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.
The addictive property of tobacco is primarily due to the presence of:
A.Tar
B.Carbon monoxide
C.Nicotine
D.Resin
- 2.
Which of the following is a secondary lymphoid organ?
A.Bone marrow
B.Thymus
C.Lymph nodes
D.None of the above
- 3.
The injection given against a snake bite contains:
A.Antigens
B.Attenuated pathogens
C.Preformed antibodies
D.Antibiotics
- 4.
Which of the following is NOT a symptom of the common cold?
A.Nasal congestion
B.Sore throat
C.High fever with chills
D.Cough
- 5.
The property of 'Metastasis' is most associated with:
A.Benign tumors
B.Malignant tumors
C.Normal cell growth
D.Inflammatory response
- 6.
Which of the following is true regarding the transmission of HIV?
A.It is spread by shaking hands with an infected person.
B.It is spread by sharing food with an infected person.
C.It is spread through infected blood transfusion and sharing of needles.
D.It is spread by mosquito bites.
- 7.
Which of the following acts as a physiological barrier in the innate immune system?
A.Skin
B.Saliva in the mouth
C.Monocytes
D.Interferons
- 8.
Which component of cigarette smoke is primarily responsible for the reduction in the oxygen-carrying capacity of the blood?
A.Nicotine
B.Tar
C.Carbon Monoxide
D.Polycyclic Hydrocarbons
- 9.
Which of the following describes the 'Anamnestic Response' of the immune system?
A.The slow and weak response during the first encounter with a pathogen.
B.The rapid and highly intensified response upon subsequent encounter with the same pathogen.
C.The non-specific response provided by physical barriers like skin.
D.The passive immunity transferred from mother to fetus.
- 10.
The 'Withdrawal Syndrome' experienced by a drug addict upon sudden discontinuation of the drug is characterized by:
A.A state of extreme euphoria and energy.
B.Anxiety, shakiness, nausea, and sweating.
C.Improved cognitive function and memory.
D.Increased appetite and deep sleep.
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.
Management of animals for milk and its products for human consumption is called:
A.Poultry farming
B.Dairying
C.Fisheries
D.Apiculture
- 2.
Which of the following is a common poultry bird used for egg production?
A.Leghorn
B.Jersey
C.Murrah
D.Hissardale
- 3.
In tissue culture, which hormone ratio is generally used to promote shoot formation from a callus?
A.High Auxin to Low Cytokinin
B.Low Auxin to High Cytokinin
C.High Gibberellin to Low Auxin
D.Equal amounts of Ethylene and Auxin
- 4.
The variety of wheat is resistant to which of the following diseases?
A.White rust
B.Hill bunt
C.Bacterial blight
D.Tobacco mosaic
- 5.
Which of the following is a freshwater fish variety?
A.Hilsa
B.Sardines
C.Pomfrets
D.Catla
- 6.
The scientific name of the high sugar-producing sugarcane variety originally grown in South India is:
A.B.C.D. - 7.
Protoplasts are cells without a:
A.Nucleus
B.Plasma membrane
C.Cell wall
D.Cytoplasm
- 8.
Why is the selection of superior recombinants considered the most 'tedious' yet 'crucial' part of the breeding program?
A.Because it requires the use of expensive radioactive tracers.
B.Because it involves scientific evaluation of thousands of progeny to identify individuals with the desired combination of characters.
C.Because all progeny in the generation are usually identical and show no variation.
D.Because the selection must be done in a completely sterile laboratory environment.
- 9.
In 'Pisciculture', the practice of 'Induced Breeding' involves the injection of which extract into the fish to ensure spawning in captivity?
A.Thyroid extract
B.Pituitary extract
C.Adrenal extract
D.Pancreatic extract
- 10.
Which of the following was a major contributing factor to the 'Green Revolution' in India during the 1960s?
A.The use of traditional tall varieties of wheat with high fertilizers.
B.Introduction of semi-dwarf varieties of wheat and rice.
C.Shifting completely from cereal crops to pulse production.
D.The use of somatic hybridization to create 'Pomato'.
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.
Based on the biological control process, identify the correct interaction:
A.Ladybird eats Mosquitoes
B.Dragonflies eat Aphids
C.Bacillus thuringiensis kills Butterfly caterpillars
D.Trichoderma kills Ladybirds
- 2.
Which gas is NOT typically produced during anaerobic sludge digestion?
A.Methane
B.Hydrogen sulphide
C.Oxygen
D.Carbon dioxide
- 3.
The grit (large pebbles and soil) in primary sewage treatment is removed by:
A.Sequential filtration
B.Sedimentation
C.Biological action
D.Anaerobic digestion
- 4.
Which of these is a distillation-processed alcoholic drink?
A.Beer
B.Wine
C.Whisky
D.Cider
- 5.
Which of the following is a major component of biogas?
A.Propane
B.Butane
C.Methane
D.Ethane
- 6.
The spent slurry from a biogas plant is generally used as:
A.Fuel for vehicles
B.Fertilizer
C.Animal feed
D.Construction material
- 7.
Which of the following is used in the treatment of sewage to lower the BOD before the effluent is released?
A.Autotrophs
B.Heterotrophic microbes
C.Lithotrophs
D.Phototrophs
- 8.
The full potential of Penicillin as an effective antibiotic was established much later by which two scientists?
A.Ernest Chain and Howard Florey
B.Louis Pasteur and Robert Koch
C.Alexander Fleming and Selman Waksman
D.Edward Jenner and Jonas Salk
- 9.
Which of the following is the correct sequence of steps in a sewage treatment plant ()?
A.Primary sedimentation Aeration Secondary sedimentation Anaerobic digestion
B.Aeration Primary sedimentation Anaerobic digestion Secondary sedimentation
C.Secondary sedimentation Primary sedimentation Aeration Anaerobic digestion
D.Anaerobic digestion Aeration Primary sedimentation Secondary sedimentation
- 10.
The development of 'Bt-Cotton' involves the introduction of a gene from . How does this provide resistance against pests?
A.The plant produces a toxin that kills the larvae of certain insects upon ingestion
B.The plant produces a foul smell that repels all insects
C.The plant grows much faster than the rate at which pests can consume it
D.The plant secretes sticky substances that trap the insects
Download the worksheet for Biology and Human Welfare - Microbes in Human Welfare to practice offline. It includes additional chapter-level practice questions.