Biology 12 past paper 2024

Rapid melting of ice caps and glaciers is due to:

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Describe the structure of rib cage. Briefly explain the advantages of having some ribs that are not attached directly to sternum.

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Pressure filtration in kidney specifically occurs in:

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What is the function of nephron? How is the rate of blood filtration within the Bowman's capsule affected if blood pressure in the afferent arteriole is decreased?

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The lungs are covered by a doubled layer of thin membranous sacs called:

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People with type I diabetes do not produce any insulin. What effect would it have on cells and metabolism if left untreated?

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Explain Habituation, Conditioning, Latent learning and insight learning by giving examples from human behaviours.

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Identify and describe the three different processes involved in embryonic development.

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How is the information present in DNA used for the synthesis of RNA? Explain in detail. Also list down the post transcriptional modifications of mRNA.

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Which of the following neurotransmitters functions both as a neurotransmitter and a hormone?

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What are the two methods used for gene therapy? Explain the role of successful gene therapy for cystic fibrosis.

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After consuming banana, which hormone would be expected to increase in body?

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What are chromosomes and genes? How are they related?

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Why is the anterior lobe of the pituitary gland called the master gland? Enlist the hormones produced by the anterior lobe. Write down the functions of each hormone as well.

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Which of the following hormones would bind to receptors located on the inside of a cell?

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In Griffith's experiment, do you think the heat treatment that killed the bacteria also inactivated the bacterial DNA? Why or why not?

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Describe the transport of oxygen and carbon dioxide through blood in humans.

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Differentiate between convergent and divergent evolution on the basis of inheritance of homologous and analogous structure.

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Explain in detail the Sliding filament model of muscle contraction.

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Which of the following will be hemophilic?

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Why is nasal breathing generally considered superior to mouth breathing? Also write down the sequence of muscle contractions that take place during inhalation and exhalation.

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In humans sex determination depends upon the nature of:

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Compare Klinefelter syndrome with Turner's syndrome with reference to Karyotype, Cause and Symptoms.

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Which of the following shows evidences for evolution through molecular biology?

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FSH and LH get their names from events of the female reproductive cycle, but they also function in males. How are their functions similar in females and males?

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The cause of acid rain is:

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Briefly explain Darwin's theory of natural selection.

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The enzyme used to isolate gene from DNA is:

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Differentiate between: **A.** Ammonification and denitrification **B.** Xerarch and hydarch succession

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The agent which separates the two strands of DNA in PCR (polymerase chain reaction) is:

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Briefly explain Integrated disease management.

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Which of the following hormones is secreted if blastocyst is successfully implanted in the wall of uterus?

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Briefly describe the procedure for the construction of Genomic library.

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The construction of intricate web by spider is an example of:

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Compare and contrast the sympathetic and parasympathetic nervous systems.

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Phosphodiester bond is:

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Briefly describe the following terms: **A.** Genetic marker **B.** Genomics **C.** Genome maps

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Local anaesthesia blocks the opening of sodium channels in the nerve cells. How would this affect the transmission of pain impulses? Explain briefly.

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Why biomass present at one trophic level of an ecosystem decreases at higher trophic level? Explain briefly.

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How is it possible for a child to have a blood group O if the parents have blood group A and B?

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Write down any three applications of DNA analysis.

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What is meant by home gardening? List at least four benefits of home gardening.

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State Mendel's law of segregation. Make a cross between round seed and wrinkled seed pea plant.

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What are the three major steps in sequencing of DNA?

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What is epistasis? How is it different from dominance?

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Briefly explain characteristics of Growth, Distribution and Carrying capacity of a population.

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Briefly explain the role of vaccination as an effective method of preventing infectious diseases.

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A plant with yellow flower was crossed with a plant with red flowers. The $F_1$ progeny obtained had orange flowers. What is the inheritance pattern? Explain briefly.

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