ANS fast (12th Biology)............
Answers
Explanation:
1st one option d
2nd one option a
3rd one option d
Answer:
1) b
2) c
3) a
4) a
Explanation:
1) A monohybrid cross is a mating between individuals who have different alleles at one genetic locus of interest. The characters being studied in a monohybrid cross are governed by two alleles for a single locus. Mendel formulated the law of purity of gametes on the basis of monohybrid cross.
Thus, the correct answer is option B.
2)Tryptophan is the precursor for the production of the plant growth hormone indole-3-acetate, or auxin, which has been implicated in the regulation of a wide range of biological processes in plants.
3)The term biofertilizers refer to the substance containing living or dried powder of microorganisms, it may be used to include all organic resources (manure) for plant growth which are rendered in an available form for plant absorption through microorganisms or plant associations or interactions. Biofertilizers are three types, nitrogen fixing bacteria, nitrogen-fixing cyanobacteria and mycorrhiza e.g., Rhizobium, Azotobacter, Azolla, Nostoc, Azospirilium and blue-green algae have been in use a long time. Thus, the correct answer is option A.
4)ANSWER
Propionibacterium is a Gram-positive, non-motile bacterium that plays an important role in the creation of Emmental cheese, and to some extent, Jarlsberg cheese, Leerdammer and Maasdam cheese. Its concentration in Swiss-type cheeses is higher than in any other cheese. It is this Propionibacterium that is responsible for the holes in Swiss cheese. Through the process of consuming the lactic acid, the bacteria produces acetate, propionic acid, and carbon dioxide as a by product.