Tag: root - external morphology

Quizzes (4) Questions (139)

Questions Related to root - external morphology

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.

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

Read the following four statements:
(A) A simple experiment called girdling was used to identify the tissue through which food is translocated.
(B) Plant factors that effect transpiration include temperature, light, wind velocity and humidity.
(C) Most of the water flow in root occur via apoplast.
(D) In young root, water directly enters into the xylem vessels.
How many of the above statements are right?

  1. Four

  2. Three

  3. Two

  4. One
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Mycorrhizal association controls root affecting pathogens in plants because.

  1. Mychorrhizal fungi colonize the roots and acts as a barrier during infection

  2. Mychorrhizal fungi helps in phosphorus uptake

  3. Mychorrhizal fungi help during stress and shock

  4. Mychorrhizal fungi produce toxins against pathogens
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mycorrhizal fungi form a physical mantle or network around the roots, which acts as a physical barrier against soil-borne pathogens, in addition to aiding in nutrient uptake.

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

Select the incorrect match with respect to the plant and the relative plant part modified for food storage.

  1. Lathyrus odoratus (sweet potato) - Root

  2. Solanum tuberosum (potato) - Stem

  3. Allium cepa (onion) - Leaves

  4. Dahlia (Dahlia) - Leaves
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The incorrect match is: 

Dahlia(Dahlia) - Leaves
So, the correct answer is (d).