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Zones of the root - class-XI

Description: zones of the root
Number of Questions: 16
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Tags: botany morphology of flowering plants root - external morphology biology morphology of flowering plants and their function vegetative morphology
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Choose the incorrect statement.

botany root - external morphology zones of the root morphology of root root system in plants

  1. Epiphytic roots and Vanda has well developed root cap and root hair

  2. Tinospora and Trapa possess assimilatory roots

  3. Cuscuta is a parasitic plant

  4. Saccharum and Zea mays possess still toots

Show answer
Correct Option: A

Hairy root disease of dicot plants is caused by

botany root - external morphology zones of the root morphology of root root system in plants

  1. Agrobacterium tumefaciens

  2. Agrobacterium rhizogene

  3. Bacillus thuringiensis

  4. Meloidogyne incognita

Show answer
Correct Option: B
Explanation:
  • A soil bacterium Agrobacterium rhizogenes causes “hairy root” disease in some dicotyledonous plants(For example, capsicum species).
  • A bacterial Ri (root inducing) plasmid integrates its transfer-DNA (T-DNA) into the plant genome (DNA). As a result, rapidly growing and intensely branched (hairy) adventitious roots are developed.
  • Hence Hairy root disease of dicot plants is caused by Agrobacterium rhizogene.
  • So, the correct answer is 'Agrobacterium rhizogene'.

Clowes observed a central cup like region of passive cells in the root tip of Zea mays which lies in between?

botany root - external morphology zones of the root morphology of root root system in plants

  1. Root cap and active root meristem

  2. Protoderm and procambium

  3. Cork cambium and quiescent centre

  4. Quiescent centre and calyptrogen

Show answer
Correct Option: A

Root cap is absent in

botany root - external morphology zones of the root morphology of root root system in plants

  1. Hydrophytes

  2. Lithophytes

  3. Xerophytes

  4. Mesophytes

Show answer
Correct Option: A
Explanation:

Root caps are present in terrestrial plants to protect the root tip from breaking away as they grow deeper through the layers of the soil. However,the roots of hydropytes that are floating or submerged do not have to grow through the abrasive layers of soil, as the roots are floating in water or the soil is soft and water logged.

So, the correct answer is 'Hydrophytes'

Number of chromosomes in root cell is $14$. What will be the number in synergid?

botany root - external morphology zones of the root morphology of root root system in plants

  1. $14$

  2. $21$

  3. $7$

  4. $28$

Show answer
Correct Option: C

The origin of root hairs and lateral roots is ___________________.

botany root - external morphology zones of the root morphology of root root system in plants

  1. Exogenous and endogenous respectively

  2. Endogenous and exogenous respectively

  3. Both endogenously

  4. Both exogenously

Show answer
Correct Option: A

Select a correct set.

botany root - external morphology zones of the root morphology of root root system in plants

  1. Vanda - Tap root - Moisture absorption

  2. Jasmine - Offset - Photosynthesis

  3. Pineapple - Sucker - Propagation

  4. Nepenthes - Leaf tip - Photosynthesis

Show answer
Correct Option: A

How many divisions must occur in a cell of root tip to form 128 cells ?

botany root - external morphology zones of the root morphology of root root system in plants

  1. 128

  2. 127

  3. 64

  4. 3

Show answer
Correct Option: B
Explanation:
Root tip cells are somatic cells. Therefore, it will divide by mitotic division.
$1$ parent cell with form $2$ daughter cells. Then, we can calculate after $127$ divisions of cells it will form $128$ cells.
Therefore, the option (B) is correct.

Rearrange the following series as seen in the rest in vertical section and choose the correct option:
(a) Rest hair zone  (b) zone of meristem
(c) Rest cap zone   (d) zone of maturation
(e) zone of elongation

botany root - external morphology zones of the root morphology of root root system in plants

  1. c, b, e, a, d

  2. a, b, c, d, e

  3. d, e, a, c, b

  4. e, d, c, b, a

Show answer
Correct Option: A

Rearrange the following zones as seen in the root in vertical section and choose the correct options.


A. Root hair zone  B. Zone of meristems
C. Root cap zone  D. Zone of maturation
E. Zone of elongation

botany root - external morphology zones of the root morphology of root root system in plants

  1. C, B, E, A, D

  2. A, B, C, D, E

  3. D, E, A, C, B

  4. E, D, C, B, A

Show answer
Correct Option: A
Root cap in monocots is formed by
botany root - external morphology zones of the root morphology of root root system in plants

  1. dermatogen

  2. calyptrogen

  3. vascular cambium

  4. wound cambium

Show answer
Correct Option: B
Explanation:

Root cap in monocots is formed by 'calyptrogen'.

So the correct answer is 'calyptrogen'.

Statement 1: Root cap protects the root meristem from the friction of the soil and its outer cells are continuously replaced by never ones.
Statement 2: The effect of the soil-friction damages the outer cells of root cap which are peeled off and replaced by new cells produced by root meristem. 

botany root - external morphology zones of the root morphology of root root system in plants

  1. Both statement 1 and 2 correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statement 1 and 2 incorrect.

Show answer
Correct Option: A
Explanation:

Both the statements are correct. So, the correct answer is (a).

Read the given statements and select the correct ones.
(i) Root caps are present in prop roots. 
(ii) Pneumatophores help to get oxygen for respiration
(iii) Edible part of ginger is underground stem.
(iv) Hydrophytes usually possess a well developed root system 

botany root - external morphology zones of the root morphology of root root system in plants

  1. (i) and (ii) only

  2. (ii) and (iii) only

  3. (i), (ii) and (iii)

  4. (i), (ii), (iii) and (iv)

Show answer
Correct Option: C
Explanation:

Following are the correct statements: 

(i) Root caps are present in prop roots.
(ii) Pneumatophores help to get oxygen for respiration.
(iii) The edible part of ginger is the underground stem.
So, the correct answer is '(i), (ii) and (iii)'.

Root hair is always.

botany root - external morphology zones of the root morphology of root root system in plants

  1. Very long

  2. Multi cellular

  3. Cuticularized

  4. Unicellular

Show answer
Correct Option: A,D
Explanation:
Root is typically a non-green underground cylindrical structure forming the descending water absorbing axis of the plant which gives rise to endogenous branches and does not possess nodes, leaves and buds. Each functional root is covered at the tip by a root cap. Near their tip the finer roots bear unicellular tubular root hair.
So the correct answer is 'Unicellular'.

Choose the correct answer from the alternatives given.
Root nodules are formed from the cells of:

botany root - external morphology zones of the root morphology of root root system in plants

  1. epidermis

  2. cortex

  3. vascular cylinder

  4. pith

Show answer
Correct Option: B
Explanation:

The bacteria enter the developing nodule through a structure called an infection thread, which grows through the root hair into the basal part of the epidermal cell, and onwards into the root cortex.

So the correct answer is "cortex".

Choose the correct answer from the alternatives given.
Radial vascular bundles are found in:

botany root - external morphology zones of the root morphology of root root system in plants

  1. dicot root

  2. monocor root

  3. dicot stem

  4. both dicot and monocot roots

Show answer
Correct Option: D
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