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If CO2 is absent in atmosphere of earth then

a) Temperature will decrease b) Temperature will increase c) Plants will flourish well d) No effect Answer: a) Explanation: There... View Article

Verhulst-Pearl logistic growth is described by the equation dN/dt= rN [1-N/K], where ‘r’ and ‘K’ represent,

a) r= intrinsic rate of natural decrease, K= carrying capacity b) r= intrinsic rate of natural increase, K= carrying capacity... View Article

Which of the following is a freshwater indicator organism?

a) Daphnia b) Tubifex c) Sludge worm d) All of the above. Answer: a) Explanation: Daphnias are small planktonic crustaceans,... View Article

Nucleic acid segment which is used to find the position of a gene and it forms a hybrid with this gene would be

a) Clone b) Vector c) Probe d) Retrovirus Answer: c) Explanation: A probe is a nucleotide sequence of varied lengths(from... View Article

The lining of intestinal wall from outside to inside is made up of

a) Longitudinal muscles → circular muscles → submucosa → mucosa b) Circular muscles → longitudinal muscles → submucosa → mucosa... View Article

Which of the following is a preservative part of plants?

a) Leaves b) Flower c) Seed d) All of the above Answer: d) Explanation: Seeds and leaves should be collected... View Article

E.coli is used in the production of

a) Rifampicin b) LH c) Interferon d) Ecdysone Answer: c) Explanation: Interferons are a group of signalling molecules that are... View Article

What is the maximum number of action potential that a SAN can generate?

a) 20-30/min b) 70-75/min c) 40-60/min d) 50-60/min Answer: b) Explanation: The sino-atrial node(SAN) is a group of cells located... View Article

If x : y = 3:5, find the ratio 3x+4y:8x+5y

Solution: Let x = 3k and y = 5k 3x+4y:8x+5y = (9k+20k)/(24k+25k) = 29k/49k = 29/49 Hence the required ratio... View Article

Factors of 251

Solution: A prime number will have only 2 factors. It will be divisible by 1 and the same number. 251... View Article

Jane can type 60 words per minute and it takes her 35 minutes to write a letter. John can type 50 words per minute. How long would it take him to write the same letter?

Solution: Number of words Jane can type in one minute = 60 words She took 35 minutes to write a... View Article

Find the value of x for which the equations f(x) = 3x² -1 and g(x) = 3 + x are equal.

Solution: Given f(x) = 3x2 -1 g(x) = 3 + x f(x) = g(x) => 3x2-1 = 3+x => 3x2-x-4... View Article

The sum of all the prime factors of the number 1890 is _____

Solution: 1890 = 2×3×3×3×5×7 = 2×33×5×7 The prime factors are 2,3 5, and 7. Sum of the prime factors =... View Article

Bisectors of interior ∠B and exterior ∠ACD of a ΔABC intersect at the point T. Prove that ∠BTC = ½ ∠BAC

Solution: ∠TBC = ½ ∠B ..(i) (Bisector of ∠B) ∠TCD = ½ ∠ACD ..(ii) In triangle ABC, ∠A+∠B = ∠ACD... View Article

Three consecutive integers are such that when they are taken in increasing order and multiplied by 2, 3 and 4 respectively, they add up to 74. Find these numbers.

Solution: Let the three consecutive integers be x-1, x, x+1. => 2(x-1) + 3x + 4(x+1) = 74 => 2x... View Article

If sec a + tan a = x, then sec a =

(a) (x2+1)/2x (b) (x2+1)/x (c) (x2-1)/2x (d) (x2-1)/x Solution: Given sec a + tan a = x ..(i) Multiply and... View Article

In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant approximately. What percentage of the selling price is the profit?

(a) 30% (b) 100% (c) 70% (d) 250% Solution: Let the cost price be Rs.100. Given that the profit is... View Article

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