1) Why fungi are called natural scavengers?
2) Why viruses are considered being in borderline between living and non-living organisms?
3) Name a free living nitrogen fixing bacteria.
4) Name the bacteria which helps in curdling of milk
5) What type of respiration does yeast perform?
Answers
1. Fungi(singular fungus) are known as natural scavengers because they help in decomposition right from the basic stage and rely on dead and decaying matter. They feed(in this case "grow") on dead and decaying matter just like other scavengers and this is the chief characteristic.
2. Viruses are considered as "living" by some people and "non living" by some people depending upon where they live. Sometimes they stay on the body surface of an animal externally while sometimes internally. On this basis, it is quite hard to differentiate whether they are living or not, whether they reproduce or not and hence there is a very thin line of difference between living and nonliving organisms.
3. Rhizobium is the most common form of nitrogen fixing bacteria.
4. Lacto-bacillus is a bacteria that greatly helps in curdling of milk.
5. Yeast performs the mechanism of cellular respiration.
1) The fungus is called natural scavengers as they grow on decomposed food and other dead organisms.
2) Viruses are considered as being the borderline between the non-living and living organisms because when outside the host the viruses are almost non-living but when they are present inside the host they start procreating and act like living organisms.
3) A free-living nitrogen-fixing bacteria is Azotobacter.
4) Curdling of milk occurs as bacteria start reproducing and building colonies. A bacteria that is responsible for conducting the same is Lactococcus lactis. This bacteria works on the enzymes present in the milk to create lactic acid.
5) Yeast conducts aerobic respiration and releases carbon dioxide that helps the dough to rise when yeast is added to it with warm water.
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