Tag: stem - external morphology

Questions Related to stem - external morphology

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

Show answer
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

Show answer
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

Show answer
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)

Show answer
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

Show answer
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

Show answer
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

Show answer
Correct Option: C

Choose the correct answers from the alternatives given.
Annual rings are the number of

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

  1. Rings of vascular bundles in a monocot stem

  2. Layers of secondary xylem in a stem

  3. Internodes in a stem

  4. Both (b) and (c)

Show answer
Correct Option: B
Explanation:

Each year, the tree forms new cells, arranged in concentric circles called annual rings or annual growth rings. These annual rings show the amount of wood produced during one growing season. As the stem grows, complete ring called the cambial ring is formed. Cambial ring leads to the formation of secondary xylem and secondary phloem. 

Hence, the correct answer is 'Layers of secondary xylem in a stem'.

Choose the correct answers from the alternatives given.
During the secondary growth in the dicotyledonous stems the cork cambium gives rise to

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

  1. Secondary xylem and secondary phloem

  2. Secondary cortex and cork

  3. Pith and medullary rays

  4. Multicellular hairs

Show answer
Correct Option: B
Explanation:

Cork cambium is a tissue found in many vascular plants as part of the epidermis. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems. It gives rise to cork outside and secondary cortex inside. 

Hence, the correct answer is 'Secondary cortex and cork'.