Tag: evs
Questions Related to evs
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 | ||
|---|---|---|---|
| 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.
Algae attached to stones are called ___________.
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Epiploic
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Coenolithic
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Epilithic
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None of the above
Algae growing on a rock is called as epilithic. Endolithic algae live in porous rocks or coral and chasmolithic algae grow in rock fissures. So, option C is the correct answer.
Largest unicellular organism is ___________.
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Yeast
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Acetabularia
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Planaria
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Volvox
Plants which are mostly found on the sides of pond is
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Grass
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Algae
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Wheat
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All of the above
Algae are unicellular or multicellular photosynthetic, eukaryotic organisms that can occur in salt or fresh waters, or on the surfaces of moist soil or rocks. Algae make their own energy or food from the sun but they also need water, correct temperature and nutrients to grow. Hence they usually live in water or damp environments. Algal growth is a natural occurrence in all water bodies and is the base of the aquatic food chain.
Which of the following gives shelter to grow mosquito larva?
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Dark box
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Algae
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Fruits
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None of the above
Most species of algae live in the water bodies like sea, lakes, ponds, etc. Even some unicellular green algae inhabit moist conditions on land, for example - tree trunks, moist soil surface, damp walls, wetlands, swamps, etc. Usually, the insect mosquito prefers stagnant water and damp environment for laying eggs. The eggs hatch and the larvae live in water until they transform into motile pupae, from which the adult mosquito emerges. Due to this, the algae serve as an excellent shelter for growing mosquitoes. Even mosquito larvae that need constant energy to grow, eat plankton, algae, fungi and other microbes present in their habitat. Therefore, algae not only harbor mosquito larvae but also feed those growing insects. So to keep the water bodies pleasant and beautiful, algae and weeds must be regularly removed from them; as they provide growing mosquitoes with housing, nutrition, and hideaway from predators.
Phycology deals with study of
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Algae
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Fungi
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Microbes
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Bryophytes
Phycology is the scientific study of algae. Phycology or Algology is a branch of life science and often is regarded as a sub-discipline of botany. Algae are important as primary producers in aquatic ecosystems. Hence, the phycology deals with the study of algae.