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a
Corolla is composed of petals.
b
Corolla may be tubular, bell-shaped, funnel-shaped or wheel-shaped.
c
Polypetalous condition is observed in all members of Brassicaceae family.
d
Petals are usually green in colour at early stages and protect the flower in the bud condition.
answer is D.
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Detailed Solution
Corolla is composed of petals. Petals are usually brightly coloured to attract insects for pollination. Sepals are green, leaf like and protect the flower in the bud stage.