Tag: evs

Quizzes (439) Questions (4580)

Questions Related to evs

Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Lateral roots arise from primordia developed by division of

  1. Pericycle cells in between two protoxylem points

  2. Pericycle cells opposite protoxylem points

  3. Endodermis cells in between two protoxylem points

  4. Endodermis opposite protoxylem points
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lateral roots arise endogenously from other roots and increase the absorptive surface of the plant. Most lateral roots are initiated some distance basipetal to the apical meristem, differentiated cells must become reprogrammed to give rise to the initial divide and enlarge in very precise patterns to organize a new organ recognizable as a root. 

Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Root hair develop from

  1. Zone of cell maturation

  2. Zone of cell elongation

  3. Zone of mature cells

  4. Zone of cell formation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The region of maturation is located at the top of the root, or closest to the plant. The end of the root is known as the root cap. A plant cell will begin in the region of cell division, and then travel to the region of elongation. In this zone, a cell will elongate and then travel to the zone of maturation. Root hair cells are outgrowths at a tip of the plant's roots. They are found only in the zone of maturation, and not the zone of elongation, possibly because any root hairs that arise are sheared off as the root elongates and moves through the soil.

So, the correct answer is 'A'.
Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Cells of quiescent centre have lower concentration of

  1. DNA

  2. Proteins

  3. RNA

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The quiescent centre is that part of the root-promeristems that contains the initials of epidermis, cortex and stele which divides less frequently and are present at the pole of cortex and stele.
  • In closed meristems, QC is hemispherical in shape whereas, in open meristem it is disc-shaped. 
  • The cells with QC have small dictyosomes, nuclei and nucleoli. 
  • These cells also have little endoplasmic reticulum, mitochondria and contain low concentrations of RNA, DNA and protein than the other cells of the root apex.
  • So, the correct answer is 'All of the above'.
Multiple choice evs identifying the plants absorption of water from the soil root system the root system

In case tunica, is multilayered which is likely to happen?

  1. All layers take part in formation of multilayered epidermis

  2. All the layers produce cortex

  3. Outer most layer forms hypodermis, middle layer cortex and inner layer endodermis

  4. Only the outermost layer forms the epidermis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the tunica is multilayered, the condition is called multistratose tunica. The layers of tunica can be designated as L1, L2, L3 and so forth. The L1 or the outermost layer of the tunica would give rise to the epidermis and the rest of the layers would form the cortex and the vascular tissues, as seen in Datura.

Hence, the correct answer is 'Only the outermost layer forms the epidermis'.

Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Quiescent centre occurs in

  1. Shoot apex

  2. Root apex

  3. Both A and B

  4. Meristematic tissue
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The root-promeristems of higher plants have a central part called the quiescent centre.
  • The cells here divide less frequently as they are inactive and are present at the pole of cortex and stele.
  • They may consist of four cells (minimum) or can go up to 600 cells which show very low mitotic activity.
  • In closed meristem, QC is hemispherical in shape whereas, in open meristem it is disc-shaped.
  • The QC is unusual in the centre of shoots.
So, the correct answer is 'Root apex'
Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Quiescent centre is region of root apex which is

  1. Actively dividing

  2. Water absorption area

  3. Inactive cells

  4. Root hair area
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The quiescent centre is that part of the root-promeristems that contains the initials of epidermis, cortex and stele.
  • These cells divide less frequently as they are inactive and are present at the pole of cortex and stele.
  • The cells with QC have small dictyosomes, nuclei and nucleoli. 
  • These cells also have little endoplasmic reticulum, mitochondria and contain low concentrations of RNA, DNA and protein than the other cells of the root apex.
So, the correct answer is 'Inactive cells'
Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Cells of quiescent centre are characterised by

  1. Dense cytoplasm and prominent nuclei

  2. Light cytoplasm and small nuclei

  3. Dividing regularly to add to the corpus

  4. Dividing regularly to add to tunica
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The quiescent centre or QC is a part of the root-promeristems that contains the initials of epidermis, cortex and stele.
  • The cells here divide less frequently as they are inactive and are present at the pole of cortex and stele.
  • The cells with QC have small dictyosomes, nuclei and nucleoli with little cytoplasm.
  • These cells also have little endoplasmic reticulum, mitochondria and contain low concentrations of RNA, DNA and protein than the other cells of the root apex.
  • So, the correct answer is 'Light cytoplasm and small nuclei'.
Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Calyptrogen gives rise to

  1. Root

  2. Root cap

  3. Plerome

  4. Periblem
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The root apical meristem gives rise to three primary meristems- procambium, ground meristem, protoderm and the root cap
  • Calyptrogen is a specialized internal meristematic cell derived from the root apical meristem
  • They divide internally to produce a protective cap-like structure at the root tip called the root cap
  • The root cap is also known as calyptra
So, the correct answer is 'Root cap'
Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Rootlets are called as

  1. Tap root

  2. Adventitious roots

  3. Lateral roots

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rootlets are also called as lateral root and are defined as the small branches of roots that form from the main root and helps the plant for the absorption of water and minerals as they increase surface area.

So, the correct option is 'Lateral roots'.