The degradation of humus by microbes to release inorganic nutrients is known as-

The disease phenylketonuria is an example of :

Inactive protoxins is converted into its active toxin by:

Find the odd one out with reference to terrestrial ecosystem:

The term "biodiversity" was popularised by:

Read the passage carefully and answer the questions based on the passage:
Species diversity on earth is not uniformly distributed. It is generally highest in the tropics and decreases towards the poles. Earth's fossil history reveals the incidences of mass extinctions in the past. Earth's rich biodiversity is vital for the very survival of mankind. It is believed that communities with high diversity tend to be less variable and more productive. The reasons of conserving biodiversity are narrowly utilitarian, broadly utilitarian and ethical. Biodiversity conservation may be in-situ as well as ex-situ.
How many episodes of mass extinction of species have occurred since the origin and diversification of life on earth?

Match List-l with List-ll

List-l (Term)	List-II (Feature)
(A) Multiple alleles	(I) Variation in DNA
(B) Mendelian disorder	(II) Non segregation of chromatids during cell division
(C) Chromosomal disorder	(III) Pedigree analysis
(D) Mutation	(IV) Population study

Choose the correct answer from the options given below:

Which one of the following contributes the maximum percentage to the biodiversity of a vertebrate group?

Alkyl halides react with sodium to give alkanes with double number of carbon atoms in

Arrange the following in increasing number of quantum number when coming from excited energy state:
A. Lyman Series
B. Balmer Series
C. Paschen Series
D. Brackett Series
E. Pfund Series
Choose the correct answer from the options given below:

The points on the curve \(\frac{x^2}{9}+\frac{y^2}{16}=1\) at which the tangents are parallel to \(x\) - axis are:

After 4 hours, \( \frac{1}{16} \) of the initial amount of a certain radioactive isotope remains undecayed. What is the half life of the isotope?

Calculate the lowering of vapour pressure caused by the addition of \(5 0 ~ g\) of sucrose (mol mass = \(3 4 2 ~ g / m o l\) ) to \(7 5 0 ~ g\) of water, if the vapour pressure of pure water at Ambient temperature is 23.8 mm Hg