Anatomy of Flowering Plants · Question 28

Secondary xylem and phloem in dicot stem are produced by

1. vascular cambium
2. axillary meristems
3. apical meristems
4. phellogen

Casparian strips occur in

1. pericycle
2. epidermis
3. endodermis
4. cortex

Plants having little or no secondary growth are

1. deciduous angiosperms
2. grasses
3. cycads
4. conifers

The vascular cambium normally gives rise to :

1. Primary phloem
2. Secondary xylem
3. Periderm
4. Phelloderm

Which of the following is made up of dead cells ?

1. Collenchyma
2. Xylem parenchyma
3. Phellem
4. Phloem

Identify the wrong statement in context of heartwood :

1. It is highly durable.
2. It comprises dead elements with highly lignified walls
3. It conducts water and minerals efficiently
4. Organic compounds are deposited in it

Specialised epidermal cells surrounding the guard cells are called -

1. Lenticels
2. Complementary cells
3. Bulliform cells
4. Subsidiary cells

Cortex is the region found between -

1. endodermis and pith
2. endodermis and vascular bundle
3. epidermis and stele
4. pericycle and endodermis

The balloon-shaped structures called tyloses

1. are extensions of xylem parenchyma cells into vessels
2. originate in the lumen of vessels
3. are linked to the ascent of sap through xylem vessels
4. characterize the sapwood

Read the different components from (1) to (4) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem : (1) Secondary cortex (2) Wood (3) Secondary phloem (4) Phellem The correct order is :

1. (3), (4), (2), (1)
2. (4), (1), (3), (2)
3. (4), (3), (1), (2)
4. (1), (2), (4), (3)