The type of inflorescence in which flowers are borne on a flattened receptacle, as in sunflower, is:
A. Umbel
B. Capitulum
C. Spike
D. Raceme
Answer: Option B
Solution (By JKExamLibrary)
Capitulum (head) is characteristic of the Asteraceae family, where numerous small florets are arranged on a flattened disc. Raceme has flowers on pedicels along an elongated axis, spike sessile, umbel umbrella-like. Sunflower inflorescence is a capitulum.
Explanation:
Sclerenchyma provides strength, with thick lignified walls; cells are usually dead at maturity. Xylem transports water, phloem transports food, collenchyma is living with uneven thickening.
Explanation:
The fluid mosaic model (Singer-Nicolson) depicts the cell membrane as a phospholipid bilayer with embedded proteins, carbohydrates, and cholesterol, giving it fluidity.
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