Question

500 worda on algae. its classification and characteristics

Answer 1

ALGAE-

GENERAL CHARACTERSTICS

Algae are the simplest multicellular plants. Some are unicellular eg. Chlamydomonas

Pant body: known as Thallus and they are avascular

Habitat: Algae are usually aquatic, either freshwater or marine and some are terresterial.

Algae are eukaryotic thallophytes.

Algae are photoautotrophs.

Storage form of food: Starch

Reproduction: Algae reproduce either by vegetative, asexual or sexual method

Vevetative method: fragmentation, hormogonia

Asexual spore: zoospores, aplanospores, hypnospores, akinetes, azygospore

Sexual method:  isogamous, anisogamous, and oogamous gametic fusion

Answer 2

◇heyya friend ...!!!◇

⬇️HERE IS YOUR ANSWER⬇️
_______________________

algae is an informal term for a large, diverse group of photosynthetic organismsthat are not necessarily closely related, and is thus polyphyletic. Included organisms range from unicellular microalgaegenera, such as Chlorellaand the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to 50 m in length. Most are aquatic and autotrophic and lack many of the distinct cell and tissue types, such as stomata, xylem, and phloem, which are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae which includes, for example, Spirogyra and the stoneworts.

No definition of algae is generally accepted. One definition is that algae "have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells". Some authors exclude all prokaryotes and thus do not consider cyanobacteria(blue-green algae) as algae.

Algae constitute a polyphyletic group since they do not include a common ancestor, and although their plastids seem to have a single origin, from cyanobacteria, they were acquired in different ways. Green algae are examples of algae that have primary chloroplasts derived from endosymbioticcyanobacteria. Diatoms and brown algae are examples of algae with secondary chloroplasts derived from an endosymbiotic red alga.

Algae lack the various structures that characterize land plants, such as the phyllids (leaf-like structures) of bryophytes, rhizoids in nonvascular plants, and the roots, leaves, and other organs found in tracheophytes (vascular plants). Most are phototrophic, although some are mixotrophic, deriving energy both from photosynthesis and uptake of organic carbon either by osmotrophy, myzotrophy, or phagotrophy. Some unicellular species of green algae, many golden algae, euglenids, dinoflagellates, and other algae have become heterotrophs (also called colorless or apochlorotic algae), sometimes parasitic, relying entirely on external energy sources and have limited or no photosynthetic apparatus. Some other heterotrophic organisms, such as the apicomplexans, are also derived from cells whose ancestors possessed plastids, but are not traditionally considered as algae

CLASSIFICATION
Division-level classification, as with kingdom-level classification, is tenuous for algae. For example, some phycologists place the classes Bacillariophyceae, Phaeophyceae, and Xanthophyceae in the divisionChromophyta, whereas others place each class in separate divisions: Bacillariophyta, Phaeophyta, and Xanthophyta.

CHARACTERISTICS
Algae are eukaryotic organisms that have no roots, stems, or leaves but do have chlorophyll and other pigments for carrying out photosynthesis. ...Unicellular algae occur most frequently in water, especially in plankton.

HOPE THIS HELPS
MARK AS BRAINLIEST IF YOU ARE SATISFIED ✌✌

__________××××××××××___________