How to look at the benefits and disadvantages of algae plants, are algae plants?

Pros: Algae fix inorganic carbon through photosynthesis and convert it into carbohydrates, thus providing the basis for water productivity. The total productivity of marine planktonic algae is estimated at 31 109 tonnes of carbon per year.

As one kilogram of fish meat takes about 100 1000 kilograms of planktonic algae in the transition of the food chain, the production of planktonic algae is an indicator of marine productivity in areas rich in planktonic algae that are home to world-famous fishing grounds.

In pond fish farming, water quality is generally judged by water color, which is determined by the dominant species of algae and their degree of reproduction. For example, when the dominant species of Hemogomycetis is dominant, it shows a red bloom, indicating that the water quality is poor. When Chlamydomonas is dominant, it has dark green blooms and sticky blisters, indicating that the water quality is fertile; When microcysts, trembling algae and anaanavues are dominant, the pool water is a patina-colored gauze flocculent bloom, and the smell is harmful to fish; The blue bloom formed by the dominance of blue dinoflagellates is one of the typical water quality of high-yield fish ponds for cultured silver carp, bighead carp, carp, crucian carp and non-crucian carp, but overbreeding will also deteriorate the water quality and cause fish flooding. In addition, single-celled algae such as flat algae, Dunaliella algae and chlorella have high protein content, which is an important natural bait for shellfish, shrimp and sea cucumber farming.

Nitrogen-fixing cyanobacteria are important organisms that provide chemical nitrogen on the earth, and they are also an important biological nitrogen fertilizer resource that can be used. At present, there are more than 120 species of nitrogen-fixing cyanobacteria, and the nitrogen fixation amount per hectare of paddy fields is 16 89 kg.

Kelp and wakame from the phylum Brown Algae, nori from the Red Phylum, Fat cabbage from the Cyanobacteria phylum, and Ulva and Ulva from the Chlorella phylum are all important edible algae.

The industrial use of algae is mainly to provide various algins. In addition to being edible, kelp, kelp, wakame, staghorn and hijiki from the phylum Brown Algae can be used as raw materials for iodine, mannitol and algin. Macroalgae, algae and other sargassums can also be used as raw materials for the extraction of alginate.

Alginate is widely used in the food, paper, chemical, and textile industries. Agar can be extracted from cauliflower, gaffle, fairy and so on as a raw material for medicine and chemical industry and as a culture agent for microbiological research. Carrageenan, which has a wide range of uses in the food industry, can be extracted from algae such as Horn Purpura, Cinnamomum chinensis, Cedarus algae, Sand cabbage, Ginkgo biloba, Fork algae, Centipede algae, sea leach, and Igu grass.

Cons: Algae blooms. They cannot photosynthesize at night, but they do respire. The respiration of a large number of algae will greatly reduce the oxygen content in the water, causing the organisms in the water to suffocate to death.

If algae plants are used well, it will be of great benefit to us, for example, some algae can be used to absorb harmful gases in the air that exceed the standard, and absorb carbon dioxide can reduce the greenhouse effect; Some algae can also be used to produce fuel. Making good use of algae is very helpful in our lives. But if it is not well controlled, it will cause pollution, and polluted rivers will cause damage to our lives.

Algae are not plants. All algae lack true roots, stems, leaves, and other tissues that can be found on higher plants. Algae differ from bacteria and protozoa in that the way algae produce energy is photosynthetic autonomism.

The study of algae is called phycology, and in the old classification system, algae were classified as plants, but with the development of taxonomy, algae have a new category.

Algae may be composed of one or a few cells, or many cells may aggregate into a tissue-like structure. Filaments can branch or not, and some algae are unicellular, while others aggregate into colonies.

The green algae of the genus Pine algae are formed by the interweaving of numerous branched filaments, and the morphology and function of the filaments are different in different parts. Although predominantly aquatic, algae are ubiquitous, ranging from temperate forests to polar plains. Some varieties live in soil and can tolerate long-term water scarcity; Others live in the snow; A few species thrive in hot springs.

Some algae, like other eukaryotes, have a nucleus, membrane vacuoles and organelles (e.g., mitochondria), and most algae need oxygen for life. Photosynthesis is carried out with various chloroplast molecules such as chlorophyll, carotenoids, phycobiliproteins, etc. 90% of the Earth's photosynthesis is carried out by algae, which are believed to have played an important role in creating oxygen-rich environments in the early history of the planet.

Planktonic algae are a very important link in the marine food chain, and the survival of all higher aquatic organisms ultimately depends on the presence of algae, in addition, algae have been used as feed for livestock and food for humans since prehistoric times.

Algae plants. Key features:

There are unicellular and multicellular, simple structure, no differentiation of roots, stems and leaves;

The whole body absorbs water and inorganic salts from the environment, and there are chloroplasts in the cells that can carry out photosynthesis.

Typical representatives: Freshwater algae: Chlamydomonas (unicellular algae), sponge (multicellular algae, green filamentous);

Marine algae: seaweed, kelp.

It can be used as bait for fish;

It can be eaten, such as kelp, seaweed;

It can be used medicinally, such as algin, agar, etc., extracted from algae.

Mode of reproduction: It can produce spores and reproduce offspring by spores, that is, spore reproduction, and the reproductive process is inseparable from water.

Bryophytes. Key features:

Generally, it has stems and leaves, there are no ducts in the stems, and there are no veins in the leaves, so there is no conduction tissue;

There are no real roots, only short, thin false roots. It is sessile, so the plants are usually short;

Leaves have only one layer of cells, containing chloroplasts, which can carry out photosynthesis and can also absorb water and inorganic salts;

The fertilization process is inseparable from water.

Typical representatives: There are about 20,000 species of bryophytes on the earth, and there are more than 2,800 kinds of bryophytes in China.

Function: Pioneers of nature, many bryophytes can secrete a liquid, which slowly dissolves into the surface of the rock, accelerates the weathering of the rock, and promotes the formation of soil, so bryophytes are also the pioneers of the growth of other plants;

promote the terrestrial use of marshes;

Because the leaves are composed of only one layer of cells, toxic gases are easy to invade, which can be used as an indicator plant to monitor the degree of air pollution.

Conserve soil and water. Mode of reproduction: It can produce spores and reproduce offspring by spores, that is, spore reproduction, and the reproductive process is inseparable from water.

Fern. Key features:

It has real roots, stems, leaves, conduction tissues and mechanical tissues, and the plants are relatively tall;

There are many sporangia on the back of the leaf, and there are a large number of spores in the sporangia;

The fertilization process is inseparable from water.

Typical representatives: there are about 12,000 species of ferns on the earth, and about 2,600 species in China, including Manjianghong (aquatic fern), kidney fern, clemat fern, and Guanzhong.

Purpose: Ancient ferns formed coal;

The young leaves of the fern are delicious wild vegetables, and they are known as the "king of mountain treasures".

Manjianghong can be used as green manure and feed, and Guanzhong, curly cypress and so on can be used for medicinal purposes;

Kidney ferns, miscanthus and nest ferns are available for ornamental purposes.

Mode of reproduction: It can produce spores and reproduce offspring by spores, that is, spores to reproduce, and the reproductive process is inseparable from water.