1. plasmodium is a which causes in humans.2. changes nitrogen of air into ammonia.3. a drug that kills level 24. why viruses lie in the borderline of living and non-living? 5. streptococcus, lactobacillus, vibrio choleraehow are these microorganisms a) similar and b) different? 6. find the odd one out and give a reason for your choice. a) amoeba, volvox, paramoecium, euglenab) i. mushrooms are eaten as food. ii. used in fermentation of alcoholiii. grows on leather footwear.7. why does milk take longer time to form curd in winter than in summer? 8. why should buildings be painted before rainy season? level 39. microorganisms are found in the intestine of certain animals. name the microorganisms. which component of food is digested by them? 10. we make pickles at home. do we use any natural preservative in it? which are the preservatives used? 11. why do aids patients have low immunity? 12. my mother forgot to keep the extra idli dough in the refrigerator after use on a summer day. at noon she found that the dough was overflowing and had become very sour. how did this happen?

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.