Which of the following represents a possible food chain in a pound :

$\begin{array}{ccc}\text{Primary}& \text{Primary}& \text{Secondary}\\ \text{Producers}& \text{consumers}& \text{consumers}\\ \text{(a) green algae}& \text{fish}& \text{mosquito larvae}\\ \text{(b) fish}& \text{green algae}& \text{mosquito larvae}\\ \text{(c) mosquito larvae}& \text{fish}& \text{green algae}\\ \text{(d) green algae}& \text{mosquito larvae}& \text{fish}\end{array}$

Q. Which of the following represents a possible food chain found in a pond :

Primary producers	Primary consumers	Secondary consumers
(a) green algae	fish	mosquito larvae
(b) fish	green algae	mosquito larvae
(c) mosquito larvae	fish	green algae
(d) green algae	mosquito larvae	fish

Q.

Which one is incorrectly matched?

$\begin{array}{ccc}& \text{Vitamins}& \text{Deficiency Disease}\\ \text{A.}& \text{Vitamin C}& \text{Anaemia}\\ \text{B.}& \text{Vitamin D}& \text{Rickets}\\ \text{C.}& \text{Vitamin A}& \text{Night Blindness}\\ \text{D.}& \text{Vitamin K}& \text{Beri-beri}\\ \text{E.}& \text{Vitamin B}& \text{Haemorrhage}\end{array}$

Q. Calculate the unuseful energy (in $\text{cal}$) left after the completion of the following food chain, if $3,600\text{cal}$ is the gross primary production (GPP):

$\text{Algae}\to \text{Fish}\to \text{Hawk}$

Q. Match the following
$\begin{array}{cc}\text{Compound}& \text{Boiling point}\\ \text{(A) butan-1-ol}& \text{(P)}108{}^{\circ }C\\ \text{(B) butan-2-ol}& \text{(Q)}117{}^{\circ }C\\ \text{(C) 2-methyl propan-1-ol}& \text{(R)}82{}^{\circ }C\\ \text{(D) 2-methyl propan-2-ol}& \text{(S)}100{}^{\circ }C\end{array}$

Q.

Which one is incorrectly matched?

$\begin{array}{ccc}& \text{Vitamins}& \text{Deficiency Disease}\\ \text{A.}& \text{Vitamin C}& \text{Anaemia}\\ \text{B.}& \text{Vitamin D}& \text{Rickets}\\ \text{C.}& \text{Vitamin A}& \text{Night Blindness}\\ \text{D.}& \text{Vitamin K}& \text{Beri-beri}\\ \text{E.}& \text{Vitamin B3}& \text{Pellagra}\end{array}$