly does the term 'internode' mean?
A. The stretch of stem lying between two successive nodes
B. The point on a stem where a leaf or branch arises
C. The dividing tissue found at the very tip of a shoot
D. The ring of cells that runs around the circumference of a stem
Show Answer & Explanation

Answer: (A) The stretch of stem lying between two successive nodes

Explanation:
A node is where leaves or branches attach to a stem, and the segment of stem in between two such nodes is called the internode.

Question: Which of the following best captures the role of the dermal tissue system in a plant's body?
A. It forms the outer covering that shields inner tissues and limits water loss
B. It fills the bulk of the plant body lying between skin and conducting tissue
C. It transports water and food to every part of the plant
D. It generates fresh cells that make roots and shoots grow longer
Show Answer & Explanation

Answer: (A) It forms the outer covering that shields inner tissues and limits water loss

Explanation:
Of the three tissue systems, the dermal system is the outer covering meant for protection and reducing moisture loss, distinct from the ground tissue system that fills the interior and the vascular system that handles transport.

Question: The ground tissue system, positioned between the outer dermal covering and the vascular tissue of a plant, is made up of which combination of tissues?
A. Parenchyma, collenchyma and sclerenchyma
B. Xylem, phloem and cambium
C. Epidermis, cuticle and stomata
D. Tracheids, vessels and sieve tubes
Show Answer & Explanation

Answer: (A) Parenchyma, collenchyma and sclerenchyma

Explanation:
This tissue system forms the main body mass of the plant and includes the three simple permanent tissues, whereas xylem and phloem belong to the separate vascular tissue system.

Question: As a plant stem grows older, some cells beneath the young epidermis start dividing and give rise to the cork cambium. What does this cork cambium eventually produce?
A. Bark, made of dead, tightly packed cells impermeable to water and gases
B. Fresh root hairs to increase mineral absorption
C. New xylem vessels to replace worn-out ones
D. Guard cells that regulate the opening of stomata
Show Answer & Explanation

Answer: (A) Bark, made of dead, tightly packed cells impermeable to water and gases

Explanation:
Cork cambium acts as a lateral meristem that produces cork cells, and these dead, compactly arranged cells with a waterproofing substance eventually form the tree's bark, replacing the single-layered epidermis seen in young plants.

Question: What structural feature allows epithelial cells lining glands such as the salivary or sweat glands to carry out their secretory role effectively?
A. Cells shaped as cuboidal or columnar, specialised to produce and release substances
B. A single layer of thin, flat cells suited for rapid diffusion
C. Multiple stacked layers of flattened, tightly packed cells
D. Tall, pillar-like cells bearing hair-like structures for absorption
Show Answer & Explanation

Answer: (A) Cells shaped as cuboidal or columnar, specialised to produce and release substances

Explanation:
Secretory epithelium is built from cuboidal or columnar cells adapted for manufacturing and releasing substances like mucus, enzymes or sweat, unlike the flat cells used for exchange or the layered cells used for protection.

Question: Specialised epithelial cells bearing hair-like cilia, which help detect smell, taste, sound and balance, are found lining which body structures?
A. Nostrils, taste buds and the inner ear
B. Blood vessels and the lungs
C. The skin and oesophagus
D. The lining of the small intestine
Show Answer & Explanation

Answer: (A) Nostrils, taste buds and the inner ear

Explanation:
These sensory receptor cells with cilia are positioned in the nose, mouth and ear, allowing them to pick up smell, taste, and sound or balance signals respectively.

Question: Which description correctly matches the type of muscle responsible for slow, involuntary movements such as pushing food through the intestines?
A. Spindle-shaped cells with a single nucleus and no visible striations
B. Long, cylindrical, multinucleate cells showing clear striations
C. Branched, cylindrical fibres with faint striations and a single nucleus
D. Flat, thin cells arranged in a single tightly packed layer
Show Answer & Explanation

Answer: (A) Spindle-shaped cells with a single nucleus and no visible striations

Explanation:
This matches smooth muscle, found in organs like the stomach and intestines, distinguishing it from the striated, multinucleate skeletal muscle and the branched cardiac muscle.

Question: Within the structure of a neuron, which part carries messages away from the cell body toward the axon terminals?
A. Axon
B. Dendrite
C. Cell body
D. Nucleus
Show Answer & Explanation

Answer: (A) Axon

Explanation:
Dendrites bring signals in from other neurons, while the axon is the long fibre that conducts the impulse outward to the terminals where it passes on to the next cell.

Question: Which statement about the human rib cage matches what the chapter describes?
A. It has 12 pairs of ribs joined to the spine and sternum by flexible cartilage
B. It has 10 pairs of ribs that are completely immovable
C. Ribs attach only to the backbone and hang freely at the front
D. Ribs are joined by fixed joints, so the chest cannot expand during breathing
Show Answer & Explanation

Answer: (A) It has 12 pairs of ribs joined to the spine and sternum by flexible cartilage

Explanation:
• The chapter states there are 12 pairs of ribs forming the rib cage.
• They connect to the spine at the back and to the sternum in front.
• Flexible cartilage at these joints lets the cage expand and contract while breathing.

Question: Why is 21st June observed each year, according to the chapter's discussion of physical health practices?
A. As International Yoga Day, to highlight yoga's role in health and well-being
B. As the anniversary of the discovery of totipotency in carrot cells
C. As World Tissue Culture Day, celebrating plant tissue research
D. As the date of the first successful bone marrow transplant
Show Answer & Explanation

Answer: (A) As International Yoga Day, to highlight yoga's role in health and well-being

Explanation:
The chapter links this date to International Yoga Day, noting that yoga practices are recognised for improving flexibility, posture, breathing and stress management.

Question: How does an amoeba, being a unicellular organism, manage life processes such as feeding, movement and reproduction without having any distinct tissues?
A. A single cell within it performs all the functions needed for life
B. It builds simple tissues resembling plant meristem for division of labour
C. It relies on epithelial-like cell layers for protection and locomotion
D. It distributes tasks among a small number of specialised cell groups
Show Answer & Explanation

Answer: (A) A single cell within it performs all the functions needed for life

Explanation:
Unlike multicellular organisms where different tissues share the workload, an amoeba is a single cell that alone carries out every life function, from feeding to movement.

Question: Which of these best matches how the chapter defines a tissue?
A. A single cell that carries out every function needed for survival
B. A collection of different organs working towards one common goal
C. A group of cells similar in structure that work together to perform a specific function
D. Any new structure that appears after a cell divides
Show Answer & Explanation

Answer: (C) A group of cells similar in structure that work together to perform a specific function

Explanation:
A tissue is described as cells of similar structure grouped together to carry out one particular job, which is different from a single cell doing everything (that describes unicellular organisms like amoeba) or organs working together (that describes an organ system).

Question: The chapter points out that most animals can move about, but it names one exception that stays fixed in place. Which organism is this exception?
A. Amoeba
B. Sponges
C. Onion
D. Sunflower
Show Answer & Explanation

Answer: (B) Sponges

Explanation:
Sponges are given as an example of animals that remain immobile despite belonging to the animal kingdom, unlike most other animals whose flexible, wall-less cells suit them for locomotion.

Question: Besides carrying water and minerals upward, what other job does xylem tissue perform for a plant?
A. It provides mechanical strength to the plant besides transporting water
B. It stores starch and other food reserves for later use
C. It produces hormones that regulate flowering
D. It carries oxygen absorbed through stomata to growing tissues
Show Answer & Explanation

Answer: (A) It provides mechanical strength to the plant besides transporting water

Explanation:
Since tracheids, vessels and xylem fibres in xylem are mostly sclerenchymatous with thick walls, this tissue doubles up as a support structure in addition to its transport role.

Question: What function does phloem parenchyma perform within the conducting tissue of a plant?
A. Transporting water and dissolved minerals upward from the roots
B. Monitoring the loading and unloading of sugars into sieve tubes
C. Storing food materials along with substances such as resin, tannins and latex
D. Providing rigidity to the stem through lignin deposition
Show Answer & Explanation

Answer: (C) Storing food materials along with substances such as resin, tannins and latex

Explanation:
• Phloem parenchyma cells act as storage sites within the vascular tissue.
• They hold food reserves and also substances like resin, tannin and latex.
• This is distinct from the companion cells, which instead regulate sugar loading and unloading in sieve tubes.

Question: What structural feature of sieve tube cells allows food to flow continuously from one cell to the next?
A. Cells joined end to end with perforated walls that allow continuous flow
B. Cells with thick lignified walls that make them completely rigid
C. Cells containing large air spaces for buoyancy
D. Cells covered externally by a waxy cuticle layer
Show Answer & Explanation

Answer: (A) Cells joined end to end with perforated walls that allow continuous flow

Explanation:
Sieve tube cells are long and tubular, connected end to end through perforated walls called sieve plates, forming a continuous channel through which food moves from the leaves to other parts of the plant.

Question: Which description correctly matches the structure and location of cardiac muscle?
A. Spindle-shaped cells with a single nucleus and no visible striations, found in the stomach wall
B. Cylindrical, branched fibres with a single nucleus and faint striations, found only in the heart
C. Long, unbranched, multinucleate fibres with clear striations, attached to the skeleton
D. Star-shaped cells with a nucleus, dendrites and a long axon
Show Answer & Explanation

Answer: (B) Cylindrical, branched fibres with a single nucleus and faint striations, found only in the heart

Explanation:
Cardiac muscle is unique to the heart and made of branched, cylindrical fibres with a single nucleus and only faint stripes, an arrangement that lets the heart contract rhythmically for a lifetime without tiring.

Question: The knee functions like a hinge joint, similar to the elbow. Which small bone at the knee gives it extra protection?
A. Collarbone
B. Sternum
C. Kneecap
D. Vertebra
Show Answer & Explanation

Answer: (C) Kneecap

Explanation:
The kneecap sits over the knee's hinge joint to shield it, much as the sternum protects organs in the chest and the collarbone supports the shoulder region elsewhere in the skeleton.

Question: According to the chapter, what actually happens when a skeletal muscle attached to a bone contracts?
A. The ligament stretches to absorb the pulling force generated
B. The tendon transmits the force of contraction to the bone, producing movement at the joint
C. The cartilage compresses to cushion the bone against sudden force
D. Stem cells in the bone marrow are released to repair the strained bone
Show Answer & Explanation

Answer: (B) The tendon transmits the force of contraction to the bone, producing movement at the joint

Explanation:
Muscles cannot move bones directly; they are anchored to bones through tendons, and it is this tendon that carries the pulling force generated during contraction to the bone, causing motion at the joint.

Question: In F. C. Steward's carrot cell culture experiment, under which combination of growing conditions did the cultured cells show a rise in fresh weight?
A. Solid medium with light but without air
B. Liquid medium with light and air
C. Liquid medium with air but without light
D. None of the combinations led to any increase in weight
Show Answer & Explanation

Answer: (B) Liquid medium with light and air

Explanation:
• The data table records three tested conditions.
• Solid medium without air, and liquid medium without light, both caused the cells' weight to fall.
• Only the liquid nutrient medium supplied with both light and air produced a rise in fresh weight, showing all three factors mattered together.

Question: How do tendons and ligaments differ from each other in their role within the musculoskeletal system?
A. Tendons join bone to bone, while ligaments join muscle to bone
B. Tendons join muscle to bone, while ligaments join bone to bone
C. Both connect muscle to muscle but at different joints
D. Tendons are found only in the heart, while ligaments are found in all other muscles
Show Answer & Explanation

Answer: (B) Tendons join muscle to bone, while ligaments join bone to bone

Explanation:
Tendons transmit the pull of a contracting muscle onto a bone to create movement, whereas ligaments hold bone to bone at a joint, limiting movement and preventing dislocation.

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