Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

How many divisions must occur in a cell of root tip to form 128 cells ?

  1. 128

  2. 127

  3. 64

  4. 3
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice botany root - external morphology zones of the root morphology of root root system in plants

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

  1. c, b, e, a, d

  2. a, b, c, d, e

  3. d, e, a, c, b

  4. e, d, c, b, a
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct longitudinal sequence of root zones from the tip upwards is: Root cap zone (c), Zone of meristem (b), Zone of elongation (e), Root hair zone (a), and Zone of maturation (d).

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

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

  1. C, B, E, A, D

  2. A, B, C, D, E

  3. D, E, A, C, B

  4. E, D, C, B, A
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The sequence of zones in a root from the tip upwards is: Root cap (C), Meristematic zone (B), Elongation zone (E), Root hair zone (A), and Maturation zone (D).

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".