Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?
They were able to reproduce
They could separate combinations of molecules from the surroundings
They were partially isolated from the surroundings
They were partially isolated from the surroundings
D.
They were partially isolated from the surroundings
Homoeostasis is keeping the internal environment of the body constant. It is necessary for normal life processes. Microspheres are molecular aggregates of proteinoids. Oparin and Sydney Fox held that large organic molecules synthesized abiotically on primitive earth formed large colloidal aggregates due to the intermolecular attraction. These colloidal particles were called coacervates. Oparin called giant nucleoprotein poid molecules as protobionts. These reproduce either by budding a binary fission but do not exhibit homoeostasis.
Darwin's finches are an excellent example of
adaptive radiation
seasonal migration
brood parasitism
brood parasitism
The most apparent change during the evolutionary history of Homo sapiens is traced in
loss of body hair
walking upright
shortening of the jaws
shortening of the jaws
Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements.
A) Wings of butterfly and birds look alike and are the results of ...... (i) .... evolution.
B) Miller showed that CH4, H2, NH3, and .....(i) ....., when exposed to electric discharge in a flask resulted in the information of ......(ii) .....
C) The vermiform appendix is a ..... (i) ..... organ and a ......(ii) ..... evidence of evolution.
D) according to Darwin evolution took place due to ....(i) ...... and .....(ii) .... of the fittest.
(D)-(i) small variations, (ii) survival, (A)-(i) convergent
(A)- (i) convergent, (B)-(i) oxygen,(ii) nucleosides
(B)-(i) water vapour, (ii) amino acids (C)-(i) rudimentary, (ii) anatomical
(B)-(i) water vapour, (ii) amino acids (C)-(i) rudimentary, (ii) anatomical
In the case of peppered moth (Biston betularia), the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of
natural selection whereby the darker forms were selected
the appearance of the darker coloured individuals due to very poor sunlight
protective mimicry
protective mimicry
