Question:
Select the correct pair out of the following.
Select the correct pair out of the following.
Updated On: Jul 28, 2022
- Hypostomatic leaf - Dicots
- Epistomatic leaf - Monocots
- Amphistomatic leaf - Free-floating hydrophytes
- Presence of sunken stomata in leaf - Submerged hydrophytes
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The Correct Option is A
Solution and Explanation
In dicot leaves, stomata are generally present on lower epidermis (hypostomatic), whereas in monocot leaves, they are present on both the surfaces (amphistomatic). In freefloating hydrophytes, stomata are restricted to upper epidermis (epistomatic) whereas in submerged hydrophytes, stomata are either non-functional or absent. In algae and fungi, stomata are totally absent. Stomata are sunken (deep seated) in case of xerophytes.
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Top Questions on The Leaf
- Given below are two statements:
Statement I: In a dicotyledonous leaf, the adaxial epidermis generally bears more stomata than the abaxial epidermis.
Statement II: In a dicotyledonous leaf, the adaxially placed palisade parenchyma is made up of elongated cells, which are arranged vertically and parallel to each other.
In the light of the above statements, choose the correct answer from the options given below: - Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Some species of Katydids (or Bushcrickets) resembles with complete leaf or appears to be a part of leaf.
Reasons (R): Katydids show camouflage as a behavioural strategy to avoid predation.
In the light of the above Statements, choose the correct answer from the options given below: - Match List I with List II
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- Study the following statements and select the option with correct statements.
(I) Pulvinus leaf base is present in some leguminous plants.
(II) In Eichhornia the petioles expand, becomes green and synthesise food.
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- UPSEE - 2017
- Biology
- The Leaf
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Notes on The Leaf
Concepts Used:
Leaf
A primary function of the leaf is to provide nourishment for a plant. Leaves get this by extracting water from the earth and carbon dioxide from the air with the help of sunshine.
Parts of a leaf
Following are the parts of a leaf:
- The top part of the leaf is the apex or tip that can be round, pointed, and smooth.
- On most leaves, the lamina, or leaf blade, is the broadest part of the leaf.
- A petiole is a leaf that links to the plant stem.
- Stipules, which are little green addendums near the base of the petiole, can also be seen on leaves.
- Most leaves have a midrib that branches out to initiate vascular tissue veins on the sides.
- Margin refers to the leaf's outer border, which varies depending on the plant type.
- At the bottom of the blade, the base is found; it can be flat, heart-shaped, and round.