Class 11 Exam > Class 11 Questions > The leaves of Cycas are :a)Unipinnately compo...
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The leaves of Cycas are :
- a)Unipinnately compound with parallel venation
- b)Unipinnately compounds with unicostate reticulate venation
- c)Unipinnately compounds with multicostate reticulate venation
- d)Unipinnately compounds with no venation
Correct answer is option 'D'. Can you explain this answer?
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The leaves of Cycas are :a)Unipinnately compound with parallel venatio...
There are two types of leaves - foliage leaves and scaly leaves. The foliage leaves are pinnate (or more rarely bipinnate) and arranged spirally, with thick and hard keratinose. They are not permanent and fall off leaving back leaf-bases. The leaflets are articulated, have midrib but lack secondary veins.
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The leaves of Cycas are :a)Unipinnately compound with parallel venatio...
The correct answer is option 'D': Unipinnately compounds with no venation.
Explanation:
Cycas is a genus of gymnosperms belonging to the family Cycadaceae. The leaves of Cycas are unipinnately compound, which means they are divided into leaflets on either side of the central axis. However, unlike most plants, Cycas leaves do not exhibit any visible venation or vascular patterns.
Unipinnately compound:
- Unipinnately compound leaves are those in which the leaflets are arranged in a single row along the central axis.
- In Cycas, the leaflets are arranged in a single row on either side of the central axis, giving the appearance of a feather-like structure.
No venation:
- Venation refers to the arrangement of veins or vascular tissues in the leaves of plants.
- Most plants exhibit some form of venation, such as parallel venation, reticulate venation, or palmate venation.
- Parallel venation is characterized by veins running parallel to each other, such as in grasses and monocots.
- Reticulate venation is characterized by a network of veins forming a complex pattern, such as in dicots.
- Palmate venation is characterized by veins radiating outwards from a central point, resembling the fingers of a hand.
- However, in the case of Cycas, the leaves do not show any visible venation. The leaflets are simple and do not contain any visible veins or vascular tissues.
In conclusion, the leaves of Cycas are unipinnately compound, with leaflets arranged in a single row on either side of the central axis. However, they do not exhibit any visible venation or vascular patterns, which is why the correct answer is option 'D': Unipinnately compounds with no venation.
Explanation:
Cycas is a genus of gymnosperms belonging to the family Cycadaceae. The leaves of Cycas are unipinnately compound, which means they are divided into leaflets on either side of the central axis. However, unlike most plants, Cycas leaves do not exhibit any visible venation or vascular patterns.
Unipinnately compound:
- Unipinnately compound leaves are those in which the leaflets are arranged in a single row along the central axis.
- In Cycas, the leaflets are arranged in a single row on either side of the central axis, giving the appearance of a feather-like structure.
No venation:
- Venation refers to the arrangement of veins or vascular tissues in the leaves of plants.
- Most plants exhibit some form of venation, such as parallel venation, reticulate venation, or palmate venation.
- Parallel venation is characterized by veins running parallel to each other, such as in grasses and monocots.
- Reticulate venation is characterized by a network of veins forming a complex pattern, such as in dicots.
- Palmate venation is characterized by veins radiating outwards from a central point, resembling the fingers of a hand.
- However, in the case of Cycas, the leaves do not show any visible venation. The leaflets are simple and do not contain any visible veins or vascular tissues.
In conclusion, the leaves of Cycas are unipinnately compound, with leaflets arranged in a single row on either side of the central axis. However, they do not exhibit any visible venation or vascular patterns, which is why the correct answer is option 'D': Unipinnately compounds with no venation.
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The leaves of Cycas are :a)Unipinnately compound with parallel venationb)Unipinnately compounds with unicostate reticulate venationc)Unipinnately compounds with multicostate reticulate venationd)Unipinnately compounds with no venationCorrect answer is option 'D'. Can you explain this answer?
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