Class 11 · Morphology of Flowering Plants

Phyllotaxy: Leaf Arrangement Patterns — NEET Biology

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📖 NCERT Source

Phyllotaxy is the pattern of arrangement of leaves on the stem or branch. This is usually of three types – alternate, opposite and whorled. In alternate type of phyllotaxy, a single leaf arises at each node in alternate manner, as in china rose, mustard and sun flower plants. In opposite type, a pair of leaves arise at each node and lie opposite to each other as in Calotropis and guava plants. If more than two leaves arise at a node and form a whorl, it is called whorled, as in Alstonia.

📐See NCERT Figure 5.6 for the diagram.
NCERT Biology · Class 11 · Chapter 5 · Paragraph 19
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QuestionPractice Question

Match the following plants with their type of phyllotaxy: Column I (Plant) 1. Mustard 2. Calotropis 3. Alstonia 4. China rose 5. Guava Column II (Phyllotaxy type) A. Alternate B. Opposite C. Whorled

📖 Solution & NCERT Explanation
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Correct answer: B 1–A, 2–B, 3–C, 4–A, 5–B

Mustard → Alternate phyllotaxy. Calotropis → Opposite phyllotaxy. Alstonia → Whorled phyllotaxy. China rose → Alternate phyllotaxy. Guava → Opposite phyllotaxy. Thus, the correct matching is 1–A, 2–B, 3–C, 4–A, 5–B, which corresponds to Option b.

❓ Frequently Asked Questions
What does NCERT say about Phyllotaxy pattern arrangement leaves?
Phyllotaxy is the pattern of arrangement of leaves on the stem or branch. This is usually of three types – alternate, opposite and whorled.
Has this concept appeared in NEET?
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Which chapter is this from?
Morphology of Flowering Plants, Class 11 NCERT Biology.

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