Secondary meristems are found in

1. All angiosperms

2. Gymnosperms and all monocots

3.Dictos and gymnosperms

4. All spermatophytes

During the secondary growth in the dicot stem, the cambial ring becomes active and begins to cut off new cells both towards the inner and the outer sides. The cells cut off

1. Towards pith, mature into secondary phloem

2. Towards the periphery, mature into secondary xylem

3. Towards pericycle, mature into secondary xylem as well as secondary phloem

4. Mature into secondary vascular tissues

Which of the above statement(s) is/are correct?

1. a & b are correct

2. b & c are correct

3. Only a is correct

4. Only c is correct

Select the odd one out with respect to tissues

1. A group of cells having a common origin

2. They usually perform a common function

3. Complex tissues are made of more than one type of cells

4. They are not capable of division

During secondary growth in dicot root 

1. Vascular cambium arises completely from conjunctive parenchyma

2. Growth rings are distinct with spring wood alternating with autumn wood 

3. Phellogen arises from the epidermis

4. Vascular cambium is complete and continuous wavy ring 

Arrange the following diagrams in correct order according to the events occurring during secondary growth in dicot stem.

1. b, d, c, a

2. b, a, d, c

3. d, a, b, c

4. d, b, a, c  

All are the features of heart wood, except 

A. Forms greater part of secondary xylem in old trees.

B. Light in colour.

C. Constitutes peripheral region of secondary xylem.

D. It is hard and durable due to deposition of organic compounds, essential oils etc.

E. It is physiologically active and is comprised of living elements.

F. Involved in the conduction of water and minerals from root to leaf 

1. A, D & F

2. B, C, E & F

3. D, E & F

4. B, D & E

Heart wood is differentiated from sap wood in being 

1. Peripheral in position 

2. Resistant to the attack of microorganisms and insects 

3. Lighter in colour and dignified 

4. hard, durable and help in conduction of water 

Which of the following structures labelled as A, B, C and D represents complete and continuous wavy ring of vascular cambium?

1. A

2. B

3. C

4. D

Secondary medullary rays are 

1. Narrow band of parenchyma

2. Arranged transversely

3. Dead and dignified 

4. Formed by primary cambium