Class XI & XII · Biology practice
Botany PYQs Check your understanding, bookmark questions and revisit your mistakes.
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408 questions in this collection · Page 37 of 41
Photosynthesis In Higher Plants
Photorespiration reaction catalyzed by RuBisCo is shown below:2 → 3-Phosphoglycerate + X
A Phosphoenolpyruvate B 2-Phosphoglycolate C Oxaloacetate D Malate
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During photorespiration, RuBisCo oxygenates RuBP to produce one molecule of 3-phosphoglycerate and one molecule of 2-phosphoglycolate.
Biotechnology And Its Applications
Match List-I with List-II:
List-I List-II A. Genetically modified organism I. Agrobacterium tumefaciens B. Thermostable DNA polymerase II. Bt cotton C. Ti plasmid III. Thermus aquaticus D. pBR322 IV. Escherichia coli
A A-II, B-I, C-IV, D-III B A-II, B-III, C-I, D-IV C A-I, B-IV, C-III, D-II D A-I, B-II, C-IV, D-III
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Bt cotton is a genetically modified organism. Taq DNA polymerase is obtained from Thermus aquaticus . Ti plasmid is from Agrobacterium tumefaciens , while pBR322 is an E. coli cloning vector.
Biotechnology And Its Applications
Exploring molecular, genetic and species-level diversity for products of economic importance is called:
A Bioprospecting B Biofortification C Biomagnification D Bioremediation
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Bioprospecting involves exploring biological diversity to identify commercially valuable genes, compounds or organisms.
Plant Growth And Development
Match List-I with List-II:
List-I (Growth Regulator) List-II (Function/Effect) A. 2,4-D I. Brewing industry B. GA3 II. Stimulation of stomatal closure C. Kinetin III. Herbicide D. ABA IV. Nutrient mobilisation
A A-I, B-II, C-IV, D-III B A-I, B-IV, C-III, D-II C A-IV, B-III, C-II, D-I D A-III, B-I, C-IV, D-II
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2,4-D is a herbicide, GA₃ is used in the brewing industry, kinetin promotes nutrient mobilisation, and ABA induces stomatal closure.
Morphology Of Flowering Plants
In racemose inflorescence,
A The growth is limited B Flowers are solitary C Flowers are borne in an acropetal succession D The main axis terminates in a flower
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In racemose inflorescence, the main axis continues to grow and younger flowers are produced towards the apex (acropetal succession).
Biomolecules
Alpha-helix is found in which level of protein structure?
A Secondary structure B Primary structure C Tertiary structure D Quaternary structure
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The α-helix is a common secondary structure of proteins stabilized by hydrogen bonds.
Photosynthesis In Higher Plants
The enzyme required for carboxylation in the Calvin cycle is:
A PEP carboxylase B RuBP carboxylase-oxygenase C Carboxypeptidase D Hexokinase
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RuBisCO catalyzes the carboxylation of RuBP, the first step of the Calvin cycle.
Sexual Reproduction In Flowering Plants
Arrange the following in the correct developmental sequence related to microsporogenesis:
A A, D, C, B B D, A, C, B C B, D, C, A D B, D, A, C
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Sporogenous tissue differentiates into pollen mother cells, which undergo meiosis to form microspore tetrads that later develop into pollen grains.
Biotechnology Principles And Processes
Which of the following statements are not true regarding restriction endonucleases?E. coli .
A C and D only B A and E only C D and E only D A and B only
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Restriction endonucleases are molecular scissors that recognize specific palindromic sequences. They do not always cut exactly at the centre of the recognition site, and they do not remove nucleotides from DNA ends; that is the function of exonucleases.
Molecular Basis Of Inheritance
In the lac operon, the z gene codes for:
A The repressor of lac operon B Transacetylase C Permease D Beta-galactosidase
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The lacZ gene encodes β-galactosidase, which hydrolyses lactose into glucose and galactose.
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