Biology Chapter on Immunology and Genetic Techniques
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Questions and Answers

Which lymphocytes are responsible for acquired immunity?

  • Cytotoxic T cells and mast cells
  • Natural killer cells and phagocytes
  • B lymphocytes and T lymphocytes (correct)
  • Helper T cells and macrophages

    • What is the primary role of lymph nodes in the immune system?

  • Production of hormones
  • Storage of red blood cells
  • Filtration of lymph and activation of immune responses (correct)
  • Synthesis of antibodies

    • What is a key characteristic of adaptive radiation?

  • Development of physical traits for survival
  • Species evolving rapidly in response to environmental changes
  • Evolution of various species from a common ancestor (correct)
  • Genetic mutation leading to instant adaptation

    • Which method is utilized to separate DNA fragments based on size?

    <p>Gel electrophoresis (B)</p> Signup and view all the answers

    Which of the following accurately describes a step in transcription?

    <p>Only one DNA strand is utilized as a template (A)</p> Signup and view all the answers

    Which type of immunity is characterized by memory and long-lasting protection following exposure to a pathogen?

    <p>Adaptive immunity (D)</p> Signup and view all the answers

    What happens if the RNA polymerase is not available during transcription?

    <p>Transcription cannot occur (B)</p> Signup and view all the answers

    What is an example of a trait resulting from adaptive radiation in an isolated environment?

    <p>Different species of Darwin's finches on the Galapagos Islands (D)</p> Signup and view all the answers

    What is the primary function of the hormone hCG during pregnancy?

    <p>Supports embryo implantation (B)</p> Signup and view all the answers

    Which of the following assisted reproductive technologies involves directly injecting sperm into the cytoplasm of an egg?

    <p>Intra-Cytoplasmic Sperm Injection (B)</p> Signup and view all the answers

    Which restriction enzyme recognizes the sequence 5l -GGATCC- 3l and creates sticky ends?

    <p>BamHI (A)</p> Signup and view all the answers

    What is the characteristic feature of sticky ends produced by restriction enzymes?

    <p>They are short single-stranded overhangs that can hybridize. (C)</p> Signup and view all the answers

    What is a common reason for infertility in women?

    <p>Hormonal imbalances (C)</p> Signup and view all the answers

    What would be a potential method to differentiate recombinant plasmids from non-recombinant ones in E. coli?

    <p>Antibiotic resistance assay (C)</p> Signup and view all the answers

    Which of the following hormones is involved in preparing the uterus for childbirth?

    <p>Relaxin (B)</p> Signup and view all the answers

    What are the terms for the biomass available for consumption to heterotrophs and the rate of formation of new organic matter by consumers?

    <p>Gross primary productivity and secondary productivity respectively (D)</p> Signup and view all the answers

    Which options indicate the incorrectly placed traits in pea plants studied by Mendel?

    <p>(i), (ii) and (iii) only (A)</p> Signup and view all the answers

    What was Ernst Chain and Howard Florey's key contribution to science?

    <p>Establishing the potential of penicillin as an effective antibiotic (B)</p> Signup and view all the answers

    Which of the following is not a recognized effect of smoking tobacco?

    <p>None of these (C)</p> Signup and view all the answers

    What does the shape of the given age pyramids reflect about the growth status of the related population?

    <p>Expanding, Declining (B)</p> Signup and view all the answers

    What experimental phenomenon was demonstrated by Meselson and Stahl?

    <p>Semiconservative replication of DNA (D)</p> Signup and view all the answers

    Which of these chemicals is not associated with the effects of tobacco smoking?

    <p>Nitrous oxide (D)</p> Signup and view all the answers

    Which of the following options best describes the role of secondary productivity in an ecosystem?

    <p>Consumption and utilization of produced biomass (D)</p> Signup and view all the answers

    What does an age pyramid with a broad base indicate?

    <p>High percentage of young individuals (A)</p> Signup and view all the answers

    Which principle states that two closely related species cannot coexist in the same niche for extended periods?

    <p>Competitive exclusion principle (A)</p> Signup and view all the answers

    What are the primary producers in the deep-sea hydrothermal vent ecosystem?

    <p>Chemosynthetic bacteria (B)</p> Signup and view all the answers

    What is the correct matching for the Law of Independent Assortment?

    <p>ABO blood group in man - Multiple allelism (C)</p> Signup and view all the answers

    From which organism is statin, a cholesterol-lowering agent, commercially obtained?

    <p>Monascus purpureus (B)</p> Signup and view all the answers

    What is the process called where decomposer bacteria in sewage treatment are partially recycled into the process?

    <p>Activated sludge treatment (C)</p> Signup and view all the answers

    What palindromic sequence corresponds to the DNA segment 5' ATTGCAAT 3'?

    <p>3' TAACGTTA 5' (C)</p> Signup and view all the answers

    Which of the following best describes the Dihybrid test cross ratio?

    <p>9:3:3:1 (C)</p> Signup and view all the answers

    Which of the following explains the significance of sporopollenin in plants?

    <p>It offers resistance to desiccation and degradation. (C)</p> Signup and view all the answers

    What is the primary reason for conducting drug tests on athletes before sports events?

    <p>To prevent the use of performance-enhancing drugs. (B)</p> Signup and view all the answers

    Which statement best describes the role of predation in a community?

    <p>It helps maintain the balance of ecosystems. (B)</p> Signup and view all the answers

    Which characteristic is unique to a population that does not apply to an individual organism?

    <p>Age distribution. (A)</p> Signup and view all the answers

    What is a test cross, and when is it typically used by geneticists?

    <p>A cross between a heterozygous individual and a homozygous recessive individual to determine genotype. (A)</p> Signup and view all the answers

    What conclusion can be drawn from a Punnett square showing a cross between pea plants with contrasting traits that results in 50% parental characters?

    <p>The traits follow a simple Mendelian inheritance pattern. (C)</p> Signup and view all the answers

    Which hormone is primarily responsible for the growth of ovarian follicles in the human ovary?

    <p>Follicle-stimulating hormone (FSH). (B)</p> Signup and view all the answers

    What is the expected outcome when two different traits are crossed with each showing a complete dominance?

    <p>The resulting offspring will display only one trait. (C)</p> Signup and view all the answers

    What are the transcriptional products of RNA polymerase III?

    <p>rRNA (A), tRNA (C)</p> Signup and view all the answers

    Which statement best differentiates between capping and tailing?

    <p>Capping occurs at the 5' end, while tailing occurs at the 3' end. (A)</p> Signup and view all the answers

    What is the role of the thymus as a lymphoid organ?

    <p>Development of T-cells (A)</p> Signup and view all the answers

    What does Gause’s competitive exclusion principle state?

    <p>No two species can compete for the exact resources indefinitely. (B)</p> Signup and view all the answers

    What is the primary cause of ADA deficiency in humans?

    <p>Recessive genetic disorder (D)</p> Signup and view all the answers

    In terms of biological oxygen demand (BOD), which sample is likely to contain the highest level of organic pollution?

    <p>Untreated sewage (D)</p> Signup and view all the answers

    What conclusion can be drawn from the operon system in Escherichia coli?

    <p>Operon regulation can be linked to environmental changes. (B)</p> Signup and view all the answers

    What would mostly happen in the presence of X in Case II of the operon system?

    <p>The repressor will remain inactive. (C)</p> Signup and view all the answers

    Study Notes

    Sample Papers

    • CBSE Exam 2025
    • 20 Sets
    • Class 12th
    • Biology
    • Marking scheme links at end of PDF

    Instructions

    • All questions compulsory
    • 5 sections and 33 questions
    • Section A: 16 questions of 1 mark each
    • Section B: 5 questions of 2 marks each
    • Section C: 7 questions of 3 marks each
    • Section D: 2 case-based questions of 4 marks each
    • Section E: 3 questions of 5 marks each
    • No overall choice, internal choices provided in some questions
    • Neat and properly labeled diagrams required where necessary

    Disclaimer

    • Papers based on CBSE SQP released by a private organization for student practice.
    • CBSE not related to these papers.
    • Papers not for main exam but for practice only.

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    CBSE Biology Class 12 Sample Paper 01 PDF

    Description

    Test your knowledge on the immune system, adaptive radiation, and DNA separation techniques in this engaging quiz. Questions cover lymphocytes, lymph nodes, transcription, and assisted reproductive technologies. Perfect for students studying biology at an advanced level.

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