Which process leads to the formation of humus?
Humification is the process by which partially decomposed organic matter accumulates as humus in the soil.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Decomposition - Process and Factors
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Which of the following describes a grazing food chain?
A grazing food chain begins with living producers such as plants or phytoplankton, which are consumed by herbivores.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Decomposition - Process and Factors
Which of the following statements about primary productivity is correct?
Primary productivity varies across ecosystems and is influenced by factors such as sunlight, nutrient availability, and temperature.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
Which of the following is an example of somatic hybridization?
Pomato is produced by fusing protoplasts of tomato and potato through somatic hybridization.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Nutritional Enhancement - Golden Rice and GM Crops
Which of the following is correct about Golden Rice?
Golden Rice is genetically modified to produce beta-carotene, which is converted to vitamin A in the body_x000D_ to address vitamin A deficiency.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Nutritional Enhancement - Golden Rice and GM Crops
Which enzyme is used to synthesize cDNA from an mRNA template?
Reverse transcriptase is used to synthesize complementary DNA (cDNA) from an mRNA template.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Nutritional Enhancement - Golden Rice and GM Crops
What is the primary aim of using RNA interference in genetically modified crops?
RNA interference is used to silence specific genes in pests, preventing them from causing harm to the_x000D_ crops.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Nutritional Enhancement - Golden Rice and GM Crops
Which genetically modified crop provides resistance to bollworm insects?
Bacillus thuringiensis (Bt) cotton is genetically modified to provide resistance against bollworm_x000D_ insects.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Nutritional Enhancement - Golden Rice and GM Crops
What is the major ethical concern associated with genetically modified organisms?
Genetic modification may have unpredictable ecological consequences, raising ethical concerns.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Nutritional Enhancement - Golden Rice and GM Crops
Which of the following statements about polymerase chain reaction (PCR) is correct?
PCR is a widely used technique to amplify specific DNA sequences using primers and thermostable DNA polymerase.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Polymerase Chain Reaction - PCR and Applications
Which of the following statements is incorrect?
Darwin did not propose the origin of life from non-living organic molecules; this was suggested by Oparin and Haldane.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Origin of Life - Theories Miller Urey Experiment
Which of the following statements is correct?
Homologous organs share a similar structure due to common ancestry but perform different functions in various organisms.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Origin of Life - Theories Miller Urey Experiment