- Which one of the following is incorrect
about the characteristics of protobionts as
envisaged in the abiogenic origin of life?
(a) They were able to reproduce sexually
(b) They could separate combinations of
molecules from the surroundings
(c) They could maintain an internal
environment
(d) They were partially isolated from the
surroundings
- In the early atmosphere , the organic
molecules once formed accumulated in
water and their degradation was extremely
slow. Why suchtransformation is not
possible in the present atmosphere?
(a) Microbes will decompose living
particles that arise by more chance
(b) Reducing atmosphere will reduce the
molecules
(c) Oxidising atmosphere will oxidize
molecules
(d) Both (a) and (c)
- Which of the following is not evidence for
the role of endosymbiosis in the origin of
eukaryotes?
(a) The DNA in the eukaryotes nucleus
codes for some enzymes in mitochondria
(b) Mitochondria reproduced by binary
fission
(c) Chloroplasts have their own DNA.
(d) The inner membrane of a chloroplast is
similar to prokaryotic membrane.
EVOLUTION
- The change of the lighter coloured variety
of peppered moth, Biston betularia to its
darker variety (Carbonaria) is due to
(a) Deletion of a segment of genes due to
industrial pollution
(b) Translocation of a block of genes in
chromosomes in response to heavy
carbons
(c) Industrial carbon deposited on the wings
of the moth resulting in darker variety
(d) Mutation of single mendelian gene for
survival in smoke laden industrial
environment.
- Which of these statements is true?
(a) A higher percentage of dark moths
were recaptured in the country compared
to dark moths recaptured in the city.
(b) A higher percentage of light moths
were recaptured in the city compared
to dark moths recaptured in the city.
(c) A higher percentage of light moths were
recaptured in the country compared to
dark moths recaptured in the country.
