Download App

Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Rajasthan 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→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

  1. How are recombinant vectors created?
  2. For creating one recombinant vector only one type of restriction endonuclease is required. Give reason.
→
Why are some seeds referred to as apomictic seeds? Mention one advantage and one disadvantage to a farmer who uses them.
→
Briefly describe industrial Melanism?
→
What is corona radiata?
→
Explain human female reproductive system.
→
  1. Mature seeds of legumes are non-albuminous.Then, can it be considered that double fertilization does not occur in legumes? Explain your answer.
  2. Write one similarity and one difference between autogamy and geitonogamy.
→
What is artificial selection? Explain with examples?
→
Rearrange the following in the correct sequence to accomplish an important biotechnological reaction:
  1. In vitro synthesis of copies of DNA of interest.
  2. Chemically synthesised oligonucleotides.
  3. Enzyme DNA-polymerase.
  4. Complementary region of DNA.
  5. Genomic DNA template.
  6. Nucleotides provided.
  7. Primers.
  8. Thermostable DNA-polymerase (from Thermus aquatics).
  9. Denaturation of ds-DNA.
→
Some parents wrote a complaint letter to the local municipality to remove all the hoardings in the city, advertising the use of condoms and matters relating to AIDS prevention. The children of these parents came to know about the matter and raised their voice against removal of the hoardings. The parents were convinced by the awareness level of their children and withdrew the complaint.
  1. Parents considered the hoarding as inappropriate. Do you agree/ disagree with their view?
  2. What are the methods by which AIDS spreads?
  3. What is AIDS?
  4. What values are promoted by the children protesting against their parents?
→
Rearrange Ramapithecus, Australopithecus and Homo habilis in the order of their evolution on the Earth. Comment on their evolutionary characteristics.
→