major feature
1. Algae is a primitive and ancient lower organism. Algae have simple structure, no differentiation of roots, stems and leaves, and most of them are single cells, colonies or multicellular phyllodes. For example, Chlorella is a single cell, Volvariella volvacea belongs to a group, and kelp is a thallus.
2. Algae contain photosynthetic pigments such as chlorophyll, which can carry out photosynthesis and belong to autotrophs.
3. Algae, including different groups of organisms that can generate energy through photosynthesis. Although other algae seem to obtain photosynthetic capacity from cyanobacteria, they have independent branches in evolution. There are about 30 thousand species of algae known to mankind.
4. The difference between algae and bacteria and protozoa is that the way algae produce energy is photosynthetic autonomy. The study of algae is called phycology. In the old classification system, algae were once classified as plants, but with the development of taxonomy, algae have a new attribution. Therefore, "algae" is a common name, which is mistaken for plants because of its individual morphology and lifestyle.
5. Algae do not belong to the plant kingdom, but belong to the protozoan kingdom. Algae are artificially divided into complex groups, including both eukaryotes and prokaryotes (such as cyanobacteria). Algae can be roughly divided into phylum 10, and different classification systems will be slightly different.
The common characteristics of algae and ferns are as follows
A. the roots and leaves are not differentiated.
B. Living in water
C. Seed production
D. spore production
Answer: D. Solution: There are many kinds of algae plants, most of which live in water and a few in wet places. Some are unicellular, such as Chlamydomonas, and some are multicellular, such as kelp and laver. They are simple in structure, have no differentiation of roots, stems and leaves, and cannot produce seeds. They are spore plants. Ferns are multicellular. With the differentiation of roots, stems and leaves, there are conductive tissues in the body, which are generally higher. Pteridophytes do not bear seeds and also belong to spore plants. Pteridophytes can't reproduce without water, so they are suitable for living in wet places. It can be seen that D meets the meaning of the question.