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Which graph shows the effect of temperature on the rate of photosynthesis of the aquatic plants such as Elodea?

A
B
C
D

Three salt solutions are given as:
X : Potassium sulphate solution
Y : Sodium carbonate solution
Z : Ammonium sulphate solution
Which of the following statements is incorrect regarding these salt solutions?

AX will have same effect on red litmus paper as the common salt solution.
BY will have same effect on turmeric paper as the milk of magnesia.
CAmmonium sulphate will have same effect on blue litmus paper as the lemon juice.
DNone of these

Select the tool that measures in the unit of kilogram.

A
B
C
D

Match the columns and select the correct option.

Refer to the given Venn diagram and select the incorrect statement regarding X, Y and Z.


A X could be an incurable disease that damages immune system of the infected person.
B Disease Y could be effectively treated by antibiotics.
C Z could be a disease in which blood platelet count of a person goes down significantly.
D Both X and Y could be communicable diseases, of which Y could get cured on its own.

The given graph shows the changes in level of pollution in an area over a time period.

Which of the following can be inferred from the given graph?

AAt point P a lot of forest land was cleared for human consumption whereas at point Q large scale afforestation was done.
BAt point R a new factory was set up in the area.
CPeople cut down the use of fossil fuels in the interval S - T as compared to its earlier usage.
DIntervals R - S and T - U indicate activities like use of bioinsecticides and biopesticides instead of chemicals in farming, use of public transport instead of private transport, etc.

It is possible to make a meaningful word with the second, the third, the ninth, the tenth, the thirteenth, the fourteenth and the eighteenth letters of the word COUNTERINTELLIGENCE, using each letter only once, except the second letter, which should be used twice, which of the following will be the third letter of that word? If no such word can be formed give 'X' as the answer, and if only two such words can be made give answer 'Y'. And if more than two such words can be formed give answer 'Z'.

A C
B X
C Y
D Z

Humans inherit colour of their eyes from their parents. Brown-eyed couple has three blue-eyed children. Which of the following statements gives correct explanation of this situation?
(i) Each parent has an allele for brown eyes and an allele for blue eyes.
(ii) The allele for blue eyes is recessive.
(iii) The probability that their next child will have blue eyes is 0.75.
(iv) The probability that their next child will have brown eyes is 0.5.

A (i) and (ii) only
B (i) and (iii) only
C (ii) and (iv) only
D (iii) and (iv) only

A scientist conducted a study on four different species of organisms P, Q, R and S in a terrestrial food chain. He estimated the total number of individuals in the population of each species and the average biomass of each individual.

Which of the following shows the correct relation of these species in a food chain?

AS → R → P → Q
BR → S → Q → P
CQ → P → R → S
DP → Q → R → S

Match column-I with column-II and select the correct option from the given codes.