Download App

Enhancement of Food Production — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYEnhancement of Food Production4 Marks
Question
What is sewage? Describe its composition
✓

Answer

  1. Sewage is the waste matter carried off on drainage.
  2. Composition of sewage varies depending upon its industrial source, e.g. textile, chemicals, pharmaceuticals, dairy, canning, brewing, meat packing, tannery, oil refineries and meat industries, etc.
  3. Sewage consists of human excreta, animal dung, household waste, slaughter house waste, dissolved organic matter, algae, nematodes, pathogenic bacteria, viruses and protozoa, discharged waste water from hospitals, industries (contains toxic dissolved organic and inorganic chemicals), tannery and pharmaceutical waste, etc.
  4. Bacteria in sewage include coliforms, fecal Streptococci, anaerobic spore forming bacilli and other bacteria found in human intestinal tract.
  5. Sewage consists of about water (99.5% to 99.9%) and inorganic and organic matter (0.1 to 0.5%) in suspended and soluble form.

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 "Answer the following in detail :" from Enhancement of Food Production→Enhancement of Food Production — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

What is meant by respiration? How is it useful in the production of energy?
→
Give reasons: Testes are located outside the body cavity in scrotal sacs.
→
Restriction enzymeRecognition sequence
(1) Alu I(a) 5′ G-A-A-T-T-C 3′

 

3′ C-T-T-A-A-G 5’

(2) Bam HI(b) 5′ G-T-C-G-A-C3′

 

3′ C-A-G-C-T-G 5′

(3) Eco RI(c) 5′ A-G-C-T 3′

 

3′ T-C-G-A5′

(4) Hind II(d) 5′ G-G-A-T-T-C 3′

 

3′ C-C-T-A-A-G 5′

→
How sheep are genetically altered to produce wool of better quality?
→
Describe the process of double fertilization in angiosperms and add a note on its significance.
→
Since your earlier school days you have been solving mysteries/puzzles labelled as use your brain power. Did you ever wonder why human brain has such a capacity? Why and how we evolved along these lines? What is the extent of similarity between humans, chimpanzees and monkeys?
→
Match the hormones with their source
Column AColumn B
(1) Glucagon(i) Neurohypophysis
(2) Adrenaline(ii) Islets of Langerhans
(3) Somato tropins(iii) Adenohypophysis
(4) ADH(iv) Medulla
→
(a) Describe any three adaptations in anemophilous flowers. Mention any one example of anemophilous flower.
(b) Describe any three adaptations in hydrophilous flowers. Mention any one example of the hydrophilous flowers.
→
How is puberty attained in females? Will a female normally remain reproductively capable even after age 50? If not then what makes her incapable?
→
Food
→