Who coined the term virus?
Viruses are submicroscopic entities inhabiting host cells. In 1898, Martinus Beijerinck named the filtered infectious particle “virus”, during one of... View Article
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What is superficial placentation?
The gynoecium in superficial placentation is multicarpellary syncarpous having a great number of ovules that are borne on the walls... View Article
The energy required to break one bond in DNA is 10-20J. Express it in eV.
The energy needed to break one bond in DNA is 10-20J We know 1 eV=> 1.6 x 10-19 J 1... View Article
When two plants L and M were exposed to different light intensities and temperatures, they showed changes in their rates of photosynthesis, which have been represented in the following graph. The graph indicates that,
a) Plant L is a C3 plant for which the light saturation point is 100% of full sunlight . b)... View Article
Which structure{s) of proteins remains intact during the denaturation process?
a) Both secondary and tertiary structures b) Only primary structure c) Secondary structure only d) Tertiary structure only Answer: b)... View Article
Cataract blinds at least 120 million people globally every year. What is its main cause?
a) Gasoline fumes b) Heredity c) Ultraviolet radiations d) Unbalanced diet Answer: c) Ultraviolet radiations Explanation: UV rays from natural... View Article
If the temperature is increased above 35°C
a) Rate of decline of respiration will be earlier than that of photosynthesis b) Rate of decline of photosynthesis will... View Article
The space between the cotyledonary node and the radicle is called as
a) Hypocotyl b) Epicotyl c) Raphe d) Hilum Answer: a) Hypocotyl Explanation: Hypocotyl is the portion found below the cotyledon... View Article
What is the difference between ejaculation and insemination?
Ejaculation is the release of semen, containing sperm from the male reproductive tract as a result of orgasm, whereas insemination... View Article
How to draw viruses easily?
Here is a simplified structure to draw viruses easily. Viruses are small structures consisting of DNA or RNA as their... View Article
log (log i) equals
(a) log π/2 (b) log iπ/2 (c) log π/2 + iπ/2 (d) log π/2 – iπ/2 Solution: i = eiθ... View Article
72% of 25 students are interested in mathematics. How many students are not interested in mathematics.
Solution: Given that 72% of 25 students are interested in mathematics. (72/100)×25 = 18 Number of students who are not... View Article
Write the expanded form of the following numbers
(i) 2,79,404 (ii) 30,06,194 (iii) 28,06,196 (iv) 1,20,719 (v) 20,068 Solution: A number written as the sum of the place-values... View Article
Prime factorisation of 253.
Solution: We divide 253 by the smallest prime factor. We keep dividing until it gives a non-zero remainder. 253/11 =... View Article
Express 14/9 as mixed fraction.
Solution: To convert 14/9 to a mixed fraction, we divide 14 by 9. The quotient is 1. The remainder is... View Article
If a = 2i – 2j + 3k, b = 3 i- 2j + 4k are two vectors then dot product of vectors a and b will be
Solution: a = 2i – 2j + 3k b = 3i – 2j + 4k Dot product, a.b = a1a2... View Article
Rachana makes a cuboid of plasticine of sides 5cm, 2cm, 5cm. How many such cuboids will she need to form a cube?
Solution: Volume of cuboid = lbh = 5×2×5 = 50 cm3 LCM of 5,2,5 = 10 The least length of... View Article
Prime factorization of 232
Solution: We divide 232 by the smallest prime factor. We keep dividing until it gives a non-zero remainder. 232/2= 116... View Article
Given two points A = {2, 4} and B = {3, 6} in 2d plane. Euclidean distance between the points is
Solution: Given A = {2, 4} and B = {3, 6} The distance between two points is given by √((x2-x1)2... View Article
Convert 49 into binary number.
Solution: To convert decimal to binary we should divide the number successively by 2 until the quotient is 0. Keep... View Article
