which molecule is the source of the basic material used for the production of glucose in the calvin cycle

The carbon atom used to build carbohydrate molacules come from carbon dioxide, the gas that animals exhale with each breath. The Calvin cycle is the term of used for the reaction of photosynthesis that use the energy stored by the light dependent the reaction ot form glucose and other carbohydrate molacules.

answer: angiosperms

dicots

angiosperms are highly evolved plants, they produce seeds which are enclosed within in a carple. these are the largest group of plants on earth. they include trees, shrubs, herbs and small flowering plants. angiosperms exhibit a flowering stage in their life cycle. the flower serves the function of reproduction and fruit formation in majority of angiosperms. dicot is the term used to describe flowering plants that have two seed leaves. dicots are plants which develop seeds which split into two parts called cotyledons. each cotyledon contains one embryo.

here, a small purple flower development indicates that the plant belongs to angiosperms and having two embryonic leaves indicates it belongs to dicots.  

the correct answer is b