Download App

Environmental Issues — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYEnvironmental Issues1 Mark
MCQ
When domestic sewage mixes with river water:
  • A
    Small animals like rats will die after drinking river water.
  • B
    The increased microbial activity releases micro nutrients such as iron.
  • ✓
    The increased microbial activity uses up dissolved oxygen.
  • D
    The river water is still suitable for drinking as impurities are only about $0.1\%.$
✓

Answer

Correct option: C.
The increased microbial activity uses up dissolved oxygen.

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 "M.C.Q (1 Marks)" from Environmental Issues→Environmental Issues — all question types→BIOLOGY STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Which endangered animal is the source of the world’s finest, lightest, warmest and $-$ most expensive wool $-$ the shahtoosh?
→
Select incorrect statement regarding different population attributes
→
Implants under the skin and injectables contain
→
A $\text{DNA}$ with unequal nitrogen bases would most probably be:
→
Which term refers to the tiniest organisms that can only be seen through a microscope?
→
Which one of the following makes use of $\text{RNA}$ as a template to synthesize $\text{DNA}?$
→
One of the following is true with respect to $\text{AUG}:$
→
Product of sexual reproduction generally generates
→
For the manufacture of gluconic acid and citric acid, which of the following micro-organism is used
→
In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non$-$directional manner?
→