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CBSE Questions for Class 9 Biology Tissues Quiz 3 - MCQExams.com
CBSE
Class 9 Biology
Tissues
Quiz 3
Voluntary muscles are found in___________________.
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Alimentary canal
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Limbs
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Iris of the eye
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Bronchi of lungs
Explanation
A voluntary muscle often called as a skeletal muscle, is one of three types of muscle in the body. Most voluntary muscles are used to move bones, though some, such as the muscles in the face, are used to create movements below the skin. Unlike cardiac or smooth muscle, these muscles can be controlled by the conscious mind.
Alimentary canal, bronchi of lungs and iris in the eye are made up of involuntary muscles.
So, the correct answer is option B.
Shivering, when in cold water is caused by
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Voluntary action of striated muscles
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Voluntary action of unstriated muscles
0%
Involuntary action of striated muscles
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Involuntary action of unstriated muscles
Explanation
The muscles are capable of utilizing only about 20% to 40% of energy in their mechanical work, liberated from glucose. The unutilized energy is lost as 'heat' dissipated into the environment. This heat helps in maintenance of body temperature.
Shivering with colds in winters is caused by a quick involuntary reaction of striated muscles. It yields some heat just to warm the body.
Thus, the correct answer is option C.
Nissl granules are absent in
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Axon
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Cyton
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Dendron
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Both A and B
Explanation
Correct option: A
Explanation:
Nissl granules are absent in Axon.
The neuron is made up of a cell body (cyton), dendrites (dendron), axons and axon terminals. Nissl granules are discrete structures, which consist rough endoplasmic reticulum and free ribosomes. It is the main site for synthesize of proteins in neurons.
These are found in somata and dentrites region of the neuron, and not in the axon or axon hillock regions.
Thus, Option A is correct.
There is no DNA in :
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Hair root
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An enucleated ovum
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Mature RBCs
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A mature spermatozoan
Explanation
Correct Option: C
Explanation:
Although RBCs are considered cells, they lack a nucleus, nuclear DNA, and most organelles, including the endoplasmic reticulum and mitochondria. RBCs therefore cannot divide or replicate like other labile cells of the body. They also lack the components to express genes and synthesize proteins. Hence, they are called, Akaryotes.
Which of the following muscles act involuntarily?
(i) Smooth muscles
(ii) Cardiac muscles
(iii) Skeletal muslces
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(i) and (ii)
0%
(ii) and (iii)
0%
(iii) and (i)
0%
(i), (ii) and (iii)
Explanation
Smooth muscles are located in visceral organs of the body. For example, urinary bladder, uterus, respiratory tract, etc. They are involuntary muscles. Similarly, Cardiac muscles are present in heart and help in rhythmic contraction and relaxation of auricles and ventricles. This movement of the heart cannot be controlled by the human body, thus are termed as involuntary movements.
In contrast, skeletal muscles are attached to bones which function in bodily movements like, walking, running, etc. These are voluntary movements since they are in direct control of an individual.
Hence the correct option is A.
Fats are stored in human body as_________________.
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Cuboidal epithelium
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Adipose tissue
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Bones
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Cartilage
Explanation
$$\textbf{Correct option:}$$ Option B
$$\textbf{Explanation for correct option:}$$
Option B
$$\bullet$$ Adipose tissue are f
at-storing tissues
found below the skin
and between internal organs.
$$\bullet$$
Their cells
are filled with fat globules and
act as an insulator.
$$\textbf{Explanation for incorrect options: }$$
Option A
: Cuboidal epithelium cells are cube-shaped
cells that
provide
mechanical support. They
form the lining of kidney tubules and
ducts of salivary glands.
Option C:
Bone is connective
tissue. It forms the framework that supports
the body. It also anchors the muscles and
supports the main organs of the body.
Option D:
Cartilage is a connective tissue that has widely spaced cells. They have a solid
matrix composed of proteins and sugars.
They smoothen the bone surfaces at joints.
$$\textbf{Conclusion:}$$ Thus, fats are stored in the human body as adipose tissue.
In desert plants, rate of water loss is reduced due to the presence of
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Cuticle
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Stomata
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Lignin
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Suberin
Explanation
The epidermis of desert plants has a thick layer of cutin that is called cuticle. It is a waxy layer present on the leaves whose primary function is to reduce the water loss from the plant.
Hence the correct option is A.
Jumping of a frog is regulated by_______________________.
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Voluntary muscle
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Involuntary muscle
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Tendons
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Both A and B
Explanation
Jumping of a frog is a body movement. Body movement is carried out by muscles, which are attached to bones. Such muscles are called skeletal muscles. These muscles can be controlled by the organism's will. Hence, they are voluntary muscles. So, the correct answer is option A.
Which structure protects the plant body against the invasion of parasites?
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Waxy substances on epidermis called cuticle.
0%
Glue like substances on epidermis
0%
Lignin
0%
None of the above
Explanation
The cuticle covering the epidermis protects the plant body against the invasion of parasites and other harmful agents. Epithelial tissue is the protective covering of the body.
So, the correct answer is option A.
The muscle type which functions throughout life continuously without fatigue is_____________________.
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Skeletal muscle
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Cardiac muscle
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Smooth muscle
0%
All of the above
Explanation
Cardiac muscle can function without fatigue and with efficiency throughout life in an individual by themselves.
So, the correct answer is option B.
A rare plant in a botanical garden has been infected with specific fungi that feed on sugar molecules. After careful examination, a botanists suggested the following surgical intervention to get rid of the fungi and prevent its spread to apical portions: removing the infected portion so that a ring of bark about 2 inches in height and about 1-2 cms wide is removed. This will remove the cambial cells, phloem, endodermis, cortex and epidermis of the stem. Which of the following will be a consequence of such a surgical intervention?
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Flow of food will be affected but flow of water upwards will be maintained.
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Flow of water upward will be lost but flow of food will be maintained.
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Both flow of food and water upward will be lost
0%
Neither the flow of food nor water movement will be affected.
Difference between voluntary and involuntary muscles is
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Voluntary muscles can be moved by conscious will while involuntary muscles function on their own.
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Voluntary muscles are muscles of limbs or skeletal muscles while involuntary muscles are cardiac muscles and smooth muscles.
0%
Both A and B
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Voluntary muscles are control the function of heart and involuntary muscles controls the movement of arms.
Explanation
Muscle tissue is made up of elongated muscle fibres. Muscles that are under the control of our will are voluntary muscles. Such muscles are attached to bones hence, called skeletal muscles. These muscles help in body movement. These muscles, when stained, show alternate light and dark bands under the microscope. Therefore, also called striated muscles.
Muscles, which are not controlled by our will are involuntary muscles. These muscles do not show striations when stained. Hence, called smooth muscles. Cardiac muscle is also a special type of muscle, which is involuntary. The function of the heart is under involuntary muscles.
So, the correct answer is option C.
Which of the following helps in repair of tissue and fills up the space inside the organ?
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Tendon
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Adipose tissue
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Areolar
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Cartilage
Explanation
Areolar tissue helps in the repair of tissue and fills up space inside the organ.
The ground substance of areolar tissue fills all of the spaces between the cells and fibres.
It is found in many locations around the body.
The areolar tissue located on the skin binds the outer layers of the skin to the muscles beneath.
So, the correct answer is option C.
Cork cells posses ...................... on their walls that makes them impermeable to gases and water.
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Suberin
0%
Lignin
0%
Pectin
0%
Hemicellulose
Explanation
Lignin and Pectin are impermeable to water but are absent in cork cells.
Hemicellulose is permeable to water and gases.
Cork cells are dead and have cell walls composed of a waxy substance "suberin", which is highly impermeable to gases and water. This substance prevents water loss from the stem.
So, the correct answer is option A.
Lining of blood vessels is made up of
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Squamous epithelium
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Cuboidal epithelium
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Columnar epithelium
0%
None of the above
Explanation
Correct Option: A
Explanation:
All blood vessels are lined by simple squamous epithelium called the endothelium.
A simple squamous epithelium may be a single layer of flat cells in touch with the basal lamina (one of the 2 layers of the basement membrane) of the epithelium. This sort of epithelium is usually permeable and present where small molecules get to pass easily through membranes via filtration or diffusion.
The water conducting tissue generally present in gymnosperm is____________.
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Vessels
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Sieve tube
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Tracheids
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Xylem fibres
Explanation
$$\textbf{Correct Option C}$$
$$\textbf{Solution}$$
$$\bullet$$
Gymnosperms are vascular plants having naked seeds. They have vascular system for the transport of food and water.
$$\bullet$$
The water conducting tissue present in gymnosperm is known as tracheid they are the main water conducting elements and provide structural support to the plant.
$$\bullet$$
Gymnosperms lacks xylem vessels as well as companion cells but have tracheid for water transport.
$$\bullet$$
So, the correct option is C.
Why is epidermis important for the plants?
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It gives protection
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It helps in gaseous exchange
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It checks water loss
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All of the above
Explanation
Epidermis is the outermost layer of the plant body. It carries out the following functions:
1. It covers the body from outside and protects them from pathogen attack and atmospheric changes.
2. It bears stomata which are involved in gaseous exchange (oxygen, carbon dioxide) with the atmosphere. It also has lenticels on the woody stem for gaseous exchange.
3. The stomata present on leaves are also involved in transpiration (water evaporation from plant body). Stomata are guarded by guard cells, which close and open the stomata as per requirement. Therefore, epidermis bearing stomata also checks water loss from the plant body.
4. The epidermis is protected by cuticle at some parts of the tree and it helps to stop water loss by evaporation.
Hence the correct option is D.
In a neuron, conversion of electrical signal to a chemical signal occurs at
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Cell body
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Axonal end
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Dendritic end
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Axon
Explanation
Signals are transferred from one neuron to another.
The electrical signals are very fast as compared to that of chemical signals. Myelinated sheath present on the surface of neurons helps in better conduction of signals.
At the end of the axon (axonal end),
the electrical signal
is
converted into
a
chemical
signal, and the axon releases
chemical
messengers called neurotransmitters (acetylcholine) which are received by their receptors on the dendrites of the subsequent neuron. This region is called synapse.
So, the correct answer is '
Axonal end'
Which of the following cells contain the same kind of cell as shown in the figure given below?
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A sperm cell
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A cheek cell
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A nerve cell
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A blood cell
Explanation
The given image represents the cheek cell. It is a squamous epithelial cell in which there is a cell membrane, which acts as the outer protective covering. There is a single nucleus at the center and there is dense cytoplasm.
Thus, the correct answer is option B.
Which of the following are found in the blood but not in the lymph?
P - Lymphocytes
Q - Erythrocytes
R - Platelets
S - Plasma proteins
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P, Q, and R only
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P, Q, and S only
0%
P, R, and S only
0%
Q, R, and S only
Explanation
Blood and lymph both are fluid tissue that helps in transportation and immunity respectively. Blood consists of plasma and cells such as WBC, RBC, platelets, and plasma proteins. On the other hand, lymph contains salt, water, fat, and WBC. Lymphocytes are a type of white blood cells. Thus, the correct answer is option D.
Which of the following types of tissues support, defend and store food in the body?
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Epithelial tissue
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Nervous tissue
0%
Muscular tissue
0%
Connective tissue
Explanation
Blood, bone, tendon, cartilage, ligament, areolar tissue and adipose tissue are various types of connective tissue. Blood is a fluid connective tissue that consists of WBCs that form the body's immune system. Bone, cartilage, tendon and ligament have supportive functions while the areolar tissue supports internal organs and helps in their repair. Adipose tissues store food and fats.
Thus, the correct answer is option D.
Mature cork cells are
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Dead
0%
Living
0%
Transparent
0%
None of these
Explanation
Cork is a non-living (dead), water-resistant and protective tissue. It is present at the periphery of the bark. During the secondary growth phase, when the plant starts increasing stem diameter , cork displaces the epidermis layer of the stem.
Hence, option A is correct.
Simple epithelium is made up of
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Non cellular layer of hyauronic acid
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Actively dividing cells
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Loosely arranged cells
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Compactly packed single layer of cells
Explanation
Simple epithelium is one cell thick, i.e., every cell is in direct contact with the underlying basement membrane. It consists of compactly packed cells. In general, it is found where absorption and filtration occur.
Hence the correct option is D.
Identify the type of muscle given in the figure.
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Skeletal muscle
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Visceral muscle
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Cardiac muscle
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Smooth muscle
Explanation
Visceral muscles are also called smooth muscles they are not striated, not branched, and singly nucleated.
Skeletal muscles are striated, not branched, and multinucleated.
Whereas, the figure shows
uninucleated,
striated and branched muscle.
This type of muscle is found in the heart and is known as cardiac muscle.
Hence, the given image is of cardiac muscle.
Thus, the correct answer is option C.
Which of the following cells are not produced in the bone marrow of humans?
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Neurons
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Leucocytes
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Erythrocytes
0%
Monocytes
Explanation
Neurons are the cells of the nervous system which are present in the brain and the spinal cord. Bone marrow is the site which is responsible for the production of many different types of cells. The blood cells like the erythrocytes, leucocytes and the monocytes are synthesized by the bone marrow.
Thus, the correct answer is option A.
Which set identifies skeletal muscles?
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Cylindrical, multinucleated and unbranched
0%
Spindle, unbranched and multinucleated
0%
Cylindrical, striped and uninucleated
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Cylindrical, striped and branched
Explanation
Smooth muscle tissue cells
: they are involuntarily controlled, spindle-shaped, not striated, not branched, and
uninucleated.
Cardiac muscle tissue cells
: they are involuntary and intrinsically controlled, striated, branched, and single nucleated.
Skeletal muscle tissue cells
: they are voluntary, cylindrical in shape, striated, unbranched, and multinucleated.
Therefore, option A is correct.
The role of the axon is to
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Integrate signals from the dendrites
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Release neurotransmitter
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Conduct the impulse to the synaptic terminal
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Synthesize cellular components
Explanation
An axon also known as a nerve fibre, is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body. The function of the axon is to transmit information to different neurons, muscles and glands. The space between two neuron is known as synapse. The nerve impulse is transmitted towards the synaptic terminal from the dendron.
Hence the correct option is C.
The process of formation of blood corpuscles is called
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Haemopoiesis
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Hemolysis
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Hemozoin
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All of the above
Explanation
Haemolysis is the destruction of red blood cells.
Hemozoin is a waste product formed by the digestion of blood by some blood-feeding organisms. Malaria parasites are one of the examples of such blood-feeding organisms.
Haemopoiesis is the formation of blood cells in a living body. This process mainly takes place in the bone marrow.
Therefore, option A is correct.
Statements (A, B, C, D) in List I have to be matched with statements (p, q, r, s) in List II.
List I
List II
A
Cyton
p
The body of the nerve cell that contains the organelles.
B
Dendrite
q
Receives the stimuli sent from another nerve or the outside environment.
C
Axon
r
A fatty substance that covers the axon of the nerve cell and speeds.
D
Myelin sheath
s
The long, thin section of the nerve cell where the impulse is transmitted across.
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A- p, B- q, C- s, D- r
0%
A- r, B- q, C- s, D- p
0%
A- r, B- s, C- q, D- p
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A- r, B- s, C- p, D- q
Explanation
Cyton is the cell body of the neuron. It contains the nucleus.
Dendrites are the cellular extension from the cyton. They receive stimulus, which may be physical, chemical, mechanical or electrical, and passes it on to the cyton.
Axons are also known as nerve fibres which are a projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body.
Myelin sheath is also known as the medullary sheath. It is the envelope of myelin that surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses, formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells.
So, the correct answer is option C.
The .................... of the neuron secretes the substance named neurotransmitter.
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Axon
0%
Dendron
0%
Schwann cell
0%
None of the above
Explanation
The axon of the neuron secretes the substance named neurotransmitter to communicate with next dendrite. They are stored within synaptic vessicles.
Neurotransmitters help in the chemical transmission of impulse and they may be excitatory or inhibitory.
Hence the correct option is A.
Which of the following is an epidermal cell?
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Guard cells
0%
Root hairs
0%
Trichome
0%
All of the above
Explanation
Epidermal cells form the outer covering or surface and are mainly involved in protection and secretion.
Guard cells, r
oot hairs, and t
richome are all modification of the epidermal cells.
(i) Root hair
Structure:
Unicellular hairs are the extensions of an epidermal cell of roots in the root hair zone.
Function:
It increases the surface area for absorption of water and minerals.
(ii)Trichomes
Structure:
These are epidermal cell modifications. There may be unicellular or multicellular.
Functions:
Secretion and protection
(iii) Guard cell
Structure:
These are bean-shaped cells present on the epidermis of the leaf.
Functions:
These regulate the opening and closing of stomatal pore.
Hence the correct option is D.
Erythropoiesis may be stimulated by the deficiency of
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Iron
0%
Oxygen
0%
Protein
0%
None of the above
Explanation
The process of formation of red blood cells is known as erythropoiesis. RBC help in oxygen transport and therefore RBC production is stimulated by oxygen deficiency
So, the correct answer is '
Oxygen'
Erythropoiesis may be stimulated by the deficiency of
Report Question
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Iron
0%
Oxygen
0%
Protein
0%
None of the above
Explanation
Erythropoiesis is the process whereby erythroid precursor cells proliferate and differentiate into RBCs. It is stimulated by the decrease in the level of oxygen in the blood, that is detected by the kidneys, which then secrete the hormone erythropoietin. Erythropoietin stimulates proliferation and differentiation of red cell precursors, which activates increased erythropoiesis in the haemopoietic tissues like bone marrow
So, the correct answer is '
Oxygen'
Volkmann canal interconnects
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Bone marrow
0%
3$$^{rd}$$ and 4$$^{th}$$ ventricle of brain
0%
Central canals and 4$$^{th}$$ ventricle
0%
Haversian canals
Explanation
Volkmann canal interconnects Haversian canals. Volkmann canals are also known as perforating holes .Volkmann canals are inside osteons. The Haversian canals, interconnect the latter with each other and the periosteum. They usually run at obtuse angles to the Haversian canals and contain anastomosing vessels between Haversian capillaries.
Hence the correct option is D.
Which blood cells transport oxygen?
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Red
0%
White
0%
Both A and B
0%
None of the above
Explanation
Erythrocytes or red blood cells (RBC) are the most abundant of all the cells in blood. A healthy adult man has, on an average, 5 millions to 5.5 millions of RBCs per cubic mm of blood. RBCs are formed in the red bone marrow in the adults. RBCs are devoid of nucleus in most of the mammals and are biconcave in shape. They have a red coloured, iron containing complex protein called haemoglobin, hence the colour and name of these cells. These molecules play a significant role in transport of
respiratory gases like oxygen and carbon dioxide.
Hence the correct option is A.
In comparison with other cells, nerve cells show a higher degree of
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Metabolism
0%
Growth
0%
Contractility
0%
Irritability
Explanation
Irritability or excitability is the ability of nerve cells to respond to environmental stimulus. Primary function of nerve cells is to generate sensory input in response to external and internal stimuli followed by integration of sensory information to generate motor output. Thus, nerve cells exhibit higher rate of irritability as compared to other cell types.
Therefore, the correct answer is option D.
Striated muscle fibres possess
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Longitudinal strips
0%
Oblique strips
0%
Transverse strips
0%
No strips
Explanation
Striated muscle fibres appear to have transverse strips when viewed under the microscope. This is because they show alternative transverse light and dark bands. Most striated muscles are attached to bones by tendons. They are also called skeletal muscles.
Striations appear in skeletal muscles due to ________.
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Presence of alternate light and dark bands
0%
Presence of many fibres
0%
Presence of many blood vessels
0%
Compactly arranged muscle fibres
Explanation
Skeletal muscles and cardiac muscles are called striated muscles due to the presence of alternate dark and light bands. When stained, this arrangement is visible as light and dark bands under the microscope. Hence, striations appear on striped muscles. Therefore, option A is correct.
Cardiac muscle cells are ______________________.
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Uninucleate and voluntary
0%
Uninucleate and involuntary
0%
Multinucleate and voluntary
0%
Multinucleate and involuntary
Explanation
Cardiac muscle cells are found in the walls of the heart. They are uninucleate as each cell has a single nucleus. Also, these cells are not controlled by will and hence said to be involuntary.
So the correct answer is option B.
Striated muscles______________.
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Are spindle shaped
0%
Get tired and need rest
0%
Never get tired
0%
Are also called involuntary muscles
Explanation
Striated muscle gets tired after strenuous exercise because creatine phosphate stores are exhausted.
During the normal process, creatine phosphate is converted to creatine and phosphate is released to make one ATP from ADP.
But when creatine stores are exhausted after strenuous exercise, then glucose undergoes glycolysis to form pyruvic acid, which is then converted to lactic acid, which gives rise to ATP, and muscle need is fulfilled.
But eventually lactic acid builds up in muscle and pH drops and muscle gets fatigued.
Striated muscles are voluntary and cylindrical in shape.
Therefore, option B is correct.
Squamous epithelium is found in________________.
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0%
Lung alveoli
0%
Trachea
0%
Intestine
0%
Oviduct
Explanation
Squamous epithelial cells are thin, flat cells. Simple squamous epithelium is a single layer of squamous cells, which form a thin, delicate lining. Such lining is generally utilized where the transportation of substances takes place through selective permeability.
The trachea is a windpipe, which connects larynx and pharynx to the lungs. Trachea carries the wind to the lungs. So, the trachea need not be having the selectively permeable lining.
The intestine is the place where absorption of nutrients takes place. For this function, tall columnar cellular lining is utilized.
Oviduct carries out the function of pushing the fertilized ovum or zygote towards the uterus. For this purpose, the inner surface of the oviduct is lined by ciliated epithelium, which moves and pushes the zygote.
Lung alveoli perform the function of gaseous exchange. For this purpose, alveoli has a selectively permeable lining of simple squamous epithelial cells. So, the correct option is A.
Haversian canal occurs in_______________.
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Cartilage
0%
Bone
0%
Internal ear
0%
Liver
Explanation
Haversian canals can be defined as a series of tubes around narrow channels formed by lamellae. They are seen in compact bones and are absent in cartilage, internal ear and liver.
Hence the correct option is B.
Which of the following tissue belongs to the category of loose connective tissue?
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White fibrous tissue
0%
Areolar tissue
0%
Yellow fibrous tissue
0%
Cartilage tissue
Explanation
Cartilage has widely spaced cells interspersed in the matrix made of proteins and sugars. It covers the ends of bones at joints and provides for easy movement.
The main functions of white fibrous tissue involve supporting and protecting the surrounding structures.
Areolar connective tissue is a type of loose connective tissue, which is found in between the skin and the muscles, around blood vessels, nerves. It is also found in the bone marrow.
In this way, it fills the space inside the organ, supports the internal organ and also helps in tissue repair.
Yellow fibrous tissue enables organs and parts of organs to stretch (and contract). This is important when the function of the organ involves movement like expansion and contraction of membranes e.g. of lung tissue.
So, the correct answer is option B.
Which of the following helps in repair of tissue and fills up the space inside the organ?
Report Question
0%
Tendon
0%
Adipose tissue
0%
Areolar tissue
0%
Cartilage
Explanation
Areolar tissue is a connective tissue found in between skin and muscles, around blood vessels, nerves, and the bone marrow. It fills the space inside the organ, supports the internal organ, and helps in tissue repair.
Tendon is a tough fibrous connective tissue that connects muscle to bone.
Adipose tissue is fat-storing tissue that is present in between the skin and internal organs.
Cartilage has widely spaced cells and is interspersed in a matrix made of proteins and sugars. It covers the ends of bones at a joint.
So, the correct answer is option C.
Which tissue does lack blood supply and heals slowly?
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Nervous
0%
Muscle
0%
Cartilage
0%
Bone
Explanation
Nervous tissue is well supplied with blood vessels.
Muscle tissue has an abundant blood supply.
Bone cells are embedded in a hard matrix that is made up of salts of calcium and phosphate. Bone is supplied with blood vessels through the haversian canal.
Cartilage has widely spaced cells that are embedded in the matrix made of proteins and sugars. Cartilage has limited repair capabilities because chondrocytes are bound in lacunae and hence they cannot migrate to damaged areas. Therefore, cartilage damage is difficult to heal. Also, because hyaline cartilage does not have a blood supply, the deposition of the new matrix is slow.
Therefore, option C is correct.
Bone matrix is rich in______________.
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Fluoride and calcium
0%
Calcium and phosphorus
0%
Calcium and potassium
0%
Phosphorus and potassium
Explanation
Bone is not a uniformly solid material, but is mostly a matrix. The primary tissue of bone, is relatively hard and light-weighted.
Its matrix is mostly made up of a composite material incorporating the inorganic mineral calcium phosphate and organic collagen, an elastic protein, which improves fracture resistance.
Bone is formed by the hardening of this matrix around entrapped cells.
Hence the correct option is B.
Cartilage and bone are types of
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Muscular tissue
0%
Connective tissue
0%
Epithelial tissue
0%
All of the above
Explanation
Cartilage has widely spaced cells and interspersed in the matrix made of proteins and sugars. It covers the ends of bones at the joint.
Bone is made of cells that are embedded in a hard, rigid, compact matrix. It forms the framework of the body.
Connective tissue is composed of fibers, ground substance, and cells. Bone and cartilage are examples of connective tissue that provides mechanical support and framework to the body.
So, the correct option is C.
Which of the following muscles act involuntarily?
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Striated muscles
0%
Smooth muscles
0%
Cardiac muscles
0%
Both B and C
Explanation
The involuntary muscles perform the activity on its own. The movement of these muscles cannot be controlled willingly. T
he smooth muscles are present in the lining of the tubular organs of the digestive system. These muscles are involuntary and perform the function of peristalsis.
Cardiac muscle is the muscle found in the wall of the heart. It is an important type of muscular tissue which works automatically (involuntary) and thus, called as involuntary muscles.
Thus, the correct answer is option D.
A characteristic of skeletal muscle is_______________.
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0%
Rapid contraction
0%
Voluntary
0%
Fatigued after some time
0%
All of the above
Explanation
Skeletal muscle is a form of striated muscle tissue which is under the control of the somatic nervous system; that is to say, it is voluntarily controlled.
Striated muscle gets tired after strenuous exercise after creatine phosphate stores are exhausted. During normal process, creatine phosphate is converted to creatine and phosphate is released to make one ATP from ADP. But when creatine stores are exhausted after strenuous exercise, then glucose undergoes glycolysis to form pyruvic acid which is then converted to lactic acid which gives rise to ATP and muscle need is fulfilled. But eventually lactic acid builds up in muscle and pH drops and muscle get fatigue.
Therefore, option D is correct.
Haemoglobin is involved in _____________.
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0%
Transport of oxygen
0%
Transport of carbon dioxide
0%
Hormonal circulation
0%
Both A and B
Explanation
Haemoglobin is a conjugated protein molecule present in the red blood cell. It has a globin part and a heme part, containing iron. It carries oxygen from the lungs to body tissues and returns the carbon dioxide from tissues back to the lungs.
Hemoglobin transports oxygen by forming oxyhemoglobin complex and carbon dioxide by forming carbaminohemoglobin. It is not involved in the transport of hormones.
Hence, the correct option is D.
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