Differentiation

Q.

Why do meristematic tissues lack vacuoles?

Q.

Give the location of the following tissues:

(a) Cartilage

(b) Cardiac muscles

(c) Parenchyma

(d) Sclerenchyma

(e) Meristematic tissue

Q.

Assertion: Permanent tissue is composed of mature cells.
Reason: Meristematic tissue is a group of actively dividing cells.

1. If both Assertion and Reason are correct and Reason is the
   correct explanation of Assertion.

2. If both Assertion and Reason are correct, but Reason is not
   the correct explanation of Assertion.

3. If Assertion is correct but Reason is incorrect.

4. If Assertion is incorrect but Reason is correct.

Q. Question 52
Give reasons for
(a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
(b) Intercellular spaces are absent in sclerenchymatous tissues. (c) We get a crunchy and granular feeling, when we chew pear fruit.
(d) Branches of a tree move and bend freely in high wind velocity.
(e) It is difficult to pull out the husk of a coconut tree.

Q.

With respect to the given assertion and reason, choose the correct option.
Assertion (A): The process in which meristematic cells attain permanent shape, size and function is called differentiation.
Reason (R): Cells of meristematic tissue differentiate to form different types of permanent tissue.

1. A is correct but R is incorrect
2. Both A and R are incorrect
3. A is incorrect and R is correct
4. Both A and R are correct and R is the correct explanation of A

Q. The presence of which chemical make the cork impervious to gases and water?

1. Lignin
2. Cellulose
3. Suberin
4. Pectin

Q.

__ (Meristematic / Permanent) tissue are made up of cells which have lost their ability to multiply.

Q. The process in which meristematic tissue takes up a permanent shape, size and function is called as ___.

1. continuation
2. differentiation
3. division
4. integration

Q.

What is meant by differentiation?

Q.

Why is it called differentiation?

Q.

The cells of cork are dead and have a chemical in their walls that makes them impervious to gases and water. The chemical is called ________.

1. lignin

2. wax

3. suberin

4. cutin

Q.

__________ tissues are found on the surface of roots, stems and leaves.

1. Supporting

2. Protective

3. Conducting

4. Meristematic

Q.

Question 52
Give reasons for
(a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack a vacuole.
(b) Intercellular spaces are absent in sclerenchymatous tissues.

(c) We get a crunchy and granular feeling when we chew pear fruit.
(d) Branches of a tree move and bend freely in high wind velocity.
(e) It is difficult to pull out the husk of a coconut tree.

Q. What are the different types of meristematic tissues based on origin and development?

Q.

Is it possible for a permanent tissue to become a meristematic tissue?

Q.

With respect to the given assertion and reason, choose the correct option.
Assertion (A): The process in which meristematic cells attain permanent shape, size and function is called differentiation.
Reason (R): Cells of meristematic tissue differentiate to form different types of permanent tissue.

1. A is correct but R is incorrect
2. A is incorrect and R is correct
3. Both A and R are correct and R is the correct explanation of A
4. Both A and R are incorrect

Q.

Explain how the meristematic tissues adapt to Rapid cell division?

Q. Identify the characteristics of sclerenchyma cells.

1. Narrow
2. Wide
3. Small
4. Dead
5. Lignified
6. Stretchable
7. Woody
8. Unstretchable

Q. What is meant by
merstimatic tissues divide in a particular plane

Q.

explain how the meristematic tissues adapt to rapid cell division

Q. Identify the characteristics of sclerenchyma cells.

1. Unstretchable
2. Dead
3. Stretchable
4. Wide
5. Narrow
6. Small
7. Lignified
8. Woody

Q. How does the meristematic tissue adapt to rapid cell division? Why do they lack vacuoles?

Q.

What happens to the cells formed by division of meristematic tissue?

1. They differentiate to form anucleate cells.

2. They differentiate to form permanent tissue.

3. They initiate plant growth.

4. They form dead cells.

Q. Match the following

1. Conducts water
2. Conducts food
3. Exchange of gases

Q.

The cork cells have ____ to make them impervious to gases and water.

Q. Value based questions.
During a meristem culture some explants were kept in culture medium containing more of
auxins than cytokinins. Which organ of the plant is expected to differentiate from the cells?

Q.

What happens to the cells formed by division of meristematic tissue?

1. They form permanent tissue which can divide.

2. They differentiate to form permanent tissue.

3. They initiate plant growth.

4. None of the above.

Q. The process during which meristematic tissue takes up a permanent shape, size and function is called _____.

1. Division
2. Continuation
3. Differentiation
4. Integration

Q.

What is the basic principle on which plant tissues are categorise as meristematic and permanent tissues?

1. Ability to perform photosynthesis.

2. Ability to divide.

3. Ability to move.

4. Complexity to perform a function.

Q.

What happens to all the meristematic tissue after they are formed?