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State PSC Science & Technology — practice questions — page 5

Explore 311 free Science & Technology questions in State PSC Science. Open each question or exercise to read its content, reference answers and available explanation.

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Science & Technology questions and exercises with answers

Showing questions 121–150 of 311.

Spirulina, grown on waste water and molasses as food rich in protein, is a:Read the answer and worked solution →The capacity to generate a whole plant from any cell or explant is:Read the answer and worked solution →Virus-free plants can be obtained by culturing which part of an infected plant?Read the answer and worked solution →Catch the wheat varietiesRead the answer and worked solution →Pop the rice wordsRead the answer and worked solution →Run the varietiesRead the answer and worked solution →Slice the food production wordsRead the answer and worked solution →Animal or plantRead the answer and worked solution →Sort the crop diseasesRead the answer and worked solution →Type the numberRead the answer and worked solution →Food production bingoRead the answer and worked solution →The exploitation of which fuel made the industrial revolution possible?Read the answer and worked solution →Oxides of carbon, nitrogen and sulphur released by burning fossil fuels cause:Read the answer and worked solution →Hydro power plants convert which form of energy of water into electricity?Read the answer and worked solution →About what fraction of India's energy requirement is met by hydro power plants?Read the answer and worked solution →Vegetation submerged in dam reservoirs rots anaerobically and releases which greenhouse gas?Read the answer and worked solution →Bio-gas is popularly called gobar-gas because its main starting material is:Read the answer and worked solution →In a bio-gas plant, the sealed chamber where cow-dung slurry decomposes without oxygen is the:Read the answer and worked solution →Bio-gas is an excellent fuel because it contains up to what share of methane?Read the answer and worked solution →Which country, called the country of winds, gets over 25 per cent of its electricity from windmills?Read the answer and worked solution →India ranks which position globally in harnessing wind energy for electricity?Read the answer and worked solution →India's largest wind energy farm, generating 380 MW, is near:Read the answer and worked solution →The Sun has been radiating energy at its present rate for nearly:Read the answer and worked solution →Solar cookers are painted black inside because a black surface:Read the answer and worked solution →Solar cells are mainly made from:Read the answer and worked solution →Tides are caused by the gravitational pull of mainly the:Read the answer and worked solution →In ocean thermal energy plants, warm surface water boils which volatile liquid to run the turbine?Read the answer and worked solution →Geothermal power plants operate in the USA and:Read the answer and worked solution →Nuclear fission splits a heavy nucleus when bombarded with:Read the answer and worked solution →Einstein first derived the mass-energy equation in:Read the answer and worked solution →

Worked practice questions

Spirulina, grown on waste water and molasses as food rich in protein, is a:

  1. Bakers yeast
  2. Blue-green alga
  3. Edible mushroom
  4. Soil bacterium
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Correct answer: B. Blue-green alga

1. It is a source of Single Cell Protein. 2. Spirulina is a blue-green alga. 3. Methylophilus methylotrophus is a protein bacterium. _Source: syllabus Biology, Chapter 9, Strategies for Enhancement in Food Production._

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The capacity to generate a whole plant from any cell or explant is:

  1. Somaclonal
  2. Hybrid vigour
  3. Totipotency
  4. Propagation
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Correct answer: C. Totipotency

1. Explants grow in sterile nutrient media. 2. This capacity is totipotency. 3. It enables micropropagation. _Source: syllabus Biology, Chapter 9, Strategies for Enhancement in Food Production._

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Virus-free plants can be obtained by culturing which part of an infected plant?

  1. Root tip
  2. Leaf blade
  3. Seed coat
  4. Meristem
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Correct answer: D. Meristem

1. Apical and axillary meristems stay virus free. 2. Culturing the meristem gives clean plants. 3. Banana, sugarcane and potato have been done. _Source: syllabus Biology, Chapter 9, Strategies for Enhancement in Food Production._

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