The unequivocal proof that DNA is the genetic material came from the experiments of -

The mass of living organisms at a particular time at each trophic level is called____________

The lactic acid bacteria (LAB) improves nutritional quality of curd by increasing the content of -

The big holes in Swiss cheese are due to:
(A) Production of large amount of \(O _2\)
(B) Production of large amount of \(CO _2\)
(C) Production of large amount of \(H _2\)
(D) Bacterium Propionibacterium sharmanii
(E) Lactobacillus casei
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Which one of the following is not fermented by microbes to make foods?

Match List-I with List-II

List-I (Types of parasite)	List-II (Examples)
(A) Ectoparasite	(I) Cuckoo
(B) Brood parasite	(II) Human liver fluke
(C) Trematode parasite	(III) Mosquito
(D) Malarial parasite	(IV) Lice on human

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Observe the figure and answer the following:

Match List I with List II

LIST I	LIST II
A. Disrupting selection	I. A
B. Stabilising selection	II. D
C. Favouring medium sized individuals	III. C
D. Directional selection	IV. B

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An inverted pyramid of biomass can be found in:

The points on the curve \(2 x=y^2\) which are nearest to the point \((5,0)\) lie in
A. I Quadrant
B. II Quadrant
C. III Quadrant
D. IV Quadrant
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Match List I with List II

LIST I	LIST II
A. Parthenocarpic fruits	I. Fruit develops from fertilised ovary
B. True fruit	II. Apple
C. Apomixis	III. Asteraceae
D. False fruit	IV. Fruit develops without fertilisation

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Read the passage carefully and answer the Questions
The term vitamin was coined from the word vital +amine since the earlier identified compounds had amino groups. Later work showed that most of them didn't contain amino groups, so the letter "e" was dropped and ther term vitamin is used these days.
Vitamins are classified into two groups depending upon their solubility in water or fat. Fat soluble vitamins are soluble in fat and oils but insoluble in water. They are stored in liver and adipose (fat storing) tissues. Water-soluble vitamins are soluble in water. They must be supplied regularly in the diet as they are readily excreated in urine.
What are the sources of Vitamin B12?

Indium is mainly refined by :

Read the given passage carefully and answer the questions
Antibiotics have greatly improved our capacity to treat deadly diseases such as plague, whooping cough (kali khansi), diphtheria (gal ghotu) and leprosy (kusht rog), which used to kill millions all over the globe.
Streptokinase produced by the bacterium Streptococcus and modified by genetic engineering is used as a 'clot buster' for removing clots from the blood vessels of patients who have undergone myocardial infarction leading to heart attack. Microbes are diverse-protozoa, bacteria, fungi and microscopic animal and plant viruses, viroids and also prions that are proteinacious infectious agents. The puffed-up appearance of dough is due to the production of CO₂ gas. Similarly the dough, which is used for making bread, is fermented using baker's yeast (Saccharomyces cerevisiae). Primary sewage treatment basically involve physical removal of particles - large and small from the sewage through filtration and sedimentation. These are removed in stages; initially, floating debris is removed by sequential filtration. Then the grit (soil and small pebbles) are removed by sedimentation. All solids that settle form the primary sludge, and the supernatant forms the effluent. The effluent from the primary settling tank is taken for secondary treatment. The primary effluent is passed into large aeration tanks, where it is constantly agitated mechanically and air is pumped into it. This allows vigorous growth of useful aerobic microbes into flocs. While growing, these microbes consume the major part of the organic matter in the effluent.
Genetically modified Streptokinase is used as a 'clot buster' for removing clots from the blood vessels is produced by :