LIFE-ITS ORGIN, EVOLUTION AND MAINTENANCE

Life- Its Origin, Evolution and Maintenance

1. The origin of life is due to

a. Spontaneous generation b. Will of God c. Effect of Dun rays on mud

d. None of the above

2. We have taken study of exobiology because

a. Earth is over crowded

b. People want to live in space

c. It is human nature to explore the unknown

d. Security of earth can be better managed.

3. The first organisms to appear on earth were more like plants as they

a. were simpler b. were more c. did photosynthesis d. all correct

4. Most of the early molecules during origin of life were compounds of

a. Hydrogen b. Oxygen c. Nitrogen d. Carbon

5. First mammal appeared some________ million years ago

a. 220 b. 150 c. 308 d. 2000

6. Progenote is

a. Eubcteria b. Archaebacteria c. Ancient form of life d.Viruses.

7. Life without air is

a. Impossible b. Anaerobic c. Reductive d. Free from oxidation

8. Primitive atmosphere of earth contained Hydrogen, Ammonia and

a. CO2 b. N2 c. O2 d. CH4

9. In the origin of life, the most important compound was

a. Protein b. Amino acid c. Nucleic acid d. DNA

10. Evolution is

a. Biogenesis b. Abiogenesis c. Constant gradual changing d. None

11. First life was

a. Virus b. Bacteria c. Protovirus d. Provirus

12. The first genes evolved were

a. DNA b. Ribonucleotides c. Virions d. Prions.

13. The first organisms to give off oxygen gas were probably the

a. methanogens b. cyanobacteria c. anaerobic chemoheterotrophs

d. euglens

14. The theory believing that life comes from other planets is called

a. Cosmozoic theory b. Abiogenesis theory c. Biogenesis theory

d. Chemical theory.

15. Planet nearest to sun is

a. Earth b. Moon c. Mercury d. Mars

16. Star close to earth

a. Mars b. Alpha centauri c. Venus d. Moon

17. The first organisms on this earth were

a. Aerobic b. Anaerobic c. Autotrophic d. Photosynthetic

18. The era dubbed as “ Age of Prokaryotic Nicrobes” is

a. Procambrian b. Archean c. Proterozoic d. Phaenerozoic

19. Soil samples collected from the surface of moon were analysed to find out the availability of a

compound that makes life possible. It is

a. Protein b. Nucleoprotein c. Water d. Protoplasm

20. In a food chain, carnivores occupy position of

a. Primary producers b. Primary consumers c. Tertiary cibsyners

d. Secondary consumers

21. There is a complementarity of structure and function. Which of the following is not an

example of complementarity?

a. Cockroach has biting and chewing mouth parts.

b. Total animal parasite (tapeworm) does not have elaborate organ system

c. Dolphin can imitate human speech d. Presence of cuticle on insects and plants

22. The process that changed the life styles of the organisms

a. Photosynthesis b. Respiration c. Both a and b d. reproduction

23. Chemical theory of origin of life was given by

a. Stanley Miller b. Louis Pasteur c. Spallanzani d. Oparin and Haldane

24. Presence of NaCl in body fluid indicates that life originated in

a. Rain water lakes b. Primitive ocean c. Salt solution d. All of these.

25. The synthesis of first protein during the origin of life was

a. From DNA b. From RNA c. From DNA and RNA both

d. Without nucleic acid and biocatalyst..

ANSWERS

1. d 2. c 3. a 4. a 5. a 6. c 7. b 8. d 9. c 10. d

11. c 12. b 13. a 14. a 15. c 16. b 17. b 18. a 19. c 20. d

21. c 22. a 23. d 24. b 25. d