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The primary treatment of waste water involved the removal of:
(1) dissolved impurities
(2) stable substances
(3) toxic substances
(4) harmful bacteria.

In the logistic growth equation given below, the carrying capacity is represented by:
        dN/dT = rN(K-N)/K
1. N
2. r
3. K
4. K-N/K

Gause's principle of competitive exclusion is, essentially:
1. the more abundant species will exclude the less abundant species through competition
2. competition for the same resources excludes species having different lifestyles
3. no two species can occupy the same niche indefinitely when resources are limited
4. larger organisms exclude smaller ones through competition as in the case of large trees controlling underbush.

Identify the incorrect statement regarding Multiple Ovulation Embryo Transfer Technology (MOET):
(1) FSH like hormone or PMSG [pregnant mare serum gonadotropin] are used to induce super-ovulation [6-8 eggs rather thanone per cycle] and Prostagladins are used to regulate the duration of cycle.
(2) Fresh embryos can be stored at 37$°$C for 6-8 hours without much harm but it is recommended that the embryos are inserted into the recipient cow or frozen as soon as possible. The embryos can be stored for ever in liquid nitrogen.
(3) The animal is either mated with an elite bull or artificially iseminated and the fertilized eggs at 8-32 cells stages, are recovered non-surgically and transfered to genetic mothers.
(4) The embryos are transferred to a recipient cow whose oestrous cycle is at the correct receptive stage.

The relation between species richness and area for a wide variety of taxa on a logarithmic scale is a:
1. rectangular hyperbola
2. straight line
3. sigmoid curve
4. circular circle

The compound 'B' is

1.		2.
3.		4.

Consider the acidity of the following carboxylic acids
(i) PhCOOH
(ii) o-NO₂C₆H₄COOH
(iii) p-NO₂C₆H₄COOH
(iv)m-NO₂C₆H₄COOH
1. i>ii>iii>iv
2. ii>iv>iii>i
3. ii>iv>i>iii
4. ii>iii>iv>i

$\mathrm{Density} \left(\mathrm{\rho }\right) \mathrm{of} \mathrm{nucleus} \mathrm{depends\; on\; the\; mass\; number\; A\; as:}$
1.  $\mathrm{\rho } \propto \mathrm{A}$
2.  $\mathrm{\rho } \propto \frac{1}{\mathrm{A}}$
3.  $\mathrm{\rho } \propto {\mathrm{A}}^{\mathrm{o}}$
4.  $\mathrm{\rho } \propto {\mathrm{A}}^{1/3}$

Two waves of intensity ratio 9:1 interfere to produce fringes in a young's double-slit experiment, the ratio of  intensity at maxima  to the intensity at minima is
1.  4:1
2.  9:1
3.  81:1
4.  9:4