Tag: morphology of root

Questions Related to morphology of root

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

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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

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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

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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

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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. $28$

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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

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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

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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

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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

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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

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Correct Option: A