For the following questions answer them individually
Biochemical Oxygen Demand (BOD) may not be a good indexfor pollution for water bodies receiving effluents from
The principle of competitive exclusion was stated by
Which of the following National Parks is home to the famous musk deer or hangul?
A lake which is rich in organic waste may result in
The highest DDT concentration in aquatic food chain shall occur in
Which of the following sets of diseases is caused by bacteria?
Match Column—I with Column—II for housefly classification and select the correct option using the codes given below :

Choose the correct statement.
Study the four statements (A-D) given below and select the two correct ones outof them :
A. Definition of biological species was given by Ernst Mayr.
B. Photoperiod does not affect reproduction in plants.
C. Binomial nomenclature system was given by R. H. Whittaker.
D. In unicellular organisms, reproduction is synonymous with growth
The two correct statements are
In male cockroaches, sperms are stored in which part of the reproductive system?