Tag: botany

Questions Related to botany

Underground stems are primarily meant for

botany stem - external morphology habit of plants plant classifications type of plants

  1. Vegetative reproduction

  2. Perennation

  3. Protection from strong light

  4. Anaerobic respiration

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Correct Option: B

In one plant, underground stems are modified to store food and in another plant, the stem tendrils develop from axillary buds to help plant climb. They are

botany stem - external morphology habit of plants plant classifications type of plants

  1. Ginger, Cucumber

  2. Carrot, Jasmine

  3. Sweet Potato, Bougainvillea

  4. Opuntia, Eichhornia

  5. Sweet Potato, Mint

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Correct Option: A

The special structures used by the climbers for climbing are

botany stem - external morphology habit of plants plant classifications type of plants

  1. Root

  2. Tendrils

  3. Stem

  4. None of the above

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Correct Option: B
Explanation:

Climbers are said to have a weak stem and cannot stand by their own so they evolve a mechanism and mostly modify either their leaves or part or leaf that helps them to climb the other plant or can attach with a wall or any other support.

So the correct option is 'Tendrils'.

Which of the following is not a creeper?

botany stem - external morphology habit of plants plant classifications type of plants

  1. Pumpkin

  2. Watermelon

  3. Sweet Potato

  4. Grapevine

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Correct Option: D
Explanation:

Creepers are weak plants that grow on ground with the help of fiber like roots that arise from the base of the stem.

ex- Pumpkin, Watermelon, and Sweet potato.
Climbers are the plant that climbs on a support by developing tendrils are modified stem that helps to bind the support.

ex-Bougainvillea and Grapevine.
So the correct option is 'Grapevine'

Which of the following plants possesses culm?

botany stem - external morphology habit of plants plant classifications type of plants

  1. Cuscuta

  2. Zingiber

  3. Bamboo

  4. Cocos

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Correct Option: C
Explanation:

Erect, unbranched stem with distinct nodes and internodes are called culm. Bamboo is a perennial evergreen stem which is characterized by a jointed stem called culm. So, the correct answer is 'Bamboo'.

Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by :

botany stem - external morphology habit of plants plant classifications type of plants

  1. Position of protoxylem

  2. absence of secondary xylem

  3. Absence of secondary phloem

  4. Presence of cortex

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Correct Option: A
Explanation:

In the dicotyledonous roots, the protoxylem is located near the periphery of the vascular cylinder. It means away from the centre (exarch condition) and the metaxylem is towards the centre. In the dicotyledonous stem, the protoxylems are located near the centre of vascular bundle means endarch condition and the metaxylem are away from the centre. So, anatomically fairly old dicotyledonous root. One can distinguish it from the dicotyledonous stem by its position of protoxylem.

So, the correct answer is 'Position of protoxylem'.

The correct option is A.

Following are the comparisons between phylloclades and cladodes (cladophylls).

Phylloclade Cladode
(i) Both main stem and branches are modified to function like leaves. Only the branches are modified to take over the function of leaves.
(ii) Phylloclade has limited or definite growth. Cladode has unlimited or indefinite growth.
(iii) It consist of several nodes and internodes.  It is usually one internode long
(iv) True leaves are commonly caducous. True leaves are either reduced to scales or modified to spines.
(v) Example: Rescus aculeatus, Asparagus etc. Example:Opuntia, Euphorbia royleana etc.

Pick up the wrong difference and select the correct option.

botany stem - external morphology habit of plants plant classifications type of plants

  1. (i) and (ii)

  2. (ii) and (v)

  3. (iii) and (v)

  4. (ii) and (iv)

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Correct Option: B

From the following, which plant has a disk-like stem?

botany stem - external morphology habit of plants plant classifications type of plants

  1. Pineapple

  2. Mango tree

  3. Banyan tree

  4. Onion

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Correct Option: D
Explanation:

A disc-like stem is found in onion. This type of stem is called the bulb. It bears fleshy scale like leaves and at the terminal end it shows the presence of terminal bud.

Hence, the correct answer is 'Onion'

One internode long runner stem of aquatic plants is called

botany stem - external morphology habit of plants plant classifications type of plants

  1. Stolon

  2. Trailer

  3. Offset

  4. None of the above

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Correct Option: C

Succulent stem occurs in

botany stem - external morphology habit of plants plant classifications type of plants

  1. Pisum

  2. Casuarina

  3. Euphorbia

  4. Oxalis

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Correct Option: C