Eutrophication of water bodies leading to killing of fishes is mainly due to nonavailability of.
A) food
B) light
C) essential minerals
D) oxygen
Explanation: Eutrophication is the nutrient enrichment of a water body due to natural or accelerated/cultural factors like run-offs from land that causes the growth of plant life(algae) in it. These algae uptake the oxygen dissolved in the water making it unavailable and leading to the death of fishes, whose decomposing remains further deplete the water body of dissolved oxygen.
So, the correct option is ' oxygen'.
A place of thin wire that is used in an electric circut to protect electrical appliances is called _________.
A) Fuse
B) Diode
C) Integrated dcuit
D) Capacitor
The number of different smells that a human can differentiate when his nose is at best can range between:
A) 1000-4000
B) 2000-6000
C) 3000-8000
D) 4000-10000
Central nervous system is divided into __________organs.
A) two
B) three
C) four
D) five
Explanation: 1. Brain and 2. Spinal cord
B.F. Skinner showed a system of rewards and punishments shapes a response’ through his experiments called.
A) Classical conditioning
B) Operand conditioning
C) Positive conditioning
D) Appreciable conditioning
The Beginning Tender Evaluation Study (BTES) hypothesized that the acquisition of knowledge in the classroom is best concealed as a_________.
A) Uni-year process
B) Important process
C) Behavioral process
D) Multi-year process
