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 

 

Identify the mismatched pair:

	Tissue	Feature
1.		Thick walled, elongated and pointed cells present in hypodermis of dicot stem
2.		Forms the major component within plant organs
3.		Commonly found in pulp of fruits like guava, pear and sapota
4.		Provide mechanical support to growing parts of plant

Mark the incorrect statement with respect to guard cells in stomata

1. In grasses these are dumb-bell shaped

2. They possess chloroplasts

3. Regulate opening and closing of stomata

4. Outer walls are thick and inner walls are thin in dicots 

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

Well developed pith is present in 

1. Dicot stem, monocot root

2. Monocot stem, dicot root

3. Dicot root, dicot stem

4. Monocot root, monocot stem

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

Which among the following cannot be a feature of given diagram?

1. It is a long cylindrical tube like structure

2. Having lignified walls

3. having large central cavity

4. Having protoplasm

Secondary medullary rays are 

1. Narrow band of parenchyma

2. Arranged transversely

3. Dead and dignified 

4. Formed by primary cambium