Download App

STD 12 - 12. ecosystem — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 12. ecosystem1 Mark
MCQ
Humus is
  • A
    Dark coloured amorphous organic matter rich in lignin
  • ✓
    Dark coloured organic matter rich in cellulose
  • C
    Both $(a)$ and $(b)$
  • D
    Red coloured substances rich in iron
✓

Answer

Correct option: B.
Dark coloured organic matter rich in cellulose
b
Humus is dark coloured amorphous substance rich in lignin and cellulose

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 STD 12 - 12. ecosystem→STD 12 - 12. ecosystem — all question types→Biology STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Which of the following is correct

$I.$ In a population, birth rate and death rate refer to per capita births and death respectively

$II.$ In nature, we rarely find isolated single individuals of any species

$III.$ The size of population for any species is stable phenomena

$IV.$ Ecological effects of any factors on a population growth are generally reflected in its size/population density

→
Darwinian theory was unable to explain
→
Palaentological evidences for evolution refer to the:
→
The factor that enriches the gene pool with new modified genes is:
→
Fossil $X$ is older than fossil $Y$ if
→
Match each disease with its correct type of vaccine.
Column $-I$ Column $-II$
$(A)$ Tuberculosis $(i)$ Harmless virus
$(B)$ Whooping cough $(ii)$ Inactivated toxin
$(C)$ Diphtheria $(iii)$ Killed bacteria
$(D)$ Polio $(iv)$ Harmless bacteria
→
In human beings retrovirus is considered as a cause of cancer because
→
Restriction enzymes are isolated chiefly from?
→
A prokaryotic autotrophic nitrogen-fixing symbiont is found in:
→
Which of the following generally used for induced mutagenesis in crop plants
→