Biology and Human Welfare
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Human Health and Diseases
SubtopicHuman Health and Diseases under Biology and Human Welfare for Grade 12 ICSE.
Preview questions (no answers)
- 1.
Which of the following is classified as a primary lymphoid organ where immature lymphocytes differentiate into antigen-sensitive lymphocytes?
A.Spleen
B.Lymph nodes
C.Tonsils
D.Thymus
- 2.
The rejection of an organ transplant by a patient's body is primarily due to which type of immune response?
A.Humoral immune response
B.Cell-mediated immune response
C.Innate immune response
D.Passive immune response
- 3.
The infectious stage of that is injected into the human body by the bite of an infected female Anopheles mosquito is the:
A.Sporozoite
B.Merozoite
C.Gametocyte
D.Trophozoite
Download the worksheet for Biology and Human Welfare - Human Health and Diseases to practice offline. It includes additional chapter-level practice questions.
Strategies for Enhancement in Food Production
SubtopicStrategies for Enhancement in Food Production under Biology and Human Welfare for Grade 12 ICSE.
Preview questions (no answers)
- 1.
The microbial biomass of which organism is used as a rich source of protein (Single Cell Protein) due to its high rate of biomass production and growth?
A.Rhizobium
B.Methylophilus methylotrophus
C.Lactobacillus
D.Agrobacterium
- 2.
Which of the following is a common freshwater fish used in aquaculture?
A.Hilsa
B.Sardines
C.Mackerel
D.Catla
- 3.
Plants developed through tissue culture that are genetically identical to the original plant from which they were grown are termed as:
A.Somaclones
B.Somatic hybrids
C.Callus
D.Explants
Download the worksheet for Biology and Human Welfare - Strategies for Enhancement in Food Production to practice offline. It includes additional chapter-level practice questions.
Microbes in Human Welfare
SubtopicMicrobes in Human Welfare under Biology and Human Welfare for Grade 12 ICSE.
Preview questions (no answers)
- 1.
Identify the symbiotic nitrogen-fixing bacterium that forms nodules on the roots of leguminous plants.
A.Azotobacter
B.Azospirillum
C.Oscillatoria
D.Rhizobium
- 2.
Which yeast is commonly known as 'Baker's yeast' and is used in the fermentation of dough for bread making?
A.Saccharomyces cerevisiae
B.Saccharomyces ludwigii
C.Candida albicans
D.Aspergillus niger
- 3.
Biogas, produced by the anaerobic breakdown of organic matter, primarily consists of which mixture of gases?
A.Ethane, , and Nitrogen
B.Methane, Hydrogen, and
C.Methane, , and
D.Propane, , and
Download the worksheet for Biology and Human Welfare - Microbes in Human Welfare to practice offline. It includes additional chapter-level practice questions.