Tag: morphology of leaf

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Questions Related to morphology of 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.'

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

A monocot showing reticulate venation is

  1. <p>Zea</p>

  2. <p>Plum</p>

  3. <p>Bambusa</p>

  4. <p>Smilax</p>
Reveal answer Fill a bubble to check yourself
D 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, 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 monocots like Smilax and Colocasia. They show reticulate venation. Thus, the correct answer is 'Smilax.'

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

Parallel venation is found in

  1. <p>Mentha</p>

  2. Banana

  3. <p>Dalbergia</p>

  4. <p>Syzygium</p>
Reveal answer Fill a bubble to check yourself
B 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 'Banana.'

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

Assertion : Floral initiation is done by florigen.

Reason : Florigen is translocated from flowers to leaves.

  1. If both the assertion and reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reaon is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cajlakhjan, working on floral initiation, coined the term florigen for the flowering hormone thought to be present in photoinduced leaves and plants. It is supposed that leaf prepare a special compound A on receiving $CO _{2}$. A on turn produces B in dark and is followed by formation of C (florigen). The florigen translocated from vegetative meristems to floral initiation.

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

In the leaves, veins are useful for

  1. Transport of water and minerals

  2. Mechanical support

  3. Transport of organic nutrients

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Veins in leaves are made up of xylem and phloem. It is useful in providing mechanical support to the leaf. It also helps in transport of both water and minerals via xylem tissue and transport of organic nutrients via phloem tissue to the rest of the plant.

Thus, the correct answer is 'All of the above.'

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

Venation is monocots in

  1. Pinnate reticulate

  2. Palmate reticulate

  3. Pinnate parallel

  4. Parallel
Reveal answer Fill a bubble to check yourself
D 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. Leaves of monocot plants generally show parallel venation and leaves of dicot plants generally show reticulate venation.

Thus, the correct answer is 'Parallel.'

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

Parallel venation occurs in dicot

  1. <p>Corymbium</p>

  2. <p>Ageratum</p>

  3. <p>Carthamus</p>

  4. <p>Centipeda</p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Parallel venation means the veins present within the leaves are arranged parallel to each other. These veins never join any other veins. No branching is seen in parallel venation. All the monocots are parallelly venated whereas the dicots have reticulate venation except Corymbium and Calophyllum which are parallelly venated. So, the correct answer is 'Corymbium'.