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Define chrysophytes. Why are they considered as the chief producers in the ocean?
Organisms like diatoms and desmids are called chrysophytes. They are found in both marine and freshwater and constitute the major phytoplanktons. Therefore, they are the chief producers in the ocean.
Organisms like diatoms and desmids are called
See lesschrysophytes. They are found in both marine and
freshwater and constitute the major phytoplanktons.
Therefore, they are the chief producers in the ocean.
Name three organs that assist locomotion in protists. Give an example each of protists showing these locomotions.
Locomotion in protists occurs by flagella, cilia, pseudopodia, wriggling to cells and by mucilage secretion. Flagella In euglenoids, dinoflagellates and zooflagellates. Cilia In Paramecium. Pseudopodia In Amoeba and Glime moulds.
Locomotion in protists occurs by flagella, cilia,
See lesspseudopodia, wriggling to cells and by mucilage
secretion.
Flagella In euglenoids, dinoflagellates and
zooflagellates.
Cilia In Paramecium.
Pseudopodia In Amoeba and Glime moulds.
What is the cellular nature and body organisation of members of kingdom—Protista?
Unicellular nature These are unicellular eukaryotic organisms. Some of them also form colonies. Here, the individual cells do not lose their independent identity. Body organisation Cellular differentiation is absent. Organisation is protoplasmic or acellular.
Unicellular nature These are unicellular eukaryotic
See lessorganisms. Some of them also form colonies. Here, the
individual cells do not lose their independent identity.
Body organisation Cellular differentiation is absent.
Organisation is protoplasmic or acellular.
Find out what do the terms algal blooms and red tides signify.
Algal bloom refers to the excessive growth of algae, especially cyanobacteria in polluted waters. Red tides refer to the red colour imparted to the seawater by the rapid multiplication of dinoflagellates like Gonyaulax.
Algal bloom refers to the excessive growth of algae,
See lessespecially cyanobacteria in polluted waters. Red tides
refer to the red colour imparted to the seawater by the
rapid multiplication of dinoflagellates like Gonyaulax.
Polluted water bodies have usually high abundance of plants like Nostoc and Oscillatoria. Give reasons.
Some cyanobacteria or blue-green algae like Nostoc and Oscillatoria can tolerate adverse conditions including pollutants very well, as compared to other aquatic plants. This is due to the presence of mucilage covering, resistant proteins and the absence of sap vacuoles. They release large quantity oRead more
Some cyanobacteria or blue-green algae like Nostoc and
See lessOscillatoria can tolerate adverse conditions including
pollutants very well, as compared to other aquatic plants.
This is due to the presence of mucilage covering,
resistant proteins and the absence of sap vacuoles. They
release large quantity of spores, which are dispersed by air.
What are mesosomes and what its use in bacterial cell?
Mesosomes help in invagination of the membranes. Large septal mesosomes occur near centre of the cell and smaller lateral mesosomes away from the centre. Septal mesosomes help in cell division and lateral mesosomes assist in the reproduction of bacterial DNA chromosome.
Mesosomes help in invagination of the membranes.
See lessLarge septal mesosomes occur near centre of the cell and
smaller lateral mesosomes away from the centre. Septal
mesosomes help in cell division and lateral mesosomes
assist in the reproduction of bacterial DNA chromosome.
Give the name of causative agents of following diseases. Tuberculosis, Leprosy, Diphtheria, Pneumonia.
Causative agents of the following diseases are Tuberculosis Mycobacterium tuberculosis Leprosy Mycobacterium leprae Diphtheria Corynebacterium diphtheriae Pneumonia Diplococcus pneumoniae.
Causative agents of the following diseases are
See lessTuberculosis Mycobacterium tuberculosis
Leprosy Mycobacterium leprae
Diphtheria Corynebacterium diphtheriae
Pneumonia Diplococcus pneumoniae.
State two economically important uses of
(i) Heterotrophic bacteria They decompose dead bodies of plants and animals. So, they are nature's scavengers, the organic content of sewage is broken down by these bacteria. They also generate humus which is used in agriculture. (ii) Archaebacteria They are used in gobar gas (biogas) production andRead more
(i) Heterotrophic bacteria They decompose dead
See lessbodies of plants and animals. So, they are nature’s
scavengers, the organic content of sewage is broken
down by these bacteria. They also generate humus
which is used in agriculture.
(ii) Archaebacteria They are used in gobar gas (biogas)
production and are helpful causing fermentation of
cellulose in ruminants.
Why are cysts formed in protistans?
Cysts formation helps to overcome unfavourable condition for reproduction.
Cysts formation helps to overcome unfavourable
See lesscondition for reproduction.
Why there large population of protists?
Due to the presence of rapid asexual reproduction.
Due to the presence of rapid asexual reproduction.
See less