Explanation
The inflorescences with indeterminate growth of axis are found in Raceme and cyathium. Indeterminate simple inflorescences are generally called as racemose. The main kind of racemose inflorescence is the raceme and the other kind of racemose inflorescences can all be derived from this one by dilation, compression, swelling or reduction of the different axes. The cyathia are sometimes solitary, but are usually in cymes, inflorescences of the second order, in pseudumbels, on dichotomously branched stalks or in so-called simple cymes which consist of one central and two lateral cyathia.Therefore, the correct answer is option A.
Bracts that appear in a whorl subtending an inflorescence are collectively called an involucre. An involucre is a common feature beneath the inflorescences of many Apiaceae, Asteraceae, Dipsacaceae and Polygonaceae.Each flower in an inflorescence may have its own whorl of bracts, in this case called as an involucel. Many asteraceous plants have bracts at the base of each inflorescence. The term involucre is also used for a highly conspicuous bract or bract pair at the base of an inflorescence. In the family Betulaceae, the involucre is a leafy structure that protects the developing nuts. Therefore, the correct answer is option B.
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