Darwin's finches are an excellent example of
adaptive radiation
seasonal migration
brood parasitism
brood parasitism
A.
adaptive radiation
Adaptive radiation represents the evolution of new forms is several directions from the common anxcestral type. In 1831 Darwin got an opportunity to travel by H M S beagle for a voyage of world exploration. Beagle sailed to the Galapagos Islands, here Darwin found a living laboratory of evolution. The common birds of Galapagos Islands, the finches were markedly different from the finches of the main land. The closely related species of finches has beaks of different shapes and sizes and adapted for feeding on completely different diet showing adaptive radiation.
The transitional fossil forms, which show the characteristic of two different groups of living animals is called connecting links, eg, Archaeopteryx, Seymouria etc.
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
Thymine, Uracil - Pyrimidines
Uracil, Cytosine - Pyrimidines
Guanine, Adenine - Purines
Guanine, Adenine - Purines
Main objective of production/use of herbicide resistant GM crops is to
eliminate weeds from the field without the use of manual labour
eliminate weeds from the field without the use of herbicides
encourage eco- friendly herbicides
encourage eco- friendly herbicides
The table below gives the populations (in thousand) of ten species (A-J) in four areas (a-d) consisting of the number of habitats given within brackets aginst each. study the table and answer the question which follows:
|
Area and number of habitats
|
Species and their populations (in thousands) in the area |
|||||||||
|
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
|
|
a(11) b(11) c(13) d(12) |
23 |
1.2 |
0.52 |
6.0 |
- |
3.1 |
1.1 |
9.0 |
- |
10.3 |
|
10.2 |
- |
0.62 |
- |
1.5 |
3.0 |
- |
8.2 |
1.1 |
11.2 |
|
|
11.3 |
0.9 |
0.48 |
2.4 |
1.4 |
4.2 |
0.8 |
8.4 |
2.2 |
4.1 |
|
|
3.2 |
10.2 |
11.1 |
4.8 |
0.4 |
3.3 |
0.8 |
7.3 |
11.3 |
2.1 |
|
Which area out of a to d shows maximum species diversity?
b
c
d
d
To which type of barriers under innate immunity, do the saliva in the mouth and the tears the eyes, belong?
Cytokine barriers
cellular barriers
Physiological barriers
Physiological barriers
What is true about the isolated small tribal populations?
There is a decline in population as boys marry girls only from their own tribe
Hereditary diseases like colour blindness do not spread in the isolated population
Wrestlers who develop strong body muscles in their lifetime pass this character on their progeny
Wrestlers who develop strong body muscles in their lifetime pass this character on their progeny
Human insulin is being commericially produced from a transgenic species of
Escherichia
Mycobacterium
Rhizobium
Rhizobium
Cry-I endotoxins obtained from Bacillus thringiensis are effective against
mosquitoes
flies
nematodes
nematodes
Which one of the following is not observed in biodiversity hot spots?
Endemism
Accelerated species loss
Lesser interspecific competition
Lesser interspecific competition
Consider the statements given below regarding contraception and answer as directed thereafter
A) Medical Termination of Pregnancy (MTP) during first trimester is generally safe
B) Generally chances of conception are nil until mother breast -feeds the infant upto two year
C) Intrauterine devices like copper T- are effecitve contraceptives
D) Contraception pills may be taken upto one week after coitus to prevent conception
Which two of the above statements are correct?
B, C
C, D
A, C
A, C
