Tag: root - external morphology

Questions Related to root - external morphology

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

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

  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

Show answer
Correct Option: A
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)

Identify the correct pair of plants which produce pneumatophores : 

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

  1. Heritiera fomes and Dahlia bybrida

  2. Heritiera fomes and Ceriops roxburghiana

  3. Ceriops roxburghiana and Asparagus racemosus

  4. Tinospora cordifolia and Ipomoea batatus

Show answer
Correct Option: B
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.

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

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

  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

Show answer
Correct Option: B
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 )

Lateral roots in dicots are endogenous in origin and they are formed by:-

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

  1. A tissue which give rise to root cap

  2. A tissue which gives rise to cork cambium

  3. A tissue which also works as water checkdam

  4. A tissue which forms the primary vascular bundles

Show answer
Correct Option: A