Biology MCQS

641. Replantation of plants in the areas where they were present earlier is called:
A: Deforestation
B: Afrorestation
C: Forestation
(D) Reforestation

642. Establishment of new forests where no forest existed previously is called:
A: Deforestation
(B) Afforestation
C: Forestation
D: Reforestation

643. Balance in the nutrient cycle can be upset when:
A: Too much food is consumed
B: Not enough food is produced
(C) Decayed nutrients are not returned to the ground
D: All of these

644. In the air, nitrogen is:
A: 57%
B: 50%
C: 60%
(D) 79%

645. Incomplete burning of carbon compounds causes the release of:
A: Carbon Dioxide
(B) Carbon monoxide
C: Oxide of nitrogen
D: CFCs

646. The nature of human interaction with the global environment changed with:
A: Agriculture practice
(B) Industrialization
C: Urbanization
D: All of these

647. Ribosomes are assembled in__________?
(A) Nucleolus
B: Nucleus
C: DNA
D: RNA

648. Far-red light promotes flowering in_______________?
A: Short day plant
(B) Long day plant
C: Day neutral plant
D: None of these

649. Which of the following is not present in mitochondria?
A: Enzymes
B: Co-enzymes
C: Ribosomes
(D) Thylakoids

650. Secretin inhibits the production of__________________?
A: Gastric juice
(B) Pancreatic juice
C: Bile
D: All of these