(a) Name the nematode that infests and damages tobacco roots.
(b) How are transgenic tobacco plants produced to solve this problem ?
(c) what was the first product of ancient biotechnology ?
(d) Which enzymes is used for removal of proteinaceous strains ?
(e) What are petro pants ?

(a) Name the nematode that infects and damages tobacco roots. (b) How are transgenic tobacco plants producced to solve this problem ?

Observe the diagram and answer the following . (a) Which group of plants exhibit these two type cells ? (b) What is the first product of C_(4) cycle ? ( c) Which enzyme is there is bundle sheath cells and mesophyll cells ?

Observe the given bar graph carefully and answer the questions that follow. (a) What information does the bar graph depict? (b) How many motor bikes were produced in the first three months? (c) Calculate the increase in production in May over the production in January. (d) In which month the production was minimum and what was it? (e) Calculate the average (mean) production of bikes in 6 months.

Read statements a-d. Which two of them have mistakes (a) First transgenic buffalo Roise produced milk which was human alpha-lactalbumin enriched (b) Restriction enzymes are used in isolation of DNA from other macromolecules (c) Downstream processing is one of the steps of rDNA technology (d) Disarmed pathogen vectors are also used in transfer of rDNA into the host

No chemical reaction takes place when granules of a rusty brown solid A re mixed with the powder of another solid B. however, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. it was observed that the reaction is highly exothermic. (a) What could the solids A and B be? (b) What are the products C and D most likely to be? (c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate tthe heat change which takes place. (d) What is the special name of such a reaction? State one use of such a reaction. (e) Name any two types of chemical reaction under which the above reaction can be classified.

The chemical substance P is made and secreted by the meristematic tissue at the tip of stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards a source of light. The same chemical substance P has on opposite effect on the root of a plant. It causes the root of a plant to bend away from the source of light in a process called R. (a) What is the chemical substance P? (b) State whether P prefers to remains in the sunlit side of a stem or in shade. (c) What is the effect of substance P on the rate of growth of (i) a root, and (ii) a stem? (d) What is the name of process (i) Q, and (ii) R? (e) What is the general name of chemical substances like P? Name another substance which belongs to this class of chemical substances.