Xylem

Q.

How is food transported in plants?

Q.

Diferentiate between hard wood and sap wood

Q.

What is Lignin?

Q. Root pressure develops due to:

1. Increase in transpiration
2. Active absorption
3. Low osmotic potential in soil
4. Passive absorption

Q.

What does obliterated central lumen mean?

Q.

What are vessels in plants?

Q.

Why are xylem and phloem called complex tissues?

Q. Identify types of vascular bundles in given figures A, B and C.

1. $\begin{array}{ccc}\text{A}& \text{B}& \text{C}\\ \text{Radial}& \text{Conjoint closed}& \text{Conjoint open}\end{array}$
2. $\begin{array}{ccc}\text{A}& \text{B}& \text{C}\\ \text{Conjoint open}& \text{Conjoint closed}& \text{Radial}\end{array}$
3. $\begin{array}{ccc}\text{A}& \text{B}& \text{C}\\ \text{Conjoint closed}& \text{Conjoint open}& \text{Radial}\end{array}$
4. $\begin{array}{ccc}\text{A}& \text{B}& \text{C}\\ \text{Bicollateral}& \text{Concentric}& \text{Radial}\end{array}$

Q.

Vascular bundles in monocotyledons are considered closed because

1. There are no vessels with perforations

2. Cambium is absent

3. A bundle sheath surrounds each bundle

4. Xylem is surrounded all around by phloem

Q.

Why xylem and phloem are called complex tissue?

Q.

What is the function of the xylem in ferns?

Q. Maximum absorption of minerals in plants takes place by which region of root?

1. Maturation zone
2. Elongation zone
3. Meristematic zone
4. Root cap zone

Q. Select the mismatch.

A.	Cycas	Dioecious
B.	Salvinia	Heterosporous
C.	Equisetum	Homosporous
D.	Pinus	Dioecious

Q.

In plants, water is transported through

1. xylem

2. phloem

3. stomata

4. root hair

Q.

Is osmosis facilitated diffusion?

Q. The youngest layer of secondary xylem in the wood of dicot plant is located:

1. Between pith and primary xylem
2. Just outside of vascular combium
3. Just inside of vascular combium
4. Just inside of cork combium

Q. Transport over long distances in trees proceeds through

1. Sclerenchyma
2. xylem
3. xylem and phloem
4. phloem

Q.

Why is long-distance transport important for vascular plants?

Q. In part A of a plant, sugars are actively transported into the phloem tissue. In part B, sugars are actively transported out of the phloem. Which way will the phloem sap move under these
conditions?

1. First from A to B; then, once the pressure builds up, from B to A
2. First from B to A; then, once the pressure builds up, from A to B
3. From A to B
4. From B to A

Q.

Why there are pores present at the perforation plate in vessels?

Q.

Balloon-like expansions of xylem parenchyma into the lumen of the vessels in secondary xylem are called _______

1. Pits

2. Tyloses

3. Plasmodesmata

4. Lumen

Q.

What do you mean by closed vascular bundle?

1. Presence of cambium

2. Presence of periderm

3. Absence of cambium

4. None of the options

Q. Tracheids are less efficient than vessels due to

1. absence of closed-end walls
2. uneven thickenings
3. casparian strips
4. presence of tapering end walls

Q. Bidirection translocation of minerals in plants takes place through

1. Xylem
2. Phloem
3. Parenchyma
4. Cambium

Q.

A transverse section of stem is stained first with safranin and then with fast green following the usual schedule of double staining for the preparation of a permanent slide. What would be the colour of the stained xylem and phloem?

(a) Red and green

(b) Green and red

(c) Orange and yellow

(d) Purple and orange

Q. Match the physiological phenomena in Column I with the structures involved in Column II and indicate the correct choice
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \left(A\right)& \text{Ascent of sap}& \left(P\right)& \text{Hydathodes}\\ \left(B\right)& \text{Translocation of organic solutes}& \left(Q\right)& \text{Chlorenchyma}\\ \left(C\right)& \text{Transpiration}& \left(R\right)& \text{Xylem}\\ \left(D\right)& \text{Guttation}& \left(S\right)& \text{Stomata}\\ & & \left(T\right)& \text{Phloem}\end{array}$

1. A=R, B=T, C=S, D=Q
2. A=T, B=R, C=S, D=P
3. A=R, B=T, C=P, D=S
4. A=R, B=T, C=S, D=P

Q. The tissue having dead cells is

1. Phellogen
2. Xylem
3. Parenchyma
4. Collenchyma

Q. The living tissue in xylem helps in transport of water.

1. True

2. False

Q. Algal zone is characteristic of:

1. Normal roots f Cycas
2. Roots of Pinus
3. Stem of Cycas
4. Coralloid roots of Cycas

Q.

Name the following:

The common name of xylem and the phloem.