Tag: modifications of root

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Multiple choice botany root - external morphology root system in plants modifications of root root modifications

The association of Nitrogen fixing bacteria (nodule bacteria) with leguminous roots is known as 

  1. Saprophytism

  2. Symbiosis

  3. Epiphytism

  4. Parasitism
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Symbiosis is a type of association of dissimilar organisms of their mutual advantage, e.g., association of nitrogen-fixing bacteria (nodule bacteria) with leguminous roots. The bacteria, inhabiting nodules on roots manufacture compounds from the nitrogen of the air, which becomes available to the plant. From the plant, bacteria obtain carbohydrates and other food materials.

Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Baderoids are

  1. Enlarged non-motile cellular bacteria Rhizobium

    leguminosarum in root nodules of legumes

  2. A bacterial cell infected with viruses

  3. A motile bacterium

  4. Nitrosomonas bacteria in soil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacteroid : Symbiotic bacteria Rhizobium leguminosarum in leguminous plants e.g., gram, pea etc. in their roots nodules produce Leg haemoglobin  this whole Bacteria + Leg haemoglobin + Polyploide  cells of roots is called as bacteroid. 


Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Select the correct statements.
(a) From the region of elongation, some of the epidermal cells form root hairs.
(b) Pneumatophores are seen in Sonneratia.
(c) Adventitious roots are seen in Banyan tree.
(d) Maize and Sugarcane have prop roots.

  1. a and d

  2. a, c and d

  3. c and d

  4. b and c

  5. a, b and d
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pneumatophores are specialized respiratory roots found in mangroves like Sonneratia, and Banyan trees exhibit adventitious roots (prop roots). Statement (a) is wrong because root hairs arise from the maturation zone, not the elongation zone.

Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Peculiarity of Dalbergia tap root system is?

  1. Surface feeder

  2. Presence of nodules

  3. Formation of buds

  4. Lenticels for aeration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dalbergia is the fast-growing, hardy and surface feeder tap root. They are having a long taproot and numerous surface roots as well. In surface feeders, the taproot does not grow or develop to a great extent.

The cymose or surface feeder tap root systems of some annual plants are consisting of thin fibrous roots. Therefore, also called a fibrous tap root system.

The correct option is A.

Multiple choice botany root - external morphology root system in plants modifications of root root modifications

In Tinopsora, the adventitious roots are.

  1. Hanging

  2. Green

  3. Both A and B

  4. Clinging in nature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Modified adventitious roots, which become green colour and perform photosynthesis. These are called as assimilatory roots, for example, Taeniophyllum, Trapa, Tinospora cordifolia. Tinospora is having climbing photosynthetic roots and is aerial. These are like the green hanging threads developing from the nodes during the rainy seasons.

The correct answers are A and B both. 

Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Assertion : Allelopathy is a form of ammensalism that occurs in plants

Reason : Association of rooting plants with fungal hyphae, is an important example of ammensalism.


  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Allelopathy is a phenomenon associated with plants, in which one plant produce some chemical substances, which inhibits the growth of other plant species. While, in ammensalism, one species suffer and other remain unaffected.