Dedifferentiation

Q.

Difference between phellogen and phelloderm and phellum?

Q.

Interfascicular cambium and cork cambium are formed due to

(a) cell division

(b) cell differentiation

(c) cell dedifferentiation

(d) redifferentiation

Q.

Question 29:

Explain in 2-3 line of the following term with the help of of examples taken from different plant tissues.
Differentaition

De-differentiation

Re-differentiation

Q. The process of developing permanent cells from meristematic cells which are produced from permanent cells itself is

1. Differentiation

2. Redifferentiation

3. Dedifferentiation

4. Degeneration

Q. In angiosperm the following events occurs during secondary growth. Arrange these events in correct sequence :

(a)Formation of secondary xylem and secondary phloem
(b)Dedifferentiation in primary medullary ray
(c)Formation of cork and secondary cortex
(d)Formation of vascular cambium

1. b, d, c, a
2. d, c, a, b
3. d, b, a, c
4. b, d, a, c

Q. Identify X.
Differentiation : Parenchyma Dedifferentiation : X

1. Interfascicular cambium
2. Cork cambium
3. Both a and b
4. Collenchyma

Q. The formation of secondary meristems; interfascicular cambium and cork cambium from differentiated parenchyma cells is dedifferentiation.

1. True

2. False

Q.

Does Pfr stop flowering?

Q. Dedifferentiation is regaining the process of

1. growth of the cell in size
2. none of the above
3. division of differentiated cells
4. senescence of differentiated cells

Q.

A phenomenon by which a permanent plant tissue acquires meristematic property is _______.

1. Redifferentiation

2. Dedifferentiation

3. Differentiation

4. Regeneration

Q. Dedifferentiation is regaining the process of

1. division of differentiated cells
2. senescence of differentiated cells
3. growth of the cell in size
4. none of the above

Q. Find out the correct sentences.

1. Parenchymatous tissue have intercellular spaces.
2. Collenchymatous tissue are irregularly thickened at corners.
3. Apical and intercalary meristems are permanent tissues.
4. Both A and B

Q. Match column I with column II, and choose the correct combination from the options given below.

	Column I		Column II
a	Cellular barrier	1	Natural killer
b	Physiological barrier	2	Interferons
c	Cytokine barrier	3	Skin
d	Physical barrier	4	Tears from eyes

1. $abcd2341$
2. $abcd1423$
3. $abcd1324$
4. $abcd3241$

Q. In angiosperm the following events occurs during secondary growth. Arrange these events in correct sequence :

(a)Formation of secondary xylem and secondary phloem
(b)Dedifferentiation in primary medullary ray
(c)Formation of cork and secondary cortex
(d)Formation of vascular cambium

1. b, d, a, c
2. b, d, c, a
3. d, c, a, b
4. d, b, a, c

Q. __________ are the examples of tissues, formed by dedifferentiation.

1. Both (a) and (b)
2. Cork cambium
3. Interfascicular cambium
4. Tracheary elements

Q. Formation of cork cambium from fully differentiated parenchyma cell is an example of

1. Differentiation
2. Dedifferentiation
3. Redifferentiation
4. None of the above

Q.

Which cells represent the stage of elongation?

Q. If a part of pith from the stem of a plant is used as an explant and cultured on nutrient medium, which of the following processes is responsible for the formation of an undifferentiated mass of cells called callus?

1. Growth
2. Differentiation
3. Redifferentiation
4. Dedifferentiation

Q. An important effect of ethylene is to cause maturation of

1. leaf primordia
2. root meristem from parenchyma cells
3. fruits
4. the vascular cambium

Q. Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cells. Of the following, which cells are least likely to be replaced by new cells?

1. Liver cells
2. Epidermal layer of the skin
3. Neurons
4. Osteocytes

Q. Living differentiated cells which have otherwise lost the capacity to divide, can regain the power of division under certain conditions. This phenomenon is termed as

1. Differentiation
2. Dedifferentiation
3. Redifferentiation
4. Development

Q. The living differentiated cell which have lost capacity to divide can regain capacity of division under certain conditions. This phenomenon is called

1. De-differentiation
2. Differentiation
3. Re-differentiation
4. Regeneration

Q. The cells derived from meristems differentiate and regain the capacity to divide by a phenomenon called

1. Differentiation
2. Dedifferentiation
3. Totipotency
4. Redifferentiation
5. Regeneration

Q. Mature differentiated cells revert to meristematic activity to form callus by

1. Differentiation
2. Cytodifferentiation
3. Redifferentiation
4. Dedifferentiation

Q. The process in which mature differentiated cells reverse to meristematic activity to form callus is called

1. Dedifferentiation
2. Cytodifferentiation
3. Differentiation
4. Redifferentiation