Tag: root system in plants

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Questions Related to root system in plants

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

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. 

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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 

  1. (i) and (ii) only

  2. (ii) and (iii) only

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

  4. (i), (ii), (iii) and (iv)
Reveal answer Fill a bubble to check yourself
C Correct answer
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)'.

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

Root hair is always.

  1. Very long

  2. Multi cellular

  3. Cuticularized

  4. Unicellular
Reveal answer Fill a bubble to check yourself
A,D Correct answer
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'.
Multiple choice botany root - external morphology zones of the root morphology of root root system in plants

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

  1. epidermis

  2. cortex

  3. vascular cylinder

  4. pith
Reveal answer Fill a bubble to check yourself
B Correct answer
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".

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

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

  1. dicot root

  2. monocor root

  3. dicot stem

  4. both dicot and monocot roots
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Radial vascular bundles, where xylem and phloem are arranged in alternating radii, are a characteristic feature of the primary structure of both dicot and monocot roots.

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

In many plants the tap root becomes swollen and assume various forms. Match the following.

Plant Type of Root
A. Carrot 1. Conical
B. Mirabilis  2. Fusiform
C. Radish 3. Napiform
D. Turnip 4. Tuberous

  1. A - 1, B - 4, C - 2, D - 3

  2. A - 2, B - 3, C - 1, D - 4

  3. A - 4, B - 1, C - 3, D - 2

  4. A - 3, B - 2, C - 1, D - 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

1.The conical fleshy tap root resembles a cone, that is, the thickest towards base and gradually tapering towards the apex, e.g., Carrot (Daucus carota) 2.The fusiform fleshy root is like a spindle, that is, thickest roughly in the middle and narrow towards both its base and apex, e.g., Radish (Raphanus sativus). 3.The napiform fleshy root is very thick at the base and is almost spherical. It suddenly thins out towards the apex (top-like), e.g., Turnip (Brassica rapa ) 4.The tuberous roots are those thickened tap roots which do not assume any definite form, e.g., Mirabilis jalapa (Four O’ Clock). So, the correct option is A. (A - 1, B - 4, C - 2, D - 3)

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

Identify the correct pair of plants which produce pneumatophores : 

  1. Heritiera fomes and Dahlia bybrida

  2. Heritiera fomes and Ceriops roxburghiana

  3. Ceriops roxburghiana and Asparagus racemosus

  4. Tinospora cordifolia and Ipomoea batatus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is option B i.e. "Heritiera fomes and Ceriops roxburghiana"
Pneumatophores (breathing roots) are modification of root that assist in respiration whenever there is water lodging near root. They are found in halophytes (plants which grow in saline conditions) and mangroves. In mangrove families like Heritiera fomes and Ceriops roxburghiana, pnematophores acts as an organ of gaseous exchange.

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

A partial (stem or root) parasitic plant is one which

  1. Draws food from host only at certain times

  2. Takes both water and nutrients from host plant

  3. Takes only water from host plant

  4. Uses the host just for support
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Partial parasitic plants have chlorophyll which helps them to produce organic substances they require. They depend on the host for water and minerals, sometimes few chemical substances required for their growth. So, the correct option is B. ( Takes both water and nutrients from host plant )