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Science Class 9

Class 9 : Notes | EduRev

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Short Answer Type Questions

Q.1. (a) Why is connective tissue called so?
(b) What is the function of the areolar connective tissue?

(c) Which substance is present in the adipocyte? How does it help?    [CBSE 2016,15]
Ans. (a) These tissues connect various body organs. They connect bones to each other, muscles to bones and bind tissues. They are therefore called connective tissues.
(b) Areolar connective tissue are loose and cellular connective tissue. They act as a supporting and packing tissue between organs lying in the body cavity. They also help in repairing of tissues.
(c) Adipocytes are filled with fat globules. They keep visceral organs in position forming shock-absorbing cushions around them. Storage of fat also act as an insulator.

Q.2. State the location of apical meristem.    [CBSE 2015]
Ans.
Apical meristem is present at the growing tips of stems and roots.

Q.3. Name the fluid matrix of a connective tissue.    [CBSE 2015]
Ans.
Plasma.

Q.4. What are the functions of phloem?    [CBSE 2015]
Ans. 
Phloem transports food from leaves to other parts of the plant.

Q.5. Name the dead element of phloem.    [CBSE 2015]
Ans. 
Phloem fibres.

Q.6. State the difference between the tissue of the outer layer of the branch of a tree and the outer layer of a young tree stem.    [CBSE 2015]
Ans.
The outer layer of a tree is made up of bark (dead cells) whereas outer layer of a young tree stem is made up of epidermis (living cells).

Q.7. (a) State any two differences between tendon and ligament.
(b) Give the function of adipose tissue.    [CBSE 2015, 2013]
Ans.
(a) Differences:

TendonLigament
(i) It is strong and non-flexible.(i) It is elastic and flexible.
(ii) It joins muscles to bones.(ii) It joins bones to bones.
(iii) It is formed of white fibrous connective tissue.(iii) It is fonned of yellow fibrous connective tissue.

(b) Adipose tissue stores fats and are found below the skin and between internal organs. It also acts as an insulator.

Lorsg Answer Type Questions

Q.1. Write difference between animal tissue and plant tissue.    [CBSE 2015]
Ans. 

Plant Tissues
Animal Tissues
(i) Tissue organisation is towards stationary or fixed habit of plants.
(i) Tissue organisation is towards active locomotion of animals.
(ii) In plants, dead supportive tissues are more abundant.
(ii) In animals, living tissues are more abundant.
(iii) Plants need less maintenance energy as they are capable of making their own food.
(iii) Animals need more maintenance energy as they have to move in search of food.
(iv) There is differentiation of merismatic and permanent tissues.
(iv) Such differentiation is absent in animal tissue.
(v) Organisation is simple in plant.
(v) Organisation is complex in animal tissues due to the development of specialised organs and organ systems.
(vi) Growth is limited to certain regions.
(vi) Growth is not limited to a region in animals.


Q.2. Based upon cell shape, cell wall and intercellular spaces, prepare a comparative study table between parenchyma, collenchyma and sclerenchyma. Which of these tissues is dead.    [CBSE 2011, 2014, 2015]
Ans. 

ParenchymaCollenchymaSclerenchyma
(i) Living cells and isodiametric in shape.Living cells, with thick corners.Dead cells, long and narrow with tapered ends.
(ii) Cell walls are thin and made up of cellulose.Cell walls are thickened at corners with extra deposition of cellulose and pectin.Cell walls are thick due to heavy deposition of lignin.
(iii) Cells have distinct nucleus and a large central vacuole.Cells have distinct nucleus and dense cytoplasm.Cells do not have a nucleus and cytoplasm.
(iv) It stores food, waste products and forms packing tissue.It gives mechanical support and flexibility.It gives rigidity and mechanical strength to the plant.
(v) It is present in all soft parts of plant; i.e. in stems, roots, leaves, flowers and fruits.It is present below the epidermis in stems and leaves.It is present in xylem and phloem, in shells of nuts, in hard seeds, pulp of pear, etc.

Sclerenchyma is a dead tissue.

Q.3. Answer the followings:
(a) Name the constituents of phloem tissues.
(b) Write the specific function of cardiac muscle.
(c) Name the tissue that:
(i) forms inner lining of our mouth.
(ii) forms soft parts of leaf, stem, root and fruit.
(d) Write two functions of adipose tissues.
Ans.
(a) Phloem consists of four elements —
Sieve tubes, companion cells, phloem parenchyma and phloem fibres.
(b) Cardiac muscles show rhythmic contraction and relaxation of the heart and thus help to pump and distribute blood to various parts of the body.
(c) (i) Squamous epithelium
(ii) Parenchyma
(d) (i) It protects delicate organs.
(ii) Storage of fats helps it to act as an insulator and as a shock absorber.

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