Two of the steps involved in producing nematode resistant tobacco plants based on the process of RNA is Are mentioned below. Write the missing steps in its proper sequence.

Write down the steps involved in the manufacture of HNO_3 by Ostwald process.

While doing a PCR,'denaturation' step is missed. What will be its effect on the process?

How did process of RNA interference help to control the nematode from infecting the roots of tobacco plants?

Tobacco plants resistant to a nematode have been developed by the introduction of DNA that produces (in the host cells):

Suggest four important steps to produce a disease resistant plant through conventional plant breeding technology.

An ore on heating in air produces sulphur dioxide. Which process would you suggest for its concentration? Describe briefly any two steps involved in the conversion of this concentrated ore into related metal.

What does PCR stand for? Write its principle and name the different steps involved in PCR.

Large quantity of sewage is generated every day in cities and towns, Which is treated in Sewage Treatment Plants (STPs) to make it less polluted. Given below is the flow diagram of one of the stages of STP. Observe the given flow diagram and answer the questions accordigly. Write the technical term used for the sediment formed. MEntion its significance.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons: (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? (b) What would have been the minimum number of ovules present in the ovary? (c) How many megaspore mother cells were involved? (d) What is the minimum number of microspore mother cells involved in the above case? (e) How many male gametes were involved in this case?