Tissues Extra Questions and Answers Science Chapter 6
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- MCQS
1) ______________ tissues are made up of dead plant cells.
(a) Parenchyma
(b) Sclerenchyma
(c) Collenchyma
(d) xylem
2) Example of involuntarily muscles include
(a) Smooth muscles and Cardiac muscles
(b) Smooth muscles and Striated muscles
(c) Striated muscles and Cardiac muscles
(d) Striated muscles and skeletal muscles
3) Adipose tissue stores_______________ in the cells.
(a) Glucose
(b) Fats
(c) Proteins
(d) All the above.
4) ___________ repair of tissue and fills up intercellular space inside the organs.
(a) Areolar tissue
(b) Epithelial tissue
(c) Adipose tissue
(d) Muscular tissue
(5) The tissue which conducts water in plant cells is:
(a) Parenchyma
(b) Xylem
(c) Phloem
(d) Collenchyma
(6) The tissue which is responsible for conducting food in plant cells is:
(a) Parenchyma
(b) Xylem
(c) Phloem
(d) Collenchyma
(7) Flexibility in plants is due to
(a) Collenchyma
(b) Sclerenchyma
(c) Aerenchyma
(d) Chlorenchyma
(8) Cork cells are made impermeable to water and gases due to
(a) cellulose
(b) hemicellulose
(c) suberin
(d) starch
(9) ___________ is present in growing tips of stems and roots which increases the length of the plant.
(a) Intercalary meristem
(b) apical meristem
(c) lateral meristem
(d) None of the above.
(10) Which is not Examples of connective tissue?
(a) Blood
(b) Bones
(c) Ligaments
(d) Cardiac cells
(11) When observed Under the microscope, ____________muscles show alternate light and dark bands when stained.
(a) Smooth muscle cells
(b) Straited muscle cells
(c) Cardiac muscle cells
(d) Involuntary muscle cells
(12) The blood plasma contains all except
(a) Proteins
(b) Salts
(c) Hormones
(d Lipids
(13) The brain, spinal cord and nerves are all composed of __________tissue.
(a) Connective tissue
(b) Nervous tissue
(c) Muscle tissue
(d) Epithelial tissue
In case you are missed :- Previous Chapter Extra Questions
Q.14) Which tissue forms skin, the lining of the mouth, the lining of blood vessels, lung alveoli etc.?
(a) Connective tissue
(b) Nervous tissue
(c) Muscle tissue
(d) Epithelial tissue
- ANSWER IN SHORT (1 MARKS)
Q.1) Give the characteristics of meristematic tissues?
Ans. The meristematic tissue cells are actively growing plant cells. meristematic tissue cells have dense cytoplasm, thin cell walls and a noticeable nucleus. Meristematic tissue cells do not lack vacuoles.
Q.2) What is the structure and function of epidermal root cells?
Ans. Epidermal root cells have long thin hair like projections which increase the absorptive surface area whose major function is absorption of water.
Q.3) What is a nerve impulse?
Ans. Nerve impulse is an electric signal which passes through the nerve fibers.
The nerve impulse allows muscular contraction and gives response to stimuli.
Q.4) What are guard cells?
Ans. These are kidney shaped cells which cover or surround the stomata. They help in opening and closing of the stomata
Q.5) What are tendons?
Ans. Tendons are the connective tissue responsible for connecting bones to another type of connective tissue. Tendons are not quite flexible, are of fibrous nature and have strength.
Q.6) Give the morphological features of skeletal muscle cells?
Ans. The skeletal muscle tissue cells are long, cylindrical, unbranched and Multinucleate. On staining they also show presence of alternate dark and light bands.
- ANSWER IN SHORT (2 MARKS)
Q.1) What is stomata? State its function.
Ans. Stomata are the small opening present on the leaf epidermis surface. The stomata are surrounded the guard cells which help in exchanges of gases. An important process which involves stomata is transpiration. It is the process of loss of water vapor through stomata.
Q.2) State the three forms of meristem? Give the functions of each.
Ans. The three types of meristematic tissue are
- Apical meristem
- Lateral meristem
- Intercalary meristem
2.) The growing tips of stems and roots is the site of apical meristem. It helps in increases the length of the stem and root.
3.) Cambium or lateral meristem is responsible for increase in the girth of the stem or root grows.
4.) Some plants have an intercalary meristem near the node.
Q.3) Describe the function of epidermis?
Ans. 1.) The outermost single layer of plant cells covering the plant surface without any intercellar space is called epidermis.
2.) Usually, epidermal cells are flat with outer and side walls are thicker than the inner wall.
3.) The epidermis is thick in desert plants and secrete waxy substances.
4.) The epidermis has protective function in plants and helps in loss of protection against water loss, mechanical stress and disease protection.
5.) Epidermal cells on the aerialparts of the plant often secrete a waxy, water resistant.
Q.4) Which connective tissue forms framework of the body? State its functions
Ans. Bone is the connective tissue which forms the framework that supports the body. It is known to hold the muscles and support organs of the body. Bones are hard, rigid and not flexible. The bone cells are implanted in a hard calcium and phosphorus containing matrix.
Q.5) State the functions and properties of ligament.
Ans. a.) Ligament is the connective tissue which joins two bones.
b.) Ligament is quite flexible and elastic in nature. It has good tensile strength.
c.) Ligaments have very less amount of matrix
Q.6) Why are skeletal muscles called striated muscles?
Ans. a.) The main function of skeletal muscle is to assist in movement.
b.) They are directly attached to the bones.
c.) When these stained muscle fibers are observed under microscope, striations or alternate light and dark bands are observed.
- ANSWER IN BRIEF (5 MARKS)
Q.1 Distinguish between plant and animal cells.
Ans.
SR. NO | Plants | Animals |
1. | Plants do not perform locomotion. Plants are erect and straight. Plantsutilize less energy than animals. they have a large quantity of supportive tissue made up of dead cells | Animals can perform locomotion to obtain food, mates and shelter. They utilize more energy in comparison to plants.
Animal tissue is usually made up of living cells.
|
2. | Plant growth is restrictedto certain regions. Some plant tissues divide throughout their life. Plants are classified as growing ormeristematic tissue and permanent tissue. | Animal growth ismore uniform compared to plant.The structural organization of organs andorgan systems is far more specialized andlocalized in complex animals than even in verycomplex plants.
|
3. | Plants synthesize their own food. | Animals can not synthesize their own food. |
4. | Plants have adapted a sedentary life. | Animals can show movement.
|
Q.2) Describe the structure and function of cells in vascular bundle.
Ans. 1.) Xylem and phloem are the complex tissues forming the vascular bundle.
2.) They are both conducting vessels in the plants.
3.) The Xylem contains cells like tracheid’s, vessels, xylem parenchyma and xylem fibers.
4.) Tracheid’s and vessels are made up of dead cells and have tube like structure. They have comparatively thick cell walls.
5.) Tracheid’s and vessels transport water and minerals in plants.
6.) Xylem parenchyma stocks up food for the plants.
7.) Xylem fibers have role in proving structural support to the plant.
8.) Phloem comprises of sieve cells, sieve tubes, companion cells, phloem fibers and the phloem parenchyma.
9.) Sieve tubes have small pores in their walls.
10.) Phloem transports food produced in leaves to other parts in plants.
11.) Phloem fibers are the only dead component of phloem
Q.3) Describe in brief components of the epithelial tissue.
Ans. 1.) Epithelium is the protective covering in most organs and body cavities.
2.) Epithelial cells form linings of skin, mouth, blood vessels, lung alveoli and kidney tubules. 3.) Epithelial cells are packed tightly forming a continuous sheet of cells with no intercellular spaces.
4) Types of epithelia:
a.) Simple squamous epithelium: These are flat, thin cells form lining blood vessels or lung alveoli.
The main function is transport of substances through a selectively permeable surface.
b.) Stratified squamous epithelium: in this, skin epithelial cells are arranged in many layers to prevent wear and tear.
c.) Columnar epithelium: This type of cell absorbs and secretes important substances in the inner lining of the intestine. They also bring about movement of food in crossing the epithelial barrier.
d.) Ciliated columnar epithelium: This is a specialized type of columnar epithelium found in the respiratory track.
e.) Cuboidal epithelium: This tissue lines the kidney tubules and ducts of salivary glands providing them with mechanical support.
f.) Epithelial cells are modified to attain special function as gland cells.
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