CBSE Class 9 Biology Tissues Worksheet Set D

1 Mark Questions

Question. Why is sometimes squamous epithelium called stratified squamous epithelium?
Answer. The squamous epithelium when gets arranged in form of layers then it is known as stratified squamous epithelium.

Question. What type of function is performed by a single cell of amoeba?
Answer. Amoeba being a unicellular organism performs all the vital functions like respiration, metabolism, and other functions like ingestion of food, excretion.

Question. What is the function of guard cell in the stomata?
Answer. The guard cell controls the opening and closing of the stomata which helps in exchange of gases and water vapour in the atmosphere.

Question. What is the function of root hairs?
Answer. The hair like projections present on the roots helps in the increased absorption of water through soil by increasing the surface area for absorption.

Question. Name the branch of biology which deals with the study of tissues.
Answer. Histology

Question. Tissue which forms lining of the mouth is?)
Answer. Squamous epithelium is a simple flat cells forming lining of the mouth.

Question. Name the outermost layer of cells in old plants.
Answer. Cork

Question. Water hyacinth floats on the water by maintaining buoyancy in water. What part of plant body is responsible for this?
Answer. In aquatic plants, there are large cavities present in parenchyma which help these plants to float above the water by maintaining its buoyancy.

Question. A chemical responsible for the stiffness of husk of the coconut. Also name the plant tissue found in the husk.
Answer. Lignin, a chemical substances which gets deposited on the wall of the cell making it stiff. The plant tissue of which husk is made is known as Sclerenchyma tissue.

Question. What is tissue?
Answer. A group of cell performing similar function combines to form a tissue. On a broad basis tissues are divided into two: Animal Tissue and Plant tissue.

Question. Which tissue is commonly known as packing tissue in animals?
Answer. Areolar tissue

2 Mark Questions

Question. A person got wounded, his blood is flowing continuously out of the wound, and blood clot is not formed. Which component of the blood is missing in the blood of the person?
Answer. Blood platelets which are essential for clotting of blood at the site of injury is absent or less in no. In the person’s blood which can cause serious loss of blood from the body and ultimately death.

Question. State the function of
Answer. (a) Aerenchyma
(b) Chlorenchyma
(a) Aerenchyma- Provides buoyancy to aquatic plants as contains large air cavities.
(b) Chlorenchyma – Does Photosynthesis as contains chloroplasts.

Question. How is involuntary action different from voluntary action? Quote an example.
Answer. Voluntary action: the action which is under our will. It is attained with the help of skeletal muscles. Example: movement of the limbs Involuntary action: the action which is not under our will. It is attained with the help of smooth and cardiac muscles. Example: movement in alimentary canal

Question. Why heart is not made of smooth muscles.
Answer. Since heart pump need to regularly pump blood all over the body it needs to work fast. This is not achieved by smooth muscle and so cardiac muscle makes heart to contract and relax.

Question. A Gardner was cutting the the excess plants growing in the garden by mistake he cuts the apical meristem of a plant. What will happen? Will there be any change in the growth of the plant?
Answer. Apical meristem is a type of meristematic tissue found on the tips of roots , shoots, leaves, etc. There basic function is to provide growth to the plant by growing roots and shoots from the tips. There by there would be no or less growth shown by the plant.

Question. Epidermis of plants living in arid regions is thicker than in the usual ones. give reason.
Answer. In hot and dry regions the chances of drying of plant is more as more water is lost through transpiration. to prevent this loss the outer covering of the plants i.e. epidermis is thicker than plants in other region.

Question. Write a short note on the functions of lymph.
Answer. It helps in transportation of nutrients like oxygen, glucose which could be filtered through blood capillaries. It also protects the body against infections.

Question. What are the functions of blood?
Answer. Blood carries oxygen and food to all the body cells and in return takes up the waste matter produced by the cell and carries it to liver and kidney. It carries nutrients, hormones and vitamins to the cells.

Question. Write ‘I’ for involuntary action and ‘v’ for voluntary actions for the following activities:
(a) Pumping of heart
(b) Movement of head
(c) Peristaltic movement
Answer. (a) I
(b) V
(c) I

Question. What are simple permanent tissues? Name its type.
Answer. These are the tissues formed from a single type of cells structurally and performing similar functions.
Types of simple permanent tissues are:
(a) Parenchyma
(b) Collenchyma
(c) Sclerenchyma

3 Mark Questions

Question. Quote the various functions of meristematic tissue?
Answer. – Acts as a parent tissue: Leads to development of other tissue from itself.
-Forms new cells: Sustain growth by forming news cells for the pre – existing ones.
-Continuous production of plant parts: Plant parts like leaves, branches stem, roots, fruits, etc are continuly formed.
– Easy healing of injured parts: Provides healing of injury by forming new cells.

Question. Write a short note on functions of collenchymas tissue.
Answer. Functions:
– Provides mechanical support to plants.
– Provides tensile strength to the plant provided with flexibility to bend its parts easily without breaking.
– Is the chief mechanical tissue for young plants Sclerenchyma

Question. Write some features of cork and where they have application.
Answer. Features:
– Dead cells with no intercellular spaces.
– Contains a chemical substance , suberin which restricts the penetration of gases and water through it.
– Protects plants from injuries, water loss and germs.
Applications
– Commercially used for making products like bottle stoppers, shuttle cork.

Question. Answer in one word.
1. Pigment which is helpful in performing photosynthesis.
2. Packing tissue of plant
3. Process of specialization of meristemetic tissue to a permanent shape, size and function.
4. Meristem present at growing tips of roots
5. Dead element in phloem
Answer. 1. Chlorophyll
2. Parenchyma
3. Differentiation
4. Apical meristem
5. Phloem fibre or bast fibre

Question. What is role of tissues present in multi-cellular organisms?
Answer. The formation of tissues is important in multi-cellular organisms as :
(a) Grouping of cells and performing a single function by the group shows division of labour.
(b) Tissues combine to form organ, organ to organ system and organ systems to organisms.
(c) Due to improved organisation and higher efficacy organisms have high survival rate.

Question. Write the characteristics of Meristematic tissues.
Answer. – Cells are spherical, oval , polygonal or rectangular in shape with thin cellulose cell walls.
– Intercellular spaces absent
– Dense cytoplasm
– Prominent nucleus
– Vacuoles absent

Question. Show the experiment used to study of the stem.
Answer. Procedure:
– Cut the stem into thin slices.
-Stain them with safranin
-Take thin nicely cut slice on the slide
Put a drop of glycerine on the slice and gently cover it with a cover slip. Observe the slice into microscope

Question. What are the types of tissues found in animals?
Answer. On the basis of functions the animal tissues are divided into the following:
– Muscular tissue
– Nervous tissue
– Connective tissue
– Epithelial tissue
– Muscular tissue

Question. What is the basic functions performed by epithelium tissue?
Answer. – protects the underlying organs from injuries, chemical effect and drying up.
– helps in absorption of water and nutrients.
– helps in elimination of waste products
– keeps different organs separate
– some have secretary functions, substances like saliva, mucus ,etc are secreted by some cells.

Question. ‘I can walk, eat or dance according to my will but cannot control functioning of heart and blinking of eyes. ‘ Comment.
Answer. The above actions are performed by muscles of one or other type. Actions can be divided into two Voluntary and involuntary actions which are performed by skeletal or striated muscles and smooth or involuntary muscles.
The actions like walking,eating,dancing which are under control of our will are voluntary actions whereas actions like contraction and relaxatiom of heart and blinking of eyes is not in ones own hand so is an involuntary action.

Question. Raj and Ajay were playing football with their friends, raj suddenly got injured. Ajay with other friends took him to hospital where doctor told them that raj got sprain in leg and should rest for some days. They took him home and regularly visited him to enquire about his situation.
Answer the following questions:
(a) What is sprain?
(b) Is this a serious issue?
(c) What values are shown by raj’s friends?
Answer. (a) At the time of sprain, the ligament , a type of connective tissue gets stressed out.
(b) No, this not a serious issue as with resting the stress of the ligament could be reduced in few days.
(c) Raj’s friends love raj and are very helpful in nature.

5 Mark Questions

Question. State the functions of the following.
Answer. (a) Epidermis
(b) Cork
(a) Epidermis provides protection to all body parts of plant as there structure does not have any intercellular spaces in between the cells. In dry places, epidermis forms a thick covering on the plant to protect the plant from drying due to transpiration. It also protects the plant towards mechanical injury and invasion from foreign organisms.
(b) Cork forms the bark of the tree and is protective in function like epidermis. The walls of cork cells are thickened by a chemical known as suberin. This chemical makes the cells impermeable to water and gases which prevents desiccation, infection and mechanical injury to plant.

Question. state the structure of the following:
(a) Vessels
(b) Tracheids
(c) Sieve tubes
Answer. (a) Vessels:
– Dead cells
Lignified cell walls
Pipe like structure with upper and lower portions absent in the tubes
(b) tracheids:
– Dead cells
long elongated cells with tapering ends
-non-lignified areas present known as pits through which water flows.
(c) Sieve tubes:
– cells are elongated with thin cell walls
– nucleus and other organelles absent
– cytoplasm is continuous due to presence of pores

Question. Show with a help of an experiment show apical meristem causes growth in length of plant.
Answer. Procedure:
1. Take two onions in jar filled with water such that the onions are slightly dipped in water.
2. After five days observe the growth of the roots.
3. Cut the tips of roots of onion placed in jar 2.
4. After few days observe the growth of roots in both the jars.
Observation:
1. Jar 1 shows root elongation
2. Jar 2 do not show further growth in the roots
Inference:
Since the tips of roots in jar 2 were cut therefore no growth was shown. Therefore the tissues present at the tips i.e. apical meristem is responsible for growth of the plant.

Question. A short note on Types of epidermis.
A) Aerial epidermis
B) Root epidermis
Answer. (A) Aerial epidermis is the epidermis making an outer covering of the aerial parts of plant. Epidermis sometimes secrete waxy substance called cutin which makes a water proof layer around the plant.
Function: Helps in preventing plants from desiccation and foreign invasion. Stomata are present on epidermal cells for exchange of gases with atmosphere and loss of water in atmosphere. In desert plants, the epidermis and cutin is thick preventing greater water loss from the plant surface.
(B) Root epidermis the epidermis present on the surface of root making its outer covering.
Function: This also helps in absorption of water. This epidermis has some hairy projection which increases water absorption by increasing the surface area for absorption.