Match the following types of algae with their characteristics. 1. green algae releases toxins that can kill marine life 2. golden brown algae unicellular algae; also called diatoms 3. fire algae to form coral reefs 4. brown algae responsible for main oxygen supply for the atmosphere 5. red algae seaweed and kelp

The right matches are:

1. Green algae ==> responsible for main oxygen supply for the atmosphere

Green algae are a group of algae whose main photosynthetic pigments are chlorophylls a and b. As their name suggests, green algae are usually green in color.

They include a variety of organisms ranging in size from a few micrometers to more than one meter in size and with many different aspects.

2. Golden brown algae ==>uni-cellular algae called diatoms.

Diatoms constitute the bulk of marine phytoplankton. Its cell consists of two siliceous valves imbricated one inside the other, like a box with its lid; they constitute the Frustule. The two parts are often joined by a strapping.

Each cell contains a nucleus and cytoplasm, in which we find chlorophyll and xantophyll (and other pigments) that give respectively greenish and yellowish (golden), as well as oily corpuscles: the pyrenoids.

3. Fire algae ==>releases toxins that can kill marine life.

A red tide is a type of algae bloom originating from a relatively rapid proliferation of the concentration of these algae called fire algae, microorganisms often assimilated to microalgae and grouped in phytoplankton, in any body of water. This overgrowth usually results in a coloring of the water in red.

This phenomenon is completely natural and occurs when the temperature, the periods of sunshine and the marine currents are favorable. More than 300 species are at the origin of the red tides and at least 80 are toxic.

4. Brown algae ==> seaweed and kelp.

Pheophyceae, or brown algae, are almost exclusively marine. Because of their size and abundance, some of them play a very important role in the vegetation of the various seas. The extensive stands of Laminariales are home to a diverse fauna of edible fish and crustaceans that provide abundant food. In addition to industrial uses, it should be noted that in Japan some Laminaria are widely exploited for human consumption as kombu.

5. Red algae ==> helps to form coral reefs.

Red algae, or rhodophytes (Rhodophyta division), are a large taxon of mainly marine algae, most of them multicellular (most of them are sessile, that is to say that they develop on any substrate ).

They are characterized by a pigment composition with a single type of chlorophyll, chlorophyll a, carotenoids and characteristic pigments, phycobiliproteins.

when it is at an intermediate population density