Differentiate between.
Spike and catkin.

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Solution

In both spike and catkin inflorescences, the main axis is elongated. But in spike the flowers are bisexual, whereas in catkin, they are unisexual and apetalous.

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differentiate between

(a) Bract and bracteole (b) Pulvinus and petiole

(e) Stamen and staminoid (f) Pollen and pollenium

	List I		List II
A	Spike	1	Modified scorpiod cyme
B	Catkin	2	Sessile racemose
C	Hypanthodium	3	Branched racemose
D	Panicle	4	Inflorescence with three types of flowers
E	Rhipidium	5	Cylindrical flower structure

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