Here’s a detailed solution to your GATE Life Sciences question on floral aestivation types, followed by an SEO-optimized article tailored for your interests in biology exam prep and content creation.

Question Solution

Q52. In the arrangement of floral parts in a bud, identify the INCORRECT statement.

This question tests aestivation (arrangement of floral parts like sepals/petals in a bud) and related floral terms from plant morphology (common in GATE Life Sciences syllabus under Plant Anatomy/Systematics).

Option Analysis:

(A) Valvate: where the petals or sepals do not overlap but simply touch one another by their margins
Correct. Valvate aestivation means margins touch without overlapping (e.g., sepals in Brassica). Like pages of a book pressed edge-to-edge.

(B) Scabrous: petals rough and harsh to touch
Correct. Scabrous describes texture (rough, scaly surface) of petals/sepals, not aestivation arrangement (e.g., some Malvaceae petals). It’s a morphological trait, not bud positioning.

(C) Epicalyx: an extra calyx found in some flowers outside the calyx
Correct. Epicalyx is an additional whorl of green, sepal-like bracts outside the true calyx (e.g., Hibiscus, Malvaceae). Protects bud; involucre-like.

(D) Imbricate: where sepals and petals overlap each other at the margin
INCORRECT. Imbricate aestivation involves one-sided overlapping of sepals/petals (like roof tiles; margins overlap variably, e.g., descending in Cassia, ascending in Gulmohar). It doesn’t specify “sepals and petals overlap each other”—imbricate applies separately to calyx (sepals) or corolla (petals), not mixed overlapping between them. Vague phrasing makes it wrong.

Answer: (D)
Key GATE tip: Memorize aestivation types—valvate (touch), twisted (one margin inside all), imbricate (roof-tile overlap), vexillary (papilionaceous).

Boost your GATE Life Sciences prep with this breakdown of floral aestivation types in buds. If you’re tackling plant morphology questions like “arrangement of floral parts in a bud,” understanding valvate, imbricate, and epicalyx is crucial for scoring in Botany sections.

What Are Floral Aestivation Types?

Floral aestivation refers to how sepals (calyx) and petals (corolla) arrange and overlap inside a flower bud before opening. It’s a key topic in angiosperm morphology, tested in competitive exams like GATE XL (Life Sciences).

Common types include:

• Valvate: Margins touch, no overlap (e.g., mustard family).

• Twisted/Contorted: One petal margin tucks under the next (e.g., cotton, hibiscus).

• Imbricate: Irregular, tile-like overlapping (youngest petal overlaps others).

• Vexillary: Specific to pea family (largest petal posterior, others tucked).

Detailed Explanation of Each Option

Let’s dissect the question options for clarity:

(A) Valvate Aestivation

Sepals or petals meet edge-to-edge without overlapping—like a closed zip. Seen in Brassica (calyx) and Asparagus. Correct statement.

(B) Scabrous Petals

Describes texture (rough, harsh feel), not aestivation pattern. Common in some wildflowers for defense against herbivores. Correct, but unrelated to bud arrangement.

(C) Epicalyx

Extra whorl of bracts resembling sepals, outside the true calyx. Protects inner parts; prominent in Hibiscus rosa-sinensis (china rose). Correct.

(D) Imbricate Aestivation – The Incorrect One

Imbricate means overlapping like shingles, but only within calyx (sepals among themselves) or corolla (petals among themselves). Examples: Descending imbricate (Cassia), quincuncial (Ranunculus). It doesn’t mean “sepals and petals overlap each other.” Incorrect statement.

GATE Life Sciences Exam Tip

Focus on diagrams: Sketch aestivations—valvate (flat touch), imbricate (roof tiles). Practice PYQs from 2015–2025 for patterns.

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