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CNMS ICSE - 7 Std
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Answers to textbook exercises

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Chapter: 01. Tissues

⁠

Check Point 1

In unicellular organisms, all life activities are carried out within a single cell.
Answer: True
In an organ system, many organ work together to perform one major life function.
Answer: organs
Tissues is a group of structurally similar cells.
Answer: Tissue
Heart and blood vessels form the circular system.
Answer: circulatory
⁠

Check Point 2

The tissue that brings about increase in the height of the plant
Answer: Apical meristem
The tissue formed of elongated parenchymatous cells
Answer: Collenchyma
The only living cells in the xylem tissue
Answer: Xylem parenchyma
Tissue in which sieve tubes are found
Answer: Phloem
⁠

Check Point 3

There are no intercellular spaces in epithelial tissue.
Answer: True
Connective tissues are protective in function.
Answer: False (Connective tissues are binding, supporting, and packing tissues)
Adipose tissues store fats in the adipose cells.
Answer: True
The ligaments connect two bones at the joints.
Answer: True
Bones are elastic tissues.
Answer: False (Bones are hard, strong, and nonelastic tissues)
⁠

Test Yourself

A. Multiple Choice Questions

In multicellular organisms, cells are associated to form (a) Organelle (b) Tissues © Organ (d) Organism
Answer: (b) Tissues
The nucleus is absent in (a) Parenchyma cells (b) Red blood cells © Squamous epithelial cells (d) Neurons
Answer: (b) Red blood cells
Meristematic tissues have cells that (a) divide continuously (b) do not divide © are highly specialised (d) have thick lignified cell wall
Answer: (a) divide continuously
Vascular bundles of plants are formed of (a) Xylem tissue alone (b) Xylem and phloem tissues © Xylem, phloem and cambium (d) Sclerenchyma and collenchyma
Answer: (b) Xylem and phloem tissues
Blood is a (a) Connective tissue (b) Epithelial tissue © Supportive tissue (d) Conducting tissue
Answer: (a) Connective tissue
The body organisation in Euglena is (a) Cellular level (b) Tissue level © Organ level (d) Molecular level
Answer: (a) Cellular level
⁠

B. Assertion-Reason Type Questions

Assertion [A]: Vascular tissue in plants is a kind of simple tissue. ​Reason [R]: Vascular tissue transports water, minerals and food to different parts of plant.
Answer: (d) Assertion [A] is false but Reason [R] is true.
Assertion [A]: Ground tissue in plants is protective in function. ​Reason [R]: Ground tissue is formed of cells with thick cell wall.
Answer: (b) Both Assertion [A] and Reason [R] are false.
Assertion [A]: Nervous tissue is formed of nerve cells, called neurons. ​Reason [R]: Nervous tissue conducts message from one part of the body to brain or spinal cord and back to the body organs.
Answer: (a) Both Assertion [A] and Reason [R] are true.
⁠

C. Fill in the blanks with suitable words.

Each level of organisation is ______ than the lower one.
Answer: more complex
Energy transfer takes place in an ecosystem through ______.
Answer: food chain
______ tissue forms covering of body.
Answer: Epithelial
Cork cells are ______ and are found in ______ dicot stems.
Answer: dead, old and woody
Xylem and phloem form ______ tissue in plants.
Answer: conducting (or vascular / complex permanent)
Axons of several neurons are bundled together to form ______.
Answer: a nerve
⁠

D. State whether these statements are true or false. If false, rewrite the correct form of statements.

Permanent tissue is formed of meristematic cells.
Answer: True
Body of Amoeba is formed of a single cell.
Answer: True
Cardiac muscles are voluntary muscles.
Answer: False. Correct Form: Cardiac muscles are involuntary muscles.
Sclerenchyma cells form ground tissue in plants.
Answer: False. Correct Form: Parenchyma cells form ground tissue in plants.
Skin is connected with the body surface by adipose tissue.
Answer: False. Correct Form: Skin is connected with the underlying tissues by areolar tissue.
Lymph helps us fight against infection.
Answer: True
Phloem is formed of long, tubular cells that transport water.
Answer: False. Correct Form: Phloem is formed of long, tubular cells that transport food. (Or: Xylem is formed of long, tubular cells that transport water.)
⁠

E. Give one word for the following.

Group of different tissues that collectively carry out a specific function
Answer: Organ
Fluid part of blood
Answer: Plasma
A waterproof layer that protects leaves
Answer: Cuticle
Thread-like branches arising from the cyton of nerve cells
Answer: Dendrons (or Dendrites)
The system in which living and nonliving environments interact
Answer: Ecosystem
The living cells of xylem tissue
Answer: Xylem parenchyma
⁠

F. Name the type of tissue that

Transports food from leaves to different parts of plant
Answer: Phloem
Is formed of actively dividing cells and helps in plant growth
Answer: Meristematic tissue
Is formed of dead, fibre-like cells as bundle-sheath in stem and leaves
Answer: Sclerenchyma
Supports human body
Answer: Skeletal tissue (Bone and Cartilage)
Binds different tissues and organs
Answer: Connective tissue (specifically Areolar/Connecting tissue)
Forms the wall of heart
Answer: Cardiac muscular tissue
⁠

G. Give one main function of each of the following:

Epidermis
Answer: It covers and protects the underlying plant tissues from mechanical injury and entry of germs. In leaves, it secretes a waxy cuticle to prevent excessive water loss.
Sclerenchyma
Answer: It provides mechanical strength, rigidity, and structural support to the plant body.
Xylem vessels
Answer: They act as long pipes to transport water and dissolved minerals upwards from the roots to the leaves.
Adipose tissue
Answer: It stores fat in the form of oil globules, which acts as a food reserve, provides insulation against cold, and serves as a shock-absorbing cushion.
Cardiac muscles
Answer: They contract and relax rhythmically and continuously without fatigue to pump blood to all parts of the body.
RBCs
Answer: They transport and supply oxygen from the lungs to each and every cell of the body.
⁠

H. Identify the tissue that forms following structures.

Epidermis of leaf
Answer: Simple permanent protective tissue (Epidermis)
Vascular bundles
Answer: Complex permanent conducting tissues (Xylem and Phloem)
Stores fat
Answer: Adipose tissue
Bone
Answer: Skeletal connective tissue
Ligament
Answer: Fibrous connective tissue (Yellow elastic fibrous tissue)
Brain
Answer: Nervous tissue
Heart
Answer: Cardiac muscular tissue
⁠

I. Encircle the odd one out and give reasons for your choice.

Cartilage, lymph, blood, plasma
Answer: Cartilage. Reason: Cartilage is a solid skeletal connective tissue, whereas lymph, blood, and plasma are fluid connective tissues or parts of fluid tissues.
Parenchyma, epidermis, collenchyma, sclerenchyma
Answer: Epidermis. Reason: Epidermis is a protective plant tissue, whereas parenchyma, collenchyma, and sclerenchyma are supporting plant tissues.
Cyton, dendrite, nerve fibre, axon
Answer: Nerve fibre. Reason: Cyton, dendrite, and axon are the primary structural parts of a single neuron, whereas a nerve fibre is a bundle of axons.
Blood, matrix, plasma, platelets
Answer: Matrix. Reason: Matrix is the general non-cellular ground substance of connective tissues, whereas blood, plasma, and platelets are the components of fluid connective tissue.
Cork, cork cambium, xylem, phloem
Answer: Cork (or Cork cambium). Reason: If Cork is chosen, it is a dead, protective tissue, while the other three are actively involved in growth, division, or conduction. If Cork cambium is chosen, it is a meristematic tissue, whereas cork, xylem, and phloem are permanent tissues.
⁠

J. Differentiate between the following.

Collenchyma and sclerenchyma
Answer: | Feature | Collenchyma | Sclerenchyma | | :— | :— | :— | | Cell Status | Formed of living cells | Formed of dead, fiber-like cells | | Cell Wall | Irregularly thickened at the corners | Uniformly thickened with lignin | | Intercellular Spaces | Very little or absent | Completely absent | | Function | Provides flexibility and mechanical support | Provides mechanical strength and rigidity |
Cuboidal and squamous epithelium
Answer: | Feature | Cuboidal Epithelium | Squamous Epithelium | | :— | :— | :— | | Cell Shape | Cube-like cells | Flattened, scale-like cells | | Nucleus | Centrally placed and spherical | Centrally placed and flattened | | Function | Secretion, absorption, and gamete formation | Protection of underlying tissues |
Ligament and tendon
Answer: | Feature | Ligament | Tendon | | :— | :— | :— | | Elasticity | Strong but highly elastic | Strong and nonelastic (inelastic) | | Tissue Type | Yellow elastic fibrous tissue | White nonelastic fibrous tissue | | Connection | Connects bone to bone at joints | Connects skeletal muscle to bone |
Connective and muscular tissue
Answer: | Feature | Connective Tissue | Muscular Tissue | | :— | :— | :— | | Structure | Cells are loosely packed and suspended in a matrix | Made up of long, fibrous, contractile muscle fibers | | Primary Function | Binds, supports, protects, and packs organs together | Responsible for movement of body parts and locomotion |
Meristematic and permanent tissues
Answer: | Feature | Meristematic Tissues | Permanent Tissues | | :— | :— | :— | | Cell State | Young, active, and undifferentiated | Mature and differentiated | | Division Power | Cells keep on dividing continuously | Cells lose the power of division | | Cell Wall | Thin cell wall | Relatively thick cell wall | | Vacuole | Vacuoles are absent or very small | Cells contain a large central vacuole |
⁠

K. Match the columns.

Questions:
Cork
Sponges
Myofibrils
Root tip
Tissues
Blood cell formation
Matches:
Answer:
1. Cork — © Protective tissue
2. Sponges — (d) Cellular level
3. Myofibrils — (f) Contractility
4. Root tip — (e) Apical meristem
5. Tissues — (a) Division of labour
6. Blood cell formation — (b) Bone marrow
⁠

L. Answer these questions.

Name different levels of organisation below organism level.
Answer: The levels of organisation below the organism level in increasing order of complexity are:
Cellular level
Tissue level
Organ level
Organ-system level
What do you mean by organ system level of organisation? List the organs of excretory system.
Answer:
Organ system level of organisation: This level of organisation is formed when many different organs work together in a coordinated manner to perform one major life function (e.g., mouth, stomach, and intestines working together to form the digestive system).
Organs of the excretory system: The primary organs of the excretory system (specifically the urinary system) are the Kidneys, Ureters, Urinary bladder, and Urethra. (Other accessory organs involved in general excretion include the skin, lungs, and liver).
Which tissue is responsible for increase in the height of a plant? Where is it located in the plant body?
Answer: The apical meristem (meristematic tissue) is responsible for the increase in the height of a plant. It is located at the growing points of the plant, such as the tips of roots, shoots, and branches.
Name different types of epithelial tissues and give functions of each of them.
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