Cycas has two cotyledons but not included in angiosperms because of
Correct answer: A. Naked ovules
- A. Naked ovules
- B. Seems like monocot
- C. Circinate ptyxis
- D. Compound leaves.
Explanation
a. Cycas is not included in angiosperms primarily due to "naked ovules." Angiosperms, or flowering plants, are characterized by enclosed ovules within an ovary, which eventually develop into fruits after fertilization. In contrast, Cycas, like other gymnosperms, has naked ovules, meaning that the ovules are not enclosed in an ovary and are typically exposed on the surface of cone scales. This is one of the key differences between angiosperms and gymnosperms. The other options, such as "seems like monocot," "circinate ptyxis," and "compound leaves," are not the primary reasons for the exclusion of Cycas from angiosperms. Naked ovules are the key feature distinguishing gymnosperms, including Cycas, from angiosperms. Other options are explained below: b. Seems like monocot: Cycas, like many gymnosperms, may appear superficially similar to monocots, which are a type of angiosperm. However, the overall reproductive structures and life cycle are different between these groups. c. Circinate ptyxis: Cycas exhibits circinate ptyxis, a type of leaf development where the young leaves are tightly coiled in a circinal manner. This is a characteristic feature of many gymnosperms, including Cycas. d. Compound leaves: Cycas typically has compound leaves, which means the leaf is divided into multiple leaflets. While some angiosperms also have compound leaves, this feature alone is not sufficient to include Cycas among angiosperms.
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About Kingdom Plantae
Plants are multicellular, photosynthetic eukaryotes with cellulose cell walls, chloroplasts and large vacuoles. Coverage includes alternation of generations, vascular and non-vascular plants, seedless and seed-producing groups, gymnosperms and angiosperms, and the distinction between monocot and dicot features.
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