Which one of the following statements is incorrect?
- AThe residual air in lungs slightly decreases the efficiency of respiration in mammals
- BThe presence of non-respiratory air sacs,increases the efficiency of respiration in birds
- CIn insects,circulating body fluids serve to efficiently distribute oxygen to tissues
- DThe principle of countercurrent flow facilitates efficient respiration in gills of fishes
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The point $(3,2)$ undergoes the following three transformations in the order given:
$(i)$ Reflection about the line $y=x$.
(ii) Translation by the distance $1$ unit in the positive direction of $x$-axis.
(iii) Rotation by an angle $\frac{\pi}{4}$ about the origin in the anti-clockwise direction.
Then,the final position of the point is:
$(i)$ Reflection about the line $y=x$.
(ii) Translation by the distance $1$ unit in the positive direction of $x$-axis.
(iii) Rotation by an angle $\frac{\pi}{4}$ about the origin in the anti-clockwise direction.
Then,the final position of the point is:
Which of the following hormones is a derivative of an amino acid?
$CaCl_2$ and $Ca(OCl)_2$ are components of:
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The acute angle between the two lines whose direction ratios $(l, m, n)$ satisfy the equations $l+m-n=0$ and $l^2+m^2-n^2=0$ is
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