Download App

Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare3 Marks
Question
How BOD is related to water pollution?
✓

Answer

BOD stands for Biochemical oxygen demand. It indicates the rate of uptake of oxygen by microorganisms in a sample of water so it shows the presence of organic matter in water. More valve of BOD means more polluting potential.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Microbes in Human Welfare→Microbes in Human Welfare — all question types→BIOLOGY STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

(i) EcoRI has played a very important role in recombinant DNA technology.
(a) Explain the naming convention of Eco RI.
(b) Write the name of the recognition site and cleavage site of this restriction enzyme.
(ii) What is the longitudinal extension of DNA produced by these restriction enzymes called? Describe their role in the formation of r-DNA.
→
Write the specific symptoms of acquired immunity.
→
During a school trip to 'Rohtang Pass', one of your classmate suddenly developed 'altitude sickness'. But, he/she recovered after some time.
  1. Mention one symptom to diagnose the sickness.
  2. What caused the sickness?
→
What are chorionic villi?
→
  1. A parasite has to adapt to be able to live in the host. Write the various parasitic adaptations.
  2. Mention an adaptive feature exhibited in brood parasitism in Koel and Crow.
→
Fertilisation is essential for production of seed, but in some angiosperms, seeds develop without fertilisation.
  1. Give an example of an angiosperm that produces seeds without fertilisation Name the process.
  2. Explain the two ways by which seeds develop without fertilisation.
→
Depending upon the chemical nature of the template (DNA or RNA) and the nature of nucleic acids synthesized from it (DNA or RNA), list the types of nucleic acid polymerases.
→
Draw a schematic diagram of the E.coli vector PBR 322 and mark the following in it:
  1. Ori
  2. Rop
  3. Ampicillin-resistant gene
  4. Tetracycline-resistant gene
  5. Restriction site BamHI
  6. Restriction site EcoRI
→
Explain the process of pollination in Vallisneria. How is it different in water-lily, which is also an aquatic plant?
→
Name the kind of organisms which constitute the pioneer community of xerarch and hydrarch successions respectively.
→