Xylem

Q.

Stem absorbs water and minerals from the soil. Correct the following statement and rewrite it.

Q.

Which one of the following is not a characteristic feature of bryophytes?

1. Dominant gametophytic generation

2. Vascular tissue

3. Amphibious habitat

4. Filamentous rhizoids

Q.

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

1. Differentiating

2. Maturing

3. Elongating

4. Widening

Q.

Which of the following best describes the difference between phloem transport and xylem transport?

1. Phloem carries fluid from the soil to the leaves, while xylem is the reverse.

2. Phloem movement relies on the water column in plants and is solar powered. Xylem isn't.

3. Phloem can reverse direction, depending on the activity of the "source" and "sink" of its materials. Xylem is more unidirectional

4. Xylem transport requires active pumping at stomata. Phloem doesn't.

Q. Nucellus is made up of which type of cells?

1. None of these
2. Parenchyma cells
3. Sclerenchyma cells
4. Collenchyma cells

Q.

The micronutrient, _______________, is possibly involved in carbohydrate transport and nucleic acid synthesis.

1. molybdinum

2. copper

3. manganese

4. boron

Q.

The other name for xylem is __

Q.

Plasmodesmata are

1. Lignified cemented layers between cells

2. Connections between adjacent cells

3. Locomotory structures

4. Membranes connecting the nucleus and plasmalemma

Q.

The other name for xylem is __

Q.

Why are xylem and phloem called complex tissues?

Q. The tissue having dead cells is

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

Q. Compare set I with set II and mark the incorrect pairs.

Set I	Set II
i. Xylem	bidirectional
ii. Phloem	unidirectional
iii. Turgidity	outward direction
iv. Wall pressure	inward direction

1. i and ii
2. iii and iv
3. i, ii and iii
4. i, ii and iv

Q. When xylem and phloem are separated by a strip of cambium the vascular bundle is called as

1. Collateral and open
2. Collateral and closed
3. Concentric and closed
4. Bicollatoral and open

Q. According to 'histogen theory', during apical organization three histogens are formed. The part differentiated by plerome is

1. Cortex
2. Xylem and phloem
3. Ground tissue system
4. Stele

Q. A vascular bundle in which phloem is on both the sides of the xylem and separated from it by strips of cambium is said to be

1. Collateral open
2. Bi-collateral open
3. Concentric
4. Bi-collateral closed

Q. Articulated latex vessels occur in

1. Hevea
2. Calotropis
3. Euphorbia
4. Tamarindus

Q. Which of the following have sunken stomata?

1. Nerium
2. Mangifera
3. Hydrilla
4. Zea mays

Q. When formation of metaxylem is in a centripetal manner, the xylem is

1. Exarch
2. Endarch
3. Mesarch
4. Radial

Q. Perforated surface plate of water vascular system is

1. Stone canal
2. Madreporite
3. Ring canal
4. Ossicle

Q. Bast fibres are mostly found in

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

Q. All of the following are the functions of xylem tissue, except

1. Translocation of starch from source to sink
2. Transportation of minerals from roots to other parts of plants
3. Providing mechanical strength to the plant parts
4. Conduction of water from roots to leaves

Q. does vessel have perforated cell wall?

Q. Gymnosperms are also called as 'softwood spermatophytes', as they lack

1. Xylem vessels
2. Cambium
3. Thick-walled tracheids
4. Phloem fibres

Q. The tracheids differ from vessels in

1. Thick wall
2. Bordered pit
3. Absence of perforation
4. Spiral thickening

Q.

What is the meaning of xylem lumen?

Q. Sap wood is

1. Inner part of secondary phloem
2. Outer part of secondary phloem
3. Both A and B
4. None of the above

Q. Younger layer of secondary xylem is located

1. In centre of stem
2. Just outside pith
3. Just outside vascular cambium
4. Just inside vascular cambium

Q. When a meristematic tissue "cambium" is present inside a vascular bundle, the bundle is said to be

1. Conjoint
2. Open
3. Closed
4. Collateral

Q. Read the following functions.
$\bullet$ Storage of substances like tannins.
$\bullet$ Radial conduction of water.
$\bullet$ Storage of starch or fat.
All the above given functions are performed by

1. Outermost layer of stele
2. Ground tissue of leaves
3. Innermost layer of cortex
4. A living element of vascular tissue

Q. Which of the following statement is true?

1. Vessels are multicellular and with wide lumen.
2. Vessels are unicelIular and with narrow lumen.
3. Tracheids are unicellular and with wide lumen.
4. Tracheids are multicellular and with narrow lumen.