. What is a leaf?• 2. Name three external morphological features of a dicotyledonous leaf• 3. State three external morphological features of a monocotyledonous leaf• 4. Describe the three different types of leaf arrangement in flowering plants• 5. Explain the following terms of a leaf apex: acute, acuminate, obtuse,emarginate and mucronate• 6. Differentiate between venation and vein in flowering plants• 7. Name five different types of leaf shapes in flowering plants• 8. Name three different types of pinnate compound leaves in flowering plants• 9. What is a compound leaf?
Question
. What is a leaf?• 2. Name three external morphological features of a dicotyledonous leaf• 3. State three external morphological features of a monocotyledonous leaf• 4. Describe the three different types of leaf arrangement in flowering plants• 5. Explain the following terms of a leaf apex: acute, acuminate, obtuse,emarginate and mucronate• 6. Differentiate between venation and vein in flowering plants• 7. Name five different types of leaf shapes in flowering plants• 8. Name three different types of pinnate compound leaves in flowering plants• 9. What is a compound leaf?
Solution
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A leaf is a plant organ that is flat, thin and usually green in color. It is attached to the stem of the plant and is primarily responsible for photosynthesis as it absorbs sunlight and uses it to convert carbon dioxide and water into glucose.
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Three external morphological features of a dicotyledonous leaf are:
- They usually have a broad, flat surface area.
- The veins in the leaf are reticulate (net-like).
- The leaf is usually petiolate, meaning it has a stalk (petiole) that attaches it to the stem.
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Three external morphological features of a monocotyledonous leaf are:
- They are usually long and narrow.
- The veins in the leaf are parallel.
- The leaf is usually sessile, meaning it does not have a petiole and attaches directly to the stem.
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The three different types of leaf arrangement in flowering plants are:
- Alternate: There is one leaf per node, and they alternate sides along the stem.
- Opposite: There are two leaves per node, and they are situated opposite each other along the stem.
- Whorled: There are three or more leaves per node, and they are arranged in a circle around the stem.
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The terms of a leaf apex are:
- Acute: The leaf ends in a sharp point with a straight or convex margin.
- Acuminate: The leaf ends in a sharp, elongated point.
- Obtuse: The leaf has a blunt or rounded end.
- Emarginate: The leaf has a shallow notch at the end.
- Mucronate: The leaf has a short, sharp tip (mucro) at the end.
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Venation refers to the pattern of veins in a leaf, while a vein is a vascular structure in the leaf that provides support and transports nutrients and water.
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Five different types of leaf shapes in flowering plants are: ovate (egg-shaped), lanceolate (lance-shaped), elliptical (oval-shaped), cordate (heart-shaped), and linear (long and narrow).
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Three different types of pinnate compound leaves in flowering plants are: unipinnate (single set of leaflets), bipinnate (leaflets are arranged on secondary veins), and tripinnate (leaflets are arranged on tertiary veins).
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A compound leaf is a type of leaf that has a fully divided blade, each part of which is known as a leaflet. Each leaflet is often mistaken for an individual leaf, but they all share a single main stem or petiole.
Similar Questions
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