In the following two exercises, choose the correct answer from among the given ones: The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig 8.12) (i) a, (ii) b,(iii)c, (iv) 0.

For the following question, choose the correct answer from the codes (a), (b), (c) and (d) defined as follows: Statement I is true, Statement II is also true; Statement II is the correct explanation of Statement I. Statement I is true, Statement II is also true; Statement II is not the correct explanation of Statement I. Statement I is true; Statement II is false Statement I is false; Statement II is true. Let a , b , c , p , q be the real numbers. Suppose alpha,beta are the roots of the equation x^2+2p x+q=0 and alpha,beta/2 are the roots of the equation a x^2+2b x+c=0, where beta^2 !in {-1,0,1}dot Statement I (p^2-q)(b^2-a c)geq0 and Statement II b !in p a or c !in q adot

Study the following statements regarding food chains and select the correct ones. (i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation. (ii) Removal of most of the carnivores resulted in an increased population of deers. (iii) The lenght of food chains is generally limited to 3-4 trophic levels due to energy loss. (iv) The lenght of food chains may vary from 2 to 8 trophic levels. A) i and ii B) ii and iii C) i and iii D) iii and iv

Read the following statements and select the correct ones. (i) Electrophoresis is a technique used for the separation of molecules based on their size and charge. (ii) Plasmids are extra-chromosomal, self-replicating, usually circular, double stranded DNA molecules found naturally in many bacteria and also in some yeast,. (iii) It is not advisable to use an exonuclease enzyme while producing a recombinant DNA molecule. (iv) In EcoRl, the roman numberal I indicates that it was the first enzyme isolated from E.coli A) (i) and (ii) B) (iii) and (iv) C) (i),(ii) and (iv) D) (i),(ii),(iii) and (iv)

Read the following statements and select the incorrect ones. (i) When the transformed cells on agar plates containing ampicillin are spread, both transformed and untransformed cells will grow. (ii) Restriction enzymes are used in isolation and separation of DNA from other macromolecules. (iii) Downstream processing is one of the steps of rDNA technology. (iv) Disarmed pathogen vectors are also used in transfer of rDNA into the host. a) (i) and (iii) b) (iii) and (iv) c) (i) and (iii) d) (i) and (ii)

Read the following statements and select the correct ones. (i) A given species may occupy more than one trophic level in the same ecosystem at the same time. (ii) Productivity of an aquatic ecosystem is less than that of a terrestrial ecosystem. (iii) Producers constitute the first trophic level of a detritus food chain. A) i and ii B) ii and iii C) i and iii D) i, ii and iii

Choose the correct statements from the following for the given situation. The dielectric can be inserted into the plates of a capacitor when (i) The capacitor is connected to the battery (ii) the capacitor is disconnected from the battery (iii) the capacitor is discharging and plates are removed (iv) the capacitor is charging without the plates

Match column I with column II with respect to the nomenclature of restriction enzyme EcoRl and select the correct answer from the given codes. {:(Column I,Column II),(A.E,(i)1^(st)"in order of identification"),(B.co,(ii)"Name of genus"),(C.R,(iii)"Name of species"),(D.l,(iv)"Name of strain"):} (a) A-(iii),B-(i),C-(ii),D-(iv) (b) A-(ii),B-(i),C-(iii),D-(iv) (c) A-(i),B-(ii),C-(iii),D-(iv) (d) A-(ii),B-(iii),C-(iv),D-(i)

Match the terms given in column I with their definitions in column II and select the correct answer from codes given below. {:(Column I,Column II),(A."Transformation",(i)"Sequences cut by restriction enzymes"),(B."Recognition site",(ii)"Process by which DNA fragments are separated based on their size"),(C."Gel electrophoresis",(iii)"Plasmid DNA that has incorporated human DNA"),(D."Recombinant DNA",(iv)"Process by which bacteria take up pieces of DNA from the environment"):}

Match the following and choose the correct option from below. A.Cuticle -(i). Guard cells B. Bulliform cells -(ii). Single layer C. Stomata -(iii). Waxy layer D. Epidermis-(iv). Empty colourless cell Options