NEET Practice Questions (MCQs) with Answers & Solutions

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Full form of BOD.

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Explanation

BOD stands for Biochemical Oxygen Demand. It is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. It is an important parameter for assessing water quality.

By which process floating debris and grit are removed in STPs respectively ?

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Explanation

In Sewage Treatment Plants (STPs), floating debris is removed by filtration, and grit (like sand and small stones) is removed by sedimentation. Filtration helps in removing large particles, while sedimentation allows heavier particles to settle at the bottom.

Which is useful to control Nematodes in cereal crops?

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Explanation

Bionemotocides are biological agents that control nematodes, which are harmful to cereal crops. These agents can include beneficial bacteria, fungi, or other organisms that target nematodes specifically, thereby protecting the crops.

Which sentence is odd?

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Which microorganisms involved in flocks as well as in mycorrhiza?

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Explanation

Fungi are involved in both flocks and mycorrhiza. Flocks are aggregates of microorganisms, including fungi, used in wastewater treatment. Mycorrhiza involves a symbiotic association between fungi and plant roots, aiding in nutrient absorption.

Find odd group out: -

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Which pest is obtained from Pseudomonas?

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Which organisms useful to prepare Alcohol?

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Explanation

The correct organism useful for preparing alcohol is Saccharomyces Cerevisiae. This species of yeast is commonly used in the fermentation process to produce ethanol (alcohol) from sugars. The correct option is 'Saccherohmycis Cerevisiae', despite the typo in the spelling.

which of these nitrogen fixing bacteria does not live in symbiotic association with host plant?

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Explanation

Azotobacter is a free-living nitrogen-fixing bacterium that does not form symbiotic associations with plants. In contrast, Rhizobium and Frankia form symbiotic relationships with leguminous plants and actinorhizal plants, respectively. Xanthomonas is not known for nitrogen fixation.

Which is correct sequence for purification process of STPs?

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Explanation

The correct sequence for the purification process of Sewage Treatment Plants (STPs) is: Primary Sludge -----> Effluent -----> Flocks -----> Active Sludge -----> Biogas. This sequence involves the initial removal of primary sludge, followed by the treatment of effluent, formation of flocks, conversion to active sludge, and finally biogas production.

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