Tissues Class 9 Worksheet Science Chapter 6

Fill in the blanks

(i) A group of cells similar in structure that work together to perform a particular function forms a Tissue.
(ii) Meristematic Tissues are also called Meristems.
(iii) The Meristematic cells in plants are compactly arranged and do not contain any intercellular space between them.
(iv) The Meristematic cells of plant contain few vacuoles or no vacuoles at all.

Multiple Choice Questions (MCQs)

Q 1. A mature sieve tube is different from a vessel in
(a) lacking a functional nucleus
(b) absence of lignin in walls
(c) being dead
(d) lacking cytoplasm.

Correct Answer is Option (b)

Q 2. Simple tissues are 
(a) parenchyma, xylem and collenchyma
(b) parenchyma, collenchyma and sclerenchyma
(c) parenchyma, xylem and sclerenchyma 
(d) parenchyma, xylem and phloem

Correct Answer is Option (b)

Q 3. Generally, plant cell wall is made up of 
(a) Cellulose and pectin
(b) Only cellulose
(c) Chitin
(d) Murein

Correct Answer is Option (b)

Q 4. Enucleated cells at maturity are
(a) Palisade cells
(b) Guard cells
(c) Companion cells
(d) Sieve elements

Correct Answer is Option (b)

Short Answer Questions

Water hyacinth floats on the surface of water due to presence of aerenchyma. It is modified form of parenchyma, which contain air cavities. It provides buoyancy which helps water hyacinth in floating.

Q 2. Animals of colder regions and fisher of cold water have thick layer of subcutaneous fat. Explain, why?

Thick layer of subcutaneous fat act as insulator. It prevents body heat t release in surrounding. Hence, keep their body warms.

Q 3. Define tissue. What is the utility of tissue in multicellular organisms.

Tissue – Group of similar cells performing similar function are called tissue. In living organisms cells are grouped together to perform specific functions.

Q 4. Define due process of differentiation.

In a multicellular organism, cells become specialized to perform different function. These function are taken up by different group of cells According to function of these cells become morphologically different. This phenomenon is known as differentiation.

Q 5. How does the cork act as a protective tissue?

In plants the secondary meristem cuts off many external layers of cells that are dead and arranged in a compact manner. Such layers together make cork. They have deposition of suberin which is very hard and impermeable hence protects plants from unfavorable conditions and microbial attack etc.

Q 6. What is the specific function of the cardiac muscle?

Cardiac muscles are the muscles of heart that pumps blood to all parts of body and the pumping needs rhythmic contraction and relaxation of cardiac muscles throughout the life without any fatigue.

Q 7. Define the term “tissue”.

It is a group of cells similar in origin and structure and they are specialized to perform a particular function like muscle cells in our body form the muscle tissue that bring about body movements (specific function).

Q 8. If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain why?

Plant always loose water from the surface of leaves. This process is known as transpiration. Water reaches leaves by xylem vessels, where evaporation takes place by stomata.

Q 9. What is the utility of tissues in multicellular organisms?

There is a clear cut division of labour in multicellular organisms i.e. different parts of the body of a multicellular organism perform specific functions. For example, brain controls all other parts of body, heart pumps blood to all parts of body, kidneys remove waste materials from body, sense organs collect information from external sources for sensory perception etc. All these functions would never be possible without formation of tissues in multicellular organisms.

Q 10. Give three features of cardiac muscles. 

(1) Cardiac muscles are involuntary i.e. they don’t work under our will.
(2) Its cells are cylindrical, branched, striated and uninucleate.
(3) It shows rhythmic contraction and relaxation throughout the person’s life.