What are the characteristic features of euglenoids how are they more advanced than blue green algae?
Answers
Some characteristic features of Euglenoids are as follows.
• Euglenoids (such as Euglena) are unicellular protists commonly found in fresh water.
• Instead of cell wall, a protein-rich cell membrane known as pellicle is present.
• They bear two flagella on the anterior end of the body.
• A small light sensitive eye spot is present.
• They contain photosynthetic pigments such as chlorophyll and can thus prepare their own food. However, in absence of light, they behave similar to heterotrophs by capturing other small aquatic organisms.
• They have both plant and animal-like features, which makes them difficult to classify and hence they are called as connecting link between plants and animals.
Euglenoid:- In earlier time due to photosynthetic capability of euglenoids they were kept in the plant kingdom. But as they do not have cell wall then some scientists placed them in animal kingdom. But presently they are placed in Protista as according to five kingdom of classification.
Examples:- Phacus, Eutreptia, Peranema etc.
They are more developed than blue green algae because of the following reasons:-
(1) Euglenoids are surrounded by a cell membrane and that cell membrane is made up of lipoprotein.
(2) They also help in photosynthesis process as they have chloroplasts. And that chloroplast may contain Chlorophyll A, Chlorophyll B or Xanthophyll.
Some points related with euglenoids are as follows:-
- They are unicellular.
- They do not have cell wall.
- They are found in ponds , fresh water lakes etc.
- They may be also present in damp soil.
- Generally mixotrophic type of nutrition is found in them.
- They are free living organisms.
- Contractile vacuole is present in them which helps them in osmoregulation.
- Reproduction is by binary fission, more specific it is longitudinal binary fission.
- They behave like hetertrophs.
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