Anatomy of Flowering Plants · Question 31

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)

A major characteristic of the monocot root is the presence of :

1. Vasculature without cambium
2. Cambium sandwiched between phloem and xylem along the radius
3. Open vascular bundles
4. Scattered vascular bundles

Vascular bundles in monocotyledons are considered closed because

1. There are no vessels with perforations
2. Xylem is surrounded all around by phloem
3. A bundle sheath surrounds each bundle
4. Cambium is absent

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

1. Secondary xylem
2. Protoxylem
3. Secondary phloem
4. Cortical cells