Tag: botany

Questions Related to botany

The row of smaller leaves lying in the mid-ventral line of members of Acrogenous Jungermanniales are termed as _____________.

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Amphigastria

  2. Amphithecium

  3. Amphigenous

  4. Amphigynous

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Correct Option: A

State whether the following statements are true or false.
Monocots have parallel venation in their leaves, while dicots have netted venation.

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
Answer A: True
Monocots leaf veins are arranged in parallel venation and dicot leaf veins are arranged in reticulate or netted venation.

Which of the following kinds of venation is present in banana?

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Reticulate unicostate

  2. Reticulate multicostate

  3. parallel unicostate

  4. parallel multicostate

Show answer
Correct Option: C
Explanation:

Pinnate or unicostate parallel venation: In such venation, lamina has a single prominent vein or midrib extending from the base to the apex of the lamina, e.g., Banana etc.

So the correct answer is 'parallel unicostate'.

Anisophylly can be traced in

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Trapa

  2. Ranunculus

  3. Strobilanthes 

  4. All of the above

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Correct Option: C
Explanation:

Anisophylly is term commonly referred to explain plant having pairs of leaves with the significant difference in their size between two leaves. Goldfussia (Strobilanthes anisophyllus) is an evergreen shrub. It has glossy, dark green leaves of unequal size, which are stained blackish purple on both sides. Mauve flowers appear in spring and intermittently throughout the year. Thus, anisophylly is observed in Strobilanthes.

A dicot leaf having parallel venation is

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Eryngium

  2. Zizyphus

  3. Ricinus

  4. Cassia

Show answer
Correct Option: A
Explanation:

The phenomenon of arrangement of veins on the leaf is called as venation. There are two types venation, namely reticulate venation and parallel venation. Reticulate venation involves irregular distribution of veins to form a network. Examples of plants showing reticulate venation include rose, tulsi, Hibiscus, papaya, Ficus, Bambusa. Parallel venation involves the veins running parallel to each other. Examples of plants showing parallel venation include grains, banana, canna, grass, musa, plum, Zea (maize). Leaves of monocot plants show parallel venation and leaves of dicot plants show reticulated venation. However, there are exceptions in dicots  like Corymbium, Calophyllum, Eryngium. They show parallel venation. 

Thus, the correct answer is 'Eryngium.'

Reticulate venation is a characteristic of dicots. An exception to this generalisation?

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Calophyllum

  2. Ficus

  3. Hibiscus

  4. Zizyphus

Show answer
Correct Option: A
Explanation:

Reticulate venation is a characteristic of dicots while parallel venation is of monocots. But there are some exceptions as some dicot plants show parallel venation, e.g., Calophyllum, Corymbium, etc., and reticulate venation is also shown by some monocot plant e.g., Alocasia, Smilax, etc.

So,the correct answer is " Calophyllum ".

Parallel venation is observed mostly in

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Monocot plants

  2. Dicot plants

  3. Thallophytes

  4. Bryophytes

Show answer
Correct Option: A
Explanation:
Venation is the arrangement of veins in a leaf. Parallel venation is where the secondary veins run parallel to each other and are connected laterally by minute and straight veinlets. This type of venation is mostly seen in monocots, for example, grass. 
So, the correct answer is 'Monocot plants'

In a leaf with reticulate venation

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Veins forms a network on the leaf

  2. Veins run parallel to the midrib

  3. Veins run horizontal to the midrib

  4. Veins criss-cross each other in an irregular pattern

Show answer
Correct Option: A
Explanation:

Venation is the arrangement of veins in a leaf. In reticulated venation, veins are interconnected and form a web-like network. There is a prominent vein called the midrib from which many small veins arise which finally form a net like structure in the lamina. This kind of venation is seen in dicots.

In a leaf with parallel venation

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Veins form a network on the leaf

  2. Veins run parallel to the midrib

  3. Veins run horizontal to the midrib

  4. Veins crisscross each other to from an irregular pattern

Show answer
Correct Option: B
Explanation:

Venation is the arrangement of veins in a leaf. Parallel venation is where the secondary veins run parallel to each other and are connected laterally by minute and straight veinlets. This type of venation is mostly seen in monocots.

Parallel venation is a characteristic of moncots. which of the following is an exception to this generalization?

botany leaf - external morphology venation arrangement of leaves morphology of leaf

  1. Smilax

  2. Colocasia

  3. Alocasia

  4. All of these

Show answer
Correct Option: D
Explanation:

In case of parallel venation, the veins run parallel to each other and network is not formed. This type of venation is the characteristic feature of monocots. There are few exceptions, e.g., Smilax, Colocasia, Alocasia, Dioscorea, etc.
Correct option is D.