Tag: algae: benefits and harmful effects
Questions Related to algae: benefits and harmful effects
Stomata do not occur in ________.
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Algae
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Liverworts
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Mosses
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Ferns.
Sea Lettuce is _____________.
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Laminaria
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Chlorella
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Sargassum
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Alva
The most important character which is used in classifying different algae is
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Cell wall structure
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Habit
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Types of pigments
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None of the above
The seven divisions of organisms that are considered within the algae are the Euglenophyta, Chrysophyta, Pyrrophyta, Chlorophyta, Rhodophyta, Paeophyta, and Xanthophyta. These divisions are separated on the basis of various features including their morphology and the biochemistry of their pigments, cell walls, and energy-storage compounds. The colors of these various algae types differ according to their particular mixtures of photosynthetic pigments, which typically include a combination of one or more chlorophylls and various accessory pigments.
Slimy, green patches in ponds or in stagnant water is
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Fungi
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Bryophytes
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Bacteria
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Algae
One of the simplest multicellular organisms is algae. They are seen growing in the freshwater of marine habitats. They are also eukaryotic organisms. Algae can grow rapidly when exposed to stagnant waters. An adequate amount of sunlight, temperature and aquatic habitat leads to the rapid growth of slimy, green patches containing chlorophyll called algae.
Cell wall of Chlamydomonas possesses _____________.
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Cellulose
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Glycoproteins
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Hemicellulose
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Proteins only.
The cell wall of the unicellular green alga Chlamydomonas consists of glycoproteins, which also occurs in the extracellular matrix of multicellular green algae and higher plants.
Algae have cells made up of
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cellulose, galactans and mannans
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hemicellulose, pectins and proteins
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pectins, cellulose and proteins
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cellulose, hemicellulose and pectins.
Algae have a cell wall containing cellulose, Galatians, and mannan.
Heterocysts and present in ______________.
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Riccia
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Ulothrix
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Albugo
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Nostoc
Heterocysts are the thick-walled cells formed in cyanobacteria (Nostoc) and are responsible for nitrogen fixation in the state of nitrogen starvation by the use of enzyme nitrogenase. These are specialized pale yellow structures which help in nitrogen formation during aerobic conditions.
The correct answer is D.
Match the items in column I with column II and chose the
correct option
Column I | Column II | ||
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A | Binary fission | 1 | Algae |
B | Zoospore | 2 | Amoeba |
C | Conidium | 3 | Hydra |
D | Budding | 4 | Penicillium |
E | Gemmules | 5 | Sponge |
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A-1; B-4; C-5; D-3; E-2
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A-2; B-1; C-4; D-3; E-5
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A-2; B4; C-3; D-5; E-1
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A-1; B-4; C-3; D-2; E-5
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A-4; B-1; C-3; D-5; E-2
Binary fission is a form of asexual reproduction in Amoeba. Zoospore is the flagellated spores present in algae for the means of asexual reproduction. Conidia are unicellular asexually produced spores in penicillium. Hydra reproduces by budding by the use of regenerative cells. Sponge reproduce asexually by gemmules which are the internal buds found in sponges.
The correct answer is B.
Algae are important, we should study algae because
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They are easiest to experiments with.
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They can be grown in large tank cultures.
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They may form important constituent of human food (diet) in future.
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They produce oxygen and organic acids.
Algae are important as primary producers of organic matter at the base of the food chain. They also provide oxygen for other aquatic life. Algae may contribute to mass mortality of other organisms, in cases of algal blooms, but they also contribute to economic well- being in the form of food, medicine and other products. In tropical regions, coralline algae can be as important as corals in the formation of reefs. They may form important constituent of human food (diet) in future. In future when world population will be very much, to provide them all nutritious food, algae will be used as alternate source of energy.
Which of the following pigments are present in algae?
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Chlorophyll
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Hemoglobin
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Plasma
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None of the above
The major pigments present in algae is chlorophyll. It is a photosynthetic pigment. Apart from it, algae contain carotenoids and phycobilins pigments. Haemoglobin pigment is present in the red blood cells. It carries oxygen from the lungs to different parts of the body. Plasma is the colourless liquid part of the blood which contains all the components of blood except red blood cells, white blood cells and platelets.