Online Test: Tissues --- Plant and Animal | Class 9 Biology

Question 1 of 35

Which meristem is responsible for the growth of grass leaves after herbivore damage?

Apical meristem

Lateral meristem

Intercalary meristem

Permanent meristem

Explanation: Intercalary meristems are situated at internodes and leaf bases to help regenerate consumed plant parts.

Question 2 of 35

Active cell division is the main feature of which of the following tissues?

Parenchyma

Sclerenchyma

Xylem

Meristem

Explanation: Meristematic cells are embryonic, immature cells dedicated exclusively to division.

Question 3 of 35

Growth in the girth of a stem takes place due to the activity of:

Lateral meristem

Apical meristem

Intercalary meristem

Vertical meristem

Explanation: Lateral meristems cause secondary radial thickening, increasing the trunk's girth.

Question 4 of 35

A feature absent in typical meristematic cells is the presence of:

Dense cytoplasm

Prominent nucleus

Large vacuoles

Thin cell wall

Explanation: Large vacuoles are absent because these cells don't store nutrients or waste products.

Question 5 of 35

Apical meristems are physically located at which of the following regions?

Outer bark

Growing root and shoot tips

Base of petioles

Cortex of roots

Explanation: Apical meristems occupy terminal points of roots and shoots to drive linear elongation.

Question 6 of 35

Which chemical substance is deposited uniformly in the cell walls of sclerenchyma, making them hard?

Cellulose

Pectin

Lignin

Suberin

Explanation: Lignin acts as a rigid, waterproof chemical cement that thickens sclerenchyma walls.

Question 7 of 35

Flexibility in plants is primarily provided by which of the following tissues?

Parenchyma

Collenchyma

Sclerenchyma

Chlorenchyma

Explanation: Collenchyma features localized pectic thickenings that grant tensile flexibility.

Question 8 of 35

Aerenchyma is a vital modification found predominantly within:

Xerophytes

Hydrophytes

Mesophytes

Halophytes

Explanation: Hydrophytes (aquatic plants) need aerenchyma for gas exchange and buoyancy.

Question 9 of 35

Which tissue has thin cell walls, large intercellular spaces, and is composed of living cells?

Sclerenchyma

Collenchyma

Parenchyma

Xylem Vessels

Explanation: Parenchyma cells remain unspecialized with thin cellulose walls and large intercellular gaps.

Question 10 of 35

The husk of a coconut is composed entirely of:

Parenchymatous cells

Sclerenchymatous fibers

Collenchymatous cells

Phloem fibers

Explanation: The tough, protective outer covering of a coconut consists of dead sclerenchyma fibers.

Question 11 of 35

Which of the following components of xylem tissue is living?

Tracheids

Vessels

Xylem parenchyma

Xylem fibres

Explanation: Xylem parenchyma cells retain their cytoplasm and nucleus, making them the only living cells in xylem.

Question 12 of 35

Sieve tubes and companion cells are characteristic components of:

Xylem

Phloem

Cambium

Epidermis

Explanation: Sieve tubes and companion cells work together to transport organic food in phloem tissue.

Question 13 of 35

The conduction of food through phloem tissue is described as:

Unidirectional

Bidirectional

Multidirectional

Radial only

Explanation: Phloem moves food bidirectionally, both upward toward growing buds and downward toward roots.

Question 14 of 35

Which cell type lacks a nucleus at functional maturity but remains living?

Companion cell

Sclerenchyma cell

Sieve tube cell

Xylem parenchyma

Explanation: Sieve tubes lose their nucleus at maturity to clear path for food conduction, but remain living.

Question 15 of 35

The structural elements of xylem that are long, hollow pipes with perforated end walls are:

Tracheids

Vessels

Sieve plates

Bast fibers

Explanation: Vessels are advanced, continuous tubes formed by cells joined end-to-end with perforated end walls.

Question 16 of 35

The epithelial tissue that forms the delicate lining of blood vessels and lung alveoli is:

Simple cuboidal

Simple squamous

Stratified columnar

Ciliated columnar

Explanation: Simple squamous epithelium is extremely thin and flat, making it ideal for diffusion and filtration.

Question 17 of 35

Hair-like projections on the outer surface of epithelial cells in the respiratory tract are called:

Microvilli

Flagella

Cilia

Stereocilia

Explanation: Cilia are hair-like projections that move mucus and trapped dust out of the respiratory tract.

Question 18 of 35

Skin cells are continuously subjected to wear and tear. Therefore, skin is composed of:

Simple columnar

Stratified squamous

Glandular epithelium

Simple cuboidal

Explanation: Stratified squamous epithelium consists of multiple layers to protect against friction and abrasion.

Question 19 of 35

Cells that are tall and pillar-like with nuclei located at the base belong to which tissue?

Cuboidal epithelium

Squamous epithelium

Columnar epithelium

Connective tissue

Explanation: Columnar epithelial cells are elongated vertically like columns, with their nuclei near the base.

Question 20 of 35

The non-cellular layer that separates epithelial tissue from underlying tissues is called the:

Plasma membrane

Cell wall

Basement membrane

Nuclear matrix

Explanation: The basement membrane is a non-cellular layer that anchors epithelium to connective tissue.

Question 21 of 35

Tendons are dense connective tissues that physically connect:

Bone to Bone

Muscle to Bone

Muscle to Muscle

Nerve to Muscle

Explanation: Tendons are tough, fibrous cords that attach skeletal muscles to bones.

Question 22 of 35

The liquid extracellular matrix of blood tissue is known as:

Serum

Lymph

Plasma

Cytoplasm

Explanation: Plasma is the fluid matrix of blood in which RBCs, WBCs, and platelets are suspended.

Question 23 of 35

Which tissue acts as a thermal insulator beneath the skin?

Areolar tissue

Cartilage

Epithelial tissue

Adipose tissue

Explanation: Adipose tissue contains fat cells that insulate the body and retain heat.

Question 24 of 35

Cells embedded in a hard matrix composed of calcium and phosphorus are:

Chondrocytes

Osteocytes

Axons

Fibroblasts

Explanation: Osteocytes are mature bone cells surrounded by a rigid matrix of calcium and phosphorus.

Question 25 of 35

Cartilage is found in several parts of the human body, except the:

Pinna of ear

Nose tip

Trachea

Kidney

Explanation: Cartilage provides flexible support in the ear, nose, and trachea, but is absent in kidneys.

Question 26 of 35

Which type of muscle tissue exhibits long, cylindrical, unbranched, and multinucleated fibers?

Smooth muscle

Cardiac muscle

Striated muscle

Dense regular muscle

Explanation: Striated skeletal muscles are voluntary fibers characterized by multiple peripheral nuclei and an unbranched structure.

Question 27 of 35

The specialized cellular junctions found exclusively in cardiac muscle cells are called:

Synapses

Intercalated discs

Sieve plates

Tight junctions

Explanation: Intercalated discs link cardiac cells together, allowing electrical signals to spread quickly for coordinated contractions.

Question 28 of 35

Which of the following organs is composed predominantly of involuntary, unstriated smooth muscle?

Biceps

Heart

Wall of intestine

Tongue

Explanation: The internal walls of visceral organs like the stomach and intestines are lined with smooth muscle.

Question 29 of 35

Muscle fatigue is caused by the accumulation of which chemical substance during heavy exercise?

Pyruvic acid

Lactic acid

Carbonic acid

Acetic acid

Explanation: Intense anaerobic exercise causes skeletal muscles to produce lactic acid, which leads to muscle fatigue.

Question 30 of 35

Contractile proteins present in muscle fibers are:

Hemoglobin & Myoglobin

Actin & Myosin

Collagen & Elastin

Keratin & Melanin

Explanation: Actin and myosin are the primary contractile proteins that slide past each other to shorten and lengthen muscles.

Question 31 of 35

The functional unit of the nervous system that conducts electrical impulses is the:

Nephron

Neuron

Axon

Glial cell

Explanation: Neurons are the structural and functional units of nervous tissue specialized for communication.

Question 32 of 35

Which part of the neuron receives incoming signals from other cells?

Axon

Myelin sheath

Dendrite

Nerve ending

Explanation: Dendrites are short, branching projections that receive signals and carry them toward the cell body.

Question 33 of 35

The insulating fatty layer that covers many long axons is called the:

Sarcolemma

Myelin sheath

Plasma membrane

Neurilemma

Explanation: The myelin sheath acts as electrical insulation around axons to speed up impulse transmission.

Question 34 of 35

Glial cells are specialized cells in nervous tissue that function to:

Conduct rapid impulses

Pump blood

Support and protect neurons

Store fat reserves

Explanation: Glial cells do not transmit impulses; they support, insulate, and nourish nearby neurons.

Question 35 of 35

The microscopic gap between two neighboring neurons is known as a:

Synapse

Node of Ranvier

Sieve plate

Intercalated disc

Explanation: A synapse is the microscopic gap where chemical signals pass information from one neuron to the next.

Online Test — Tissues --- Plant and Animal