Class 9 Science Chapter 6 Question Answers - Tissues

Q1: Name the tissues responsible for the movement of the body.
Ans: Muscle tissue and nervous tissue.

Q2: What does a neuron look like?
Ans: A neuron is the unit cell of nervous tissue. It is a thread-like structure with a cell body and axon.
Ques 3: Name the types of simple tissues.
Ans: (a) Parenchyma
(b) Collenchyma
(c) Sclerenchyma

Q3: Name the types of complex tissues.
Ans: Xylem and phloem.

Q4: Where is apical meristem found?
Ans: It is present at the growing tips of stems and roots, and it increases their length.

Q5: Which tissue makes up the husk of coconut?
Ans: Sclerenchyma.

Q6: What are the constituents of phloem?
Ans: Phloem constitutes the sieve tubes, companion cell, phloem parenchyma, and phloem fibers.

Q7: Define aerenchyma.
Ans: When the cells have air-filled large cavities of parenchyma, it is called aerenchyma. Aerenchyma helps aquatic plants in floating.

Q8: What is the utility of tissues in multicellular organisms?
Ans: It helps in the growth, and organisation of different organs and performing functions.

Q9: Name the two types of tissues.
Ans: Plant tissues and animal tissues.

Q10: Name the two types of plant tissue.
Ans: Meristematic tissue and permanent tissue.

Q11: What is differentiation?
Ans: The process of taking up a permanent shape, size and function by cells is called differentiation.

Q12: Name the three types of meristematic tissues.
Ans: The three types are:
(a) Apical tissue—tips of root and shoot
(b) Lateral tissue—sides of the stem
(c) Intercalary tissue—at nodes

Q13: Where is apical tissue found?
Ans: Present at the tips of roots and stems.

Q14: Tissues present at the lateral surface of the stem are called apical tissues. Put (T) if true and put (F) if false.
Rewrite the answer if (F).
Answer: (F). Tissues present at the lateral surface of the stem are called lateral tissue.

Q15: Which tissues are present at the nodes of the plants?
Ans: Intercalary tissue.

Q16: What are the various types of blood cells?
Ans: There are three types:
(a) RBC’s
(b) WBC’s and
(c) Platelets.

Q17: What are tracheids?
Ans: They are elongated cells with tapering ends.

Q18: What are guard cells?
Ans: Each stoma is bounded by a pair of specialized kidney-shaped epidermal cells called guard cells.

Q19: Epithelial tissue is the simplest tissue. Write (F) for false or (T) for true.
Ans: (T).

Q20: What are the functions of cuboidal epithelium?
Ans: It helps in absorption, excretion, and secretion, it also provides mechanical support.

Q1: Give four differences between bone and cartilage.

Ans:

Q2: Give the functions of bone.
Ans: The functions of bone are:
(i) It provides shape to the body.
(ii) It provides skeletal support to the body.
(iii) It anchors the muscles.
(iv) It protects the vital body organs like the brain, lungs, etc.

Q3: Give the functions of cartilage.
Ans: (i) It provides support and flexibility to the body parts.
(ii) It smoothens the surface at joints.

Q4: Fill in the blanks:
(i) Water and minerals are conducted by ………………….
(ii) In higher plants food is conducted by ……………………..
(iii) Blood is a ……………. tissue.
(iv) Bone consists of………….cells.
(v) Cartilage consists of………………..cells.
(vi) Fibres are absent in………….type of connective tissue.
Ans: (i) Xylem
(ii) Phloem
(iii) Connective
(iv) Osteocyte
(v) Chondrocyte
(vi) Blood

Q5: What are the functions of areolar tissue?
Ans: Functions are:
(i) It helps in the repair of tissues after an injury.
(ii) It also helps in combating foreign toxins.
(iii) It fixes skin to underlying muscles.

Q6: Give the difference between xylem and phloem.
Ans:

Q7: What are fibers?
Ans: Fibres consist of very long, narrow, and thick cells. For example, jute fiber.

Q8: Name the tissues for the following:
(a) Stores fat in an animal body.
(b) Divides and re-divides to grow in plants.
(c) Tissue that joins hone to hone.
(d) Covers the external surface of an animal body.
Ans: (a) Adipose tissue
(b) Meristematic tissue.
(c) Ligament
(d) Epithelial tissue.

Q9: What is stomata?
Ans: Stomata are small pores present on the surface of a leaf that helps in the exchange of gases and in transpiration.

Q10: Why does epidermal tissue have no intercellular space?
Ans: The epidermal (layer) tissue forms a protective outer covering for the plants and it protects the internal parts of the plant. It aid in the protection against loss of water, mechanical injury and invasion by parasitic fungi.
For this protective role to play the continuation of cells is necessary, hence it does not have intercellular space.

Q11: Name and give the function of each cell of the xylem.
Ans: Xylem consists of tracheids, vessels, xylem parenchyma, and xylem fibers.
Tracheids and vessels—Allows the transport of water and minerals.
Xylem parenchyma—Stores food and helps in the sideways conduction of water.
Xylem fibers—Are supportive in function.

Q12: What is the function and location of stratified squamous epithelium?
Ans: Stratified squamous epithelium is present in the skin. The layers of cells are arranged to prevent wear and tear.

Q13: Give the difference between ligament and tendon.
Ans:

Q14: Give the difference between striated muscles and unstriated muscles.
Ans:

Q15: State the difference between bone and blood.
Ans:

Q16: Name all different types of tissues present in animals.
Ans: There are four main types of tissues present in animals. 
(a) Epithelial tissue present on the outer and inner lining of the body.
(b) Muscular tissue is made up of muscles, that help in movement.
(c) Connective tissue connects the different organs in the body.
(d) Nervous tissue consists of nerve cells and is present in the nervous system.

Q17: Why is blood called connective tissue?
Ans: The blood is composed of cells and plasma. Plasma is a fluid and cells like red blood cells, white blood cells, and platelets are present in it. All these cells are connected due to plasma. It also transports food, and water to different parts of the body and connects them.

Q18: Name three types of muscle tissues and give the function of each.
Ans: Three types of muscle tissues are:
(a) Striated muscle (b) Smooth muscle (c) Cardiac muscle
(a) Striated muscle: These muscles show alternate light and dark bands or striations. They are involuntary and present in skeletal tissues, help in the movement of the body and bones.
(b) Smooth muscle: These are involuntary muscles, control the movement of food in the alimentary canal, contraction and relaxation of blood vessels. Present in iris, uterus etc.
(c) Cardiac muscle: These muscles are present in heart, help in rhythmic contraction and relaxation throughout the life.

Q19: State the difference between simple tissues of plants.
Ans: The simple tissues of plants are:
(i) Parenchyma (v) Collenchyma (iii) Sclerenchyma

Q20: With the help of a diagram show the difference between striated muscle fiber, smooth muscle fiber and cardiac muscle fiber.
Ans:

Q21: Name different types of meristematic tissue and draw a diagram to show their location.
Ans: The 3 different types of meristematic tissue are:
(a) Apical meristem—Function: growth in length.
(b) Lateral meristem—Function: growth in thickness.
(c) Intercalary meristem—Function: growth in internodes.Meristematic Tissue

Q22: Explain the structure, function and location of nervous tissue.
Ans: Structure: Nervous tissue consists of cells called nerve cells joined end to end (neurons). A neuron (nerve cell) consists of a cell body with a nucleus and cytoplasm. From these cell bodies a long thin hair-like parts arise called axon and many short branched parts called dendrites.
Location: Nervous tissue are present in brain, spinal cord and nerves. Function: Nervous tissue receives the stimuli and transmits the stimulus rapidly from one place to another within the body. The nerve impulse allows us to move our muscles and respond to any stimuli.

Long Answer Type Questions

Q1: Show the types of animal tissues using flow chart.
Ans:Q2: What is connective tissue? Explain its types.
Ans: The connective tissue consists of different types of cells, all of them perform the same function.
Areolar connective tissue: It is found between the skin and muscles, around blood vessels and nerves and in the bone marrow.Areolar tissue fills the space inside the organs. It supports internal organs and helps in repair of tissues.
Adipose tissue: Adipose tissue stores fat, found below the skin and between internal organs. The cells of this tissue are filled with fat globules. It acts as an insulator due to fat storage.
Blood: It has a fluid called plasma, in plasma are present red blood cells, white blood cells and platelets. Blood flows all over the body and helps in the transport of gases, digested food, hormones and waste material to different parts of the body.
Lymph: Lymph carries digested fat and lot of white blood cells in the plasma. Bone: It forms the framework that supports the body. It supports the different parts of our body. It is strong and non-flexible tissue.
Cartilage: It is present in nose, ear, trachea and larynx. It smoothens bone surfaces at joints.
Tendon: It connects bone and muscles. These tissues are fibrous, flexible and with lot of strength.
Ligament: It connects bone to ‘bone. It is elastic, has lot of strength.

Q3: Describe the ‘epidermis’ in plants.
Ans: Epidermis forms the entire outermost layer of the plant. It is made up of single cell layer. It protects all the internal parts of the plant.
On aerial parts, epidermis secretes waxy, water-resistant layer on their outer surface. This helps in protection against loss of water, mechanical injury and invasion of parasitic fungi.
In leaves, epidermis consists of small pores called stomata. These pores helps in the transpiration and exchange of gases, like oxygen and carbon dioxide for plants.
In roots, epidermis have long hair-like parts that provide greater surface for water absorption.
In desert plants, epidermis has a thick waxy coating of cutin which acts as a water proofing agent.

Q4: Explain the “complex tissue” of plants.
Ans: Complex tissues are made up of more than one type of cells. All these cells co-ordinate to perform common function. These are—xylem and phloem. Both are conducting tissues and form a vascular bundle.
Xylem consists of—tracheids, vessels, xylem parenchyma and xylem fibres. Most of these cells are dead. Tracheids and vessels helps in water transportation, parenchyma stores food and helps in the sideways conduction of water and fibres are mainly supportive in function.
Phloem is made up of four types of elements—sieve tubes, companion cells, phloem fibres and phloem parenchyma. It helps in the transportation of food in both the directions, i.e. from leaves to roots and to other parts of the plant.

Q1: Take two glass jars and fill them with water.

Now, take two onion bulbs and place one on each jar, as shown in the figure given below.

• Observe the growth of roots in both the bulbs for a few days.
• Measure the length of roots on day 1, 2 and 3.
• On day 4, cut the root tips of the onion bulb in jar 2 by about 1cm. After this, observe the growth of roots in both the jars and measure their lengths each day for five more days and record the observations in tables, like the table
From the above observations, answer the following questions:
(a) Which of the two onions has longer roots? Why?
(b) Do the roots continue growing even after we have removed their tips?
(c) Why would tips stop growing in jar 2 after we cut them?
Answer: (a) The onion in jar 1 has longer roots, as the growth of roots continues in it due to intact root tips.
(b) The roots did not continue to grow in jar 2 after cutting down their tips.(c) The tips of root stopped growing in jar 2 because the tips of these roots were cut down and the tissues which helps in the growth of roots i.e., meristematic tissues are removed from it.

Q2: Take a plant stem and with the help of your teacher cut into very thin slices or sections.
Now, stain the slices with safranin. Place one neatly cut section on a slide, and put a drop of glycerine.
Cover with a cover-slip and observe under a microscope. Observe the various types of cells and their arrangement.
Answer the following on the basis of your observations:
(a) Are all cells similar in structure?
(b) How many types of cells can be seen?
(c) Can we think of reasons why there would be so many types of cells?
Transverse section and Longitudinal section of stem
Answer:
(a) No, all cells are not similar in structure, we see variety of cells with different shape and size.
(b) We can see at least ten different types of cells in the slide.
(c) Yes, there are variety of cells so that each group of cell does a specific role in the overall growth of plant.

Q3: Take a freshly plucked leaf of Rheo.
Stretch and break it by applying pressure.
While breaking it, keep it stretched gently so that some peel or skin projects out from the cut.
Remove this peel and put it in a petridish filled with water.
Add a few drops of safranin.
Wait for a couple of minutes and then transfer it onto a slide. Gently place a cover slip over it.
Ans: (a) The slide shows epidermal cells with stomatal pores as shown in Fig. (a).
(b) On focusing stomata pores under microscope. We can see guard cells and stomata pore as shown in Fig. (b).

Q1: A group of students completed the project of finding the botanical names of all the trees present in the school campus. They prepared metal plates with names carved on it, to fix it on the plant trunks. Shreya was concerned that if the metal plate is fixed into tree many cells of the tree may get damaged. But the group members explained her that the outer layer of trunk does not have living cells and there won’t be any damage to the tree.
(a) What type of cells are present on the outer layer of the bark/tree trunk?
(b) How does the cprk act as a protective tissue?
(c) What value of the group is seen in the above cast?
Ans: (a) On the outer layer of the tree trunk/bark all thick layer of dead cells is present which acts as protective tissue.
(b) In cork, all cells are dead without intercellular spaces, the walls of the cells have deposition of suberin.
(c) The students in a group show team effort, peer learning and co-operatiye.

Q2: A paralytic patient was unable to walk. ‘The family member of the atient took the outmost care of the patient.
(a) Name two tissues responsible for the movement of a body.
(b) Name the tissues present in brain and spine.
(c) What value of the family members is seen in the above case?
Ans: (a) The two tissues responsible for movement of the body are muscular tissue and nervous tissue.
(b) The tissues present in brain and spine are nervous tissues.
(c) The family members showed the value of being caring, responsible, dutiful and kind.