(b) The skull of modern human resembles
more closely to baby chimpanzee
(c) Homo erectus lived in east and central
Asia and used hides to protect their bodies
(d) All of these
- Arrange the following human ancestors in
ascending order, from earliest to latest:
i. Homo erectus
ii. Australopithecus
iii. Homo habilis
iv. Homo neanderthelensis
(a) ii, i, iii, iv (b) i, ii, iii,iv
(c) iv,iii,i,ii (d) ii,iii,i,ii - a 2. d 3. d 4. a 5. c
- c 7. a 8. d 9.d 10. c
- c 12. b 13. b 14. a 15. c
- d 17. d 18. b 19. a 20. b
- d 22. d 23. a 24. b 25. d
- a 27. c 28. d 29. a 30. b
- b 32. d 33. c 34. d 35. b
- d
- (a) Microspheres and coacervates did not
reproduce sexually instead they reproduced
asexually by budding and fission. - (d)
- (d) Origin of a eukaryotic cell is by a
symbiotic origin or by invagination. As
per symbiotic origin of eukaryotic cell,
primitive aerobic bacteria was engulfed
by anaerobic predator cell and it could
not digest the engulfed particle. So the
engulfed anaerobic particle got itself
established into the host cell as an symbiont
(Endosymbiont). Predator host cell became
an eukaryotic cell. The predator host cell
which captured both aerobic bacteria and
blue green algae became an eukaryotic
plant cell. Aerobic bacteria established
itself as mitochondria and blue green algae
established itself as chloroplast.- (a) 5. (c) 6. (c)
- (a) Once inter-breeding population of
finches , now have failed to produce fertile
F1 hybrids this means they have now
formed two distinct species - (d) Presence of evolution of different species
in a given geographical area starting from a
point and radiating to other habitats is called
Adaptive Radiation. - (d)
- (c) Microspheres are microscopic membrane
bound spheres formed when protenoids are
boiled in water and allowed to cool.
11.(c) Tyrannosaurus rex was 20 feet in height
and had huge fearsome dagger like teeth.
Lobefin fish evolved into first amphibians.
Theses fish had thick and stout fins, and
could move on land move back to water.
Around 200 mya, some reptiles went back
to water and developed fish like characters,
to form ichthyosaur. Reptiles of different
shapes and sizes dominated on earth around
200 mya. Mesozoic era is called age of
reptiles. - (b) 13. (b)
- (a) The Capsules had molecules which had
ability of self replication. - (c) 16. (d) 17. (d) 18. (b)
- (a) Australian mole resemble to that of the
mole of Europe or North America. This
is the result of convergent evolution, in
which similar features develop separately
in different species due to same selection
pressures. - (b) Once the average value of fitness
(Phenotype) meets the enivornmental
changes, directional selection will be over
taken by stabilizing natural selection. - (d) This is according to use and disuse
theory, i.e., if a organ is used more often
then it gets stronger. The person who does
the work in fields and hold the sickles etc
in the hand, for them the epidermis on palm