Question

10. The given graph shows changes in three components
X, Y and Z in a water body after point P (where fertiliser
run off from
crop
field took place).
Select the correct statement regarding X, Y and Z.
(A) X could be phosphate compounds whose
concentration gradually reduced downstream due to
their consumption by growing aquatic plants.
(B) Y could be nitrate compounds which initially
increased due to introduction of NPK fertilisers whereas Z
represents decomposer microbes whose number increased
in order to decompose these compounds.
X
(C) Y could be algae which multiplied rapidly due to
nutrient enrichment of water body whereas X could be
dissolved
oxygen which started reducing simultaneously
with the increase in decomposition activity of microbes
Z after death of algae.
(D) Y could be aquatic animals which initially increased
in number due to consumption of large amount of aquatic
plants X and then decreased gradually with the reduction
in plant population.
(Level-2)​

Answer 1

Answer:

$L.H.S :- Sin10. Sin30. Sin50. Sin70$

$\begin{gathered}= \cos(90 - 10) \sin(30) \cos(90 - 40) \cos(90 - 70) \\ = \cos(80) \: \frac{1}{2} \: \cos(40) \: \cos(20) \\ = \frac{1}{4 \sin(20) } \cos(8 0 ) \cos(40) . \: 2 \sin(20) \cos(20) \\ = \frac{1}{8 \sin(20) } \cos(80) 2. \cos(40) \sin(40) \\ = \frac{1}{16 \sin(20) } 2 \cos(80) \sin(80 ) \\ = \frac{1}{16 \sin(20) } \sin(160) \\ = \frac{1}{16 \sin(20) } \sin(180 - 20) \\ = \frac{1}{16 \sin(20) } \sin(20) \\ = \frac{1}{16} \: \: \: \: \: \: \: \: .........R.H.S\end{gathered}$

$=cos(90−10)sin(30)cos(90−40)cos(90−70)$

$=cos(80) 2/1$

$cos(40)cos(20)= 4sin(20)1$

$cos(80)cos(40).2sin(20)cos(20)= 8sin(20)1$

$cos(80)2.cos(40)sin(40)= 16sin(20)1$

$2cos(80)sin(80)= 16sin(20)1$

$sin(160)= 16sin(20)1$

$sin(180−20)= 16sin(20)1$

$sin(20)= 16/1$

.........R.H.S

Answer 2

Answer:

Michael Jeffrey Jordan (born February 17, 1963), also known by his initials MJ, is a former American professional basketball player and the principal owner of the Charlotte Hornets of the National Basketball Association (NBA). He played 15 seasons in the NBA, winning six championships with the Chicago Bulls.