MCQ
The following ratio is generally constant for a given species:
- A
$\frac{ \text{T + C} }{ \text{G + A} }$
- B
$\frac{ \text{G + C} }{ \text{A + T} }$
- C
$\frac{ \text{A + C} }{ \text{T + G} }$
- D
$\frac{ \text{A + G} }{ \text{C + T} }$
$\frac{ \text{T + C} }{ \text{G + A} }$
$\frac{ \text{G + C} }{ \text{A + T} }$
$\frac{ \text{A + C} }{ \text{T + G} }$
$\frac{ \text{A + G} }{ \text{C + T} }$
Explanation:
The ratio of the sum of the adenine plus thymine bases to the sum of the guanine plus cytosine bases in a DNA molecule is called as $\frac{ \text{G + C} }{ \text{A + T} }$ ratio. Generally, $\frac{ \text{G + C} }{ \text{A + T} }$ ratio is constant for a given species. This ratio differs from species to species. However, it is constant for a given species. Species living in high temperature have high $\frac{ \text{G + C} }{ \text{A + T} }$ ratio as it gives stability due to triple hydrogen bond between Guanine and Cytosine.
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$(I)$ Biodiversity throughout the world shows uneven distribution.
$(II)$ According to latitudinal gradient there is no major difference in biodiversity.
$(III)$ Species diversity increases as we move away from equator towards the poles.
$(IV)$ Biodiversity increases as we move from temperate to tropical region.
Reason : This happens because of the presence of $hCG$ in the blood of females.
$II.$ The population growth rate $r$ is inversely related to generation time
$III.$ The housefly, which has a short life span and produces a large number of eggs, could be considered as a ' $K$ ' selected species
$IV.$ Under a particular set of selection pressures, organisms evolve towards the most efficient reproductive strategies
$V.$ Life history traits of organisms have evolved in relation to the constraints imposed by biotic and abiotic factors in their habitat Select the combination of correct statements