Category: VBQs for Class 12

Very Short Answer Type Questions Question. In case of an infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 percent. Judge, which kind of ART is suitable in this situation to form an embryo in the laboratory, without involving a donor ?Answer : Intra Cytoplasmic Sperm Injection(No marks for abbreviation—ICSI)  Question. Name any […]

Very Short Answer Type Question Question. Differentiate between spermatogenesis and spermiogenesis. Answer : S.No. Spermatogenesis Spermiogenesis (i) Production of sperms (by meiosis). Spermatids are transformed to spermatozoa. Question. When do the oogenesis and the spermatogenesis initiate in human females and males, respectively ? Answer : Oogenesis starts in female in their foetal stage while spermotogenesis in males starts at […]

Very Short Answer Type Questions Question. State the function of filiform apparatus found in mature embryo sac of an angiosperm.Answer : Filiform apparatus helps to guide the path of pollen tubes into synergid.  Question. Give an example of a plant that came to India as a contaminant and is a cause of pollen allergy.Answer : Parthenium […]

Very Short Answer Type Questions Question. Identify ‘A’ in the given diagram and state its function.  Answer : ‘A’—Adventitious budsFunction — Vegetative propagation  Question. Identify ‘A’ in the diagram and mention its function. Answer : ‘A’—OffsetFunction — Vegetative propagation  Question. Give an example each of a fungus which reproduces by :(i) budding(ii) conidia. Answer : Budding : Yeast (Saccharomyces)Conidia : Penicillium […]

Biology Class 12 Value Based Questions Chapter 1 Reproduction in Organisms Chapter 2 Sexual Reproduction in Flowering Plants Chapter 3 Human Reproduction Chapter 4 Reproductive Health Chapter 5 Principles of Inheritance and Variation Chapter 6 Molecular Basis of Inheritance Chapter 7 Evolution Chapter 8 Human Health and Diseases Chapter 9 Strategies for Enhancement in Food […]

Question. The radius of the sphere x2 + y2 + z2 = 12x + 4y + 3z is(a) 13/2(b) 13(c) 26(d) 52  Question. If a plane meets the coordinate axes at A, B and C such that the centroid of the triangle is (1, 2, 4), then the equation of the plane is(a) x + 2y + 4z = 12(b) […]

Question. A four-digit number is formed by the digits 1, 2, 3, 4 with no repetition. The probability that the number is odd, is(a) zero(b) 1/3(c) 1/4(d) None of these  Question. A manufacturer of cotter pins knows that 5% of his product is defective. He sells pins in boxes of 100 and guarantees that not more than one pin will […]

Question. If the normal to the curve y = f(x) at (3, 4) makes an angle 3π/4 p with the positive x-axis, then f ′(3) is equal to(a) 1(b) 3/4(c) –1(d) − 3/4    Question. The minimum area of the triangle formed by any tangent to the ellipse x2/a2+ y2/b2 = 1 with the coordinate axes is(a) a2 + b2(b) (a + b)2/2(c) […]

Question. If the area (in sq. units) of the region {(x, y) : y2 ≤ 4x, x + y ≤ 1, x ≥ 0, y ≥ 0} is a √2 + b, then a – b is equal to :(a) 10/3(b) 6(c) 8/3(d) − 2/3 Question. If the area (in sq. units) bounded by the parabola […]

Very Short Answer Type Questions Question. With the help of an example, define micro economics.Answer : Micro Economics is that branch of economics in which economic problems are studied at individual level e.g. the behaviour of consumer, firms, etc. Question. Define opportunity cost.Answer : For the selection of an opportunity, the sacrifice of next best alternative use is […]