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Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
Concept: Gametogenesis
Explain the effect on the characteristics of a river when urban sewage is discharged into it.
Concept: Biodiversity
Name any two biodiversity hot spots in India.
Concept: Loss of Biodiversity
Draw a diagram of the mature embryo sac of an angiospermic ovule and label any four parts in it.
Concept: Development of Female Gametophyte or Embryo Sac
Medically it is advised to all young mothers that breast-feeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.
Concept: Pregnancy and Embryonic Development
Explain menstrual cycle in human females.
Concept: Menstrual Cycle (Ovarian Cycle)
How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure?
Concept: Menstrual Cycle (Ovarian Cycle)
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
Concept: Sex Determination
Write the names of the following:
A 15 mya primate that was ape-like
Concept: Human Evolution
Write the names of the following:
A 2 mya primate that lived in East African grasslands
Concept: Human Evolution
With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?
Concept: Hardy Weinberg’s Principle
How do cytokine barriers provide innate immunity in humans?
Concept: Immunity
Name the source plant of heroin drug. How is it obtained from the plant?
Concept: Types and Effects of Psychoactive Drugs >> Effects of Drug and Alcohol Abuse
Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.
- Recommend two microbes that can enrich the soil with nitrogen.
- Why do leguminous crops not require such enrichment of the soil?
Concept: Microbes as Biofertilizers
Give an example of a bacterium, a fungus and an insect that are used as biocontrol agents.
Concept: Microbes as Biocontrol Agents
How has the development of bioreactor helped in biotechnology?
Concept: Principles of Processes of Biotechnology
Name the most commonly used bioreactor and describe its working.
Concept: Principles of Processes of Biotechnology
Explain the roles of the following with the help of an example each in recombinant DNA technology :
Restriction Enzymes
Concept: Tools of Recombinant DNA Technology >> Restriction Enzymes
Explain the roles of the following with the help of an example each in recombinant DNA technology :
Plasmids
Concept: Tools of Recombinant DNA Technology >> Competent Host (For Transformation with Recombinant DNA)
Represent diagrammatically three kinds of age-pyramids for human populations.
Concept: Population >> Population Attributes
