Tag: root - external morphology

Quizzes (4) Questions (139)

Questions Related to root - external morphology

Multiple choice botany root - external morphology root systems root system in plants forms of root

Exarch and polyarch vascular bundles occur in

  1. Monocot stem

  2. Monocot root

  3. Dicot stem

  4. Dicot root
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In monocot root, vascular bundles are radial in arrangement. There are eight bundles each of xylem and phloem. Hence, the condition is described as polyarch. Exarch and polyarch vascular bundles occur in monocot roots. Xylem and phloem elements are combined in a central strand without pith, the stele. The roots of dicot species like wood plants or perennial plants performs secondary growth, while roots of monocots cannot.
Thus, the correct answer is option B.
Multiple choice botany root - external morphology root systems root system in plants forms of root

Tall trees of what range of height have strong buttresses at their base?

  1. $15$ m and above
  2. $5-7$m
  3. $3-5$m
  4. $7-10$m
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tall trees of range 15m and above have strong buttress because they need to support the whole plant body and its top part from falling or swaying in the extreme environmental conditions.

So, the correct option is '15m and above'.

Multiple choice botany root - external morphology root systems root system in plants forms of root

In Orchis, the adventitious roots are

  1. Fasciculated tuberous

  2. Palmate

  3. Fibrous

  4. Both B and C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Palmate tuberous roots : In Orchis there is a pair of succulent tuberous root, one of which perishes every year while another new one is formed by its side. Such orchid roots may sometimes be of palmate shape, therefore, called palmate roots.

So, the correct answer is 'Palmate'.
Multiple choice botany root - external morphology root systems root system in plants forms of root

Consider the following statements regarding the root system of angioserms.
I. In monocots, the fibrous root system arises from base of stem.
II. Region of elongation is called root hair zone.
III. In sweet potato, adventitious roots get swollen and store food.
IV. Stem of Maiza and Sugarcane have supporting roots called prop roots.

  1. I and II correct, III and IV wrong

  2. II and III correct, I and IV wrong

  3. II and IV correct, I and III wrong

  4. I and III correct, II and IV wrong

  5. IV correct, I, II, and III wrong
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement I is correct (monocots have fibrous roots). Statement III is correct (sweet potato roots store food). Statement II is wrong (root hair zone is behind the elongation zone). Statement IV is wrong (prop roots are in Banyan, not Maize/Sugarcane; those are stilt roots).

Multiple choice botany root - external morphology root systems root system in plants forms of root

Which one is correctly matched?

  1. Dahlia - Fasciculated root

  2. Monstera - Fibrous roots

  3. Basil - Prop root

  4. <p>Azadirachta - Adventitious roots</p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Fasciculated roots are the type of modified adventitious root. They are tuberous root which become thick due to storage of food. They occur in clusters at the base of the stem; example Asparagus, Dahlia. In Dahlia they lie at the base of the stem while in Asparagus the fasciculated fleshy roots occur at intervals on the normal roots.

So, the correct answer is 'A'.
Multiple choice botany root - external morphology root systems root system in plants forms of root

Consider the following statements.
a. Epidermis and cortex of monocot root are similar to those of dicot root.
b. Hypodermis of dicot stem consists of sclerenchymatous cells.
c. The cells of bundle sheath in maize leaf serve as temporary storage cells.
d. The dicot leaf is hypostomatic.
Which of these statements are correct?

  1. $1$ and $2$
  2. $2, 3$ and $4$
  3. $1, 3$ and $4$
  4. $1, 2, 3$ and $4$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement a is correct (anatomy is similar). Statement b is correct (dicot stem hypodermis is collenchymatous, but some sources classify it as sclerenchymatous in specific contexts, though usually collenchyma). Wait, statement d is correct (dicot leaves are dorsiventral and hypostomatic). Given the options, 1 and 2 are the most likely intended correct pair.

Multiple choice botany root - external morphology root systems root system in plants forms of root

Primary inoculums of red rot of sugarcane comes from _______________.

  1. Mycelium in reddened pith

  2. Conidia and mycelium in buds

  3. Acervuli in the rind

  4. Conidia and mycelium in debris
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Red rot of sugarcane is caused by Colletotrichum falcatum. The primary inoculum is the mycelium that survives in the infected pith of the sugarcane stalks used for planting.

Multiple choice botany root - external morphology root systems root system in plants forms of root

Select the mismatched pair.

  1. Tap root system - Dicots

  2. Fibrous root system - Monocots

  3. Fasciculated roots - Curcuma

  4. Slit roots - Sugarcane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Fasciculated fleshy roots are modified adventitious roots, in which swollen roots or root tubers occur in clusters from lower nodes of stem, e.g. Dahlia and  . In Curcuma, nodulose roots are found where the swellings occur only near the tips.
Tap roots are present in dicots.
Fibrous root is found in monocots.
Slit root is present in sugarcane.
So, the correct answer is 'Fasciculated roots - Curcuma'
Multiple choice botany root - external morphology root systems root system in plants forms of root

Which of the following pairs are correctly by matched?
a. Assimilatory root- Photosynthesis
b. Fasciculate root - Food storage
c. Stilt root- Mechanical support
d. Sucking root- Absorption of moisture from the air
Select the correct answer.

  1. $2, 3$ and $4$
  2. $1, 2$ and $4$
  3. $1, 3$ and $4$
  4. $1, 2$ and $3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Assimilatory roots (e.g., Tinospora) perform photosynthesis. Fasciculate roots (e.g., Dahlia) store food. Stilt roots (e.g., Maize) provide mechanical support. Sucking roots (e.g., Cuscuta) are haustoria for absorption from host plants, not moisture from air (that is velamen roots).