Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

Leave grow due to presence of 

  1. Apical meristan

  2. Diffused meristem

  3. Intercalary meristem

  4. Mass meristem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The apical meristem, also known as the “growing tip,” is an undifferentiated meristematic tissue found in the buds and growing tips of roots in plants.
So the correct option is 'Apical meristem'.
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

If a leaf has more than one prominent vein it is said to be

  1. Unicostate

  2. Multicostate

  3. Pinnate

  4. Palmate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Venation in which the lamina has more than one equally prominent or principal veins is Multicostate reticulate venation
  • They give rise to lateral veins connected by reticulations of veinlets. 
  • Multicostate reticulate venation has two forms. Convergent and Divergent.
  • Hence, If a leaf has more than one prominent vein, it is  Multicostate.
  • So, the correct answer is 'Multicostate'.
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

The monocotyledons showing reticulate venation is

  1. Smilax

  2. Dioscorea

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Reticulate venation is found in dicot leaves, while in monocot. Reticulate venation is found in dicot leaves, while in monocot leaves venation is of parallel type.
  •  Monocot having reticulate venation, e.g., Smilax, Colocasia, Dioscorea.
  • Hence, The monocotyledons showing reticulate venation is Smilax and Dioscorea.
  • So, the correct answer is 'Both A and B
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

The monocotyledonous leaf shows which of the following venation?

  1. Pinnate reticulate

  2. Parallel

  3. Palmate reticulate

  4. Pinnate parallel
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Parallel venation refers to a pattern in the veins of a leaf where the secondary veins run parallel to each other off of a central, perpendicular primary vein. 
  • The best example for parallel venation is banana. Some of the monocotyledons like bajra, sorghum, maize, wheat, rice, grasses, coconut, palm and then dicots like mango also the examples of parallel venation.
  • Hence, The monocotyledonous leaf shows Parallel venation.
  • So, the correct answer is 'Parallel'.
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

Reticulate venation is observed mostly in

  1. Monocot plants

  2. Dicot plants

  3. Thallophytes

  4. Bryophytes
Reveal answer Fill a bubble to check yourself
B Correct answer
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. for example, mango.

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

Venation is the ________________.

  1. arrangement of leaves on the stem

  2. arrangement of veins on the lamina

  3. arrangement of leaves in bud.

  4. folding of leaves in bud.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Venation refers specifically to the pattern and arrangement of veins within the leaf blade, or lamina. It helps in the transport of water and nutrients and provides structural support to the leaf.

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

In plants like Nymphaea which is a submerged hydrophyte, the stomata are present on

  1. Adaxial (upper) surface of leaf

  2. Abaxial (lower) surface of leaf

  3. On both surface of leaf

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If the stomata and waxy cuticle are present on submerged leaves, they may disturb the buoyancy of the leaf. Hence, the stomata are found in the upper surface of the submerged plant. The stomata in the leaf are open majority of the time because there is no need for water conservation.

Thus, the correct answer is option A.

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

Which of the following contains reticulate venation on its leaves?

  1. Bamboo

  2. Sugarcane

  3. Mango

  4. Datepalm
Reveal answer Fill a bubble to check yourself
C Correct answer
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. for example, mango. 

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

A plant showing reticulate venation is

  1. Ficus

  2. Canna

  3. Musa

  4. Zea
Reveal answer Fill a bubble to check yourself
A Correct answer
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. Parallel venation involves the veins running parallel to each other. Examples of plants showing parallel venation include grains, banana, canna, grass, musa, Zea (maize). Leaves of monocot plants show parallel venation and leaves of dicot plants show reticulated venation.

Thus, the correct answer is 'Ficus.'

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

In Musa, the venation is

  1. Unicostate reticulate

  2. Unicostate parallel

  3. Multicostate reticulate

  4. Multicostate parallel
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Venation is the arrangement of veins on the leaves. It is basically of 2 types, reticulate and parallel. Reticulate venation involves irregular distribution of veins to form a network. Parallel venation involves the veins running parallel to each other. In pinnate or unicostate venation, the lamina has a single principal vein or midrib. It produces lateral veins. In palmate or multicostate venation, lamina has more than one principal vein. In Musa, the venation is unicostate parallel. 

Thus, the correct answer is 'Unicostate parallel.'