Biology (School & UG)
Q. What is the main advantage of using transgenic plants in agriculture?
A.
Higher market prices
B.
Increased crop yield
C.
More labor-intensive farming
D.
Reduced biodiversity
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Solution
Transgenic plants are engineered to have traits that can lead to increased crop yield, making them advantageous in agriculture.
Correct Answer: B — Increased crop yield
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Q. What is the main benefit of consuming antioxidants found in fruits and vegetables?
A.
Increase energy
B.
Reduce inflammation
C.
Enhance digestion
D.
Improve vision
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Solution
Antioxidants help reduce inflammation and combat oxidative stress in the body.
Correct Answer: B — Reduce inflammation
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Q. What is the main benefit of consuming cruciferous vegetables like broccoli and kale?
A.
High protein content
B.
Rich in antioxidants
C.
Low calorie count
D.
High fat content
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Solution
Cruciferous vegetables are rich in antioxidants, which help protect against diseases.
Correct Answer: B — Rich in antioxidants
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Q. What is the main benefit of consuming dietary fiber from plants?
A.
Increased energy
B.
Improved digestion
C.
Enhanced taste
D.
Faster metabolism
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Solution
Dietary fiber aids in digestion and helps maintain gut health.
Correct Answer: B — Improved digestion
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Q. What is the main benefit of consuming omega-3 fatty acids found in certain plants?
A.
Improved digestion
B.
Enhanced cognitive function
C.
Increased energy
D.
Better skin hydration
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Solution
Omega-3 fatty acids, found in plants like flaxseed, are known to enhance cognitive function and support brain health.
Correct Answer: B — Enhanced cognitive function
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Q. What is the main byproduct of photosynthesis?
A.
Oxygen
B.
Carbon dioxide
C.
Glucose
D.
Water
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Solution
Oxygen is released as a byproduct of photosynthesis during the light reactions.
Correct Answer: A — Oxygen
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Q. What is the main characteristic of sclerenchyma cells?
A.
Flexible and living at maturity
B.
Thick, lignified cell walls and dead at maturity
C.
Thin cell walls and living at maturity
D.
Photosynthetic and living at maturity
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Solution
Sclerenchyma cells have thick, lignified walls and are dead at maturity, providing structural support.
Correct Answer: B — Thick, lignified cell walls and dead at maturity
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Q. What is the main component of the plant cell wall?
A.
Cellulose
B.
Chitin
C.
Lignin
D.
Pectin
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Solution
Cellulose is the primary structural component of the plant cell wall, providing rigidity and strength.
Correct Answer: A — Cellulose
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Q. What is the main difference between aerobic and anaerobic respiration in plants?
A.
Oxygen requirement
B.
Energy yield
C.
Location in the plant
D.
Type of glucose used
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Solution
The main difference is that aerobic respiration requires oxygen, while anaerobic respiration does not.
Correct Answer: A — Oxygen requirement
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Q. What is the main difference between disinfection and sterilization?
A.
Disinfection kills all microbes; sterilization does not
B.
Sterilization kills all microbes; disinfection reduces microbial load
C.
Disinfection is used on inanimate objects; sterilization is not
D.
There is no difference
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Solution
Sterilization kills all microbes, while disinfection reduces the number of viable organisms but may not eliminate all.
Correct Answer: B — Sterilization kills all microbes; disinfection reduces microbial load
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Q. What is the main difference between sterilization and disinfection?
A.
Sterilization kills all microbes; disinfection reduces them
B.
Disinfection kills all microbes; sterilization reduces them
C.
Sterilization is faster than disinfection
D.
Disinfection is only for surfaces, sterilization is for instruments
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Solution
Sterilization kills all microbes, while disinfection reduces the number of viable microorganisms.
Correct Answer: A — Sterilization kills all microbes; disinfection reduces them
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Q. What is the main energy carrier produced during the light reactions?
A.
NADPH
B.
ATP
C.
FADH2
D.
Glucose
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Solution
ATP is the main energy carrier produced during the light reactions of photosynthesis.
Correct Answer: B — ATP
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Q. What is the main energy currency produced during the light reactions?
A.
NADPH
B.
FADH2
C.
ATP
D.
Glucose
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Solution
ATP is the main energy currency produced during the light reactions of photosynthesis.
Correct Answer: C — ATP
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Q. What is the main enzyme involved in the carbon fixation process during the dark reactions?
A.
RUBISCO
B.
ATP synthase
C.
NADP+ reductase
D.
Phosphofructokinase
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Solution
RUBISCO is the main enzyme that catalyzes the fixation of carbon dioxide in the dark reactions.
Correct Answer: A — RUBISCO
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Q. What is the main function of alkaloids in plants?
A.
Energy storage
B.
Defense against herbivores
C.
Water retention
D.
Photosynthesis
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Solution
Alkaloids serve as a defense mechanism against herbivores due to their toxicity.
Correct Answer: B — Defense against herbivores
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Q. What is the main function of antioxidants found in plants?
A.
Promote growth
B.
Prevent oxidative stress
C.
Aid in reproduction
D.
Enhance photosynthesis
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Solution
Antioxidants help prevent oxidative stress by neutralizing free radicals.
Correct Answer: B — Prevent oxidative stress
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Q. What is the main function of chlorophyll in plants?
A.
Water absorption
B.
Nutrient transport
C.
Light absorption
D.
Gas exchange
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Solution
Chlorophyll's main function is to absorb light energy for photosynthesis.
Correct Answer: C — Light absorption
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Q. What is the main function of cytotoxic T cells?
A.
Produce antibodies
B.
Kill infected or cancerous cells
C.
Activate B cells
D.
Secrete cytokines
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Solution
Cytotoxic T cells are primarily responsible for killing infected or cancerous cells.
Correct Answer: B — Kill infected or cancerous cells
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Q. What is the main function of phagocytes in the immune system?
A.
To produce antibodies
B.
To present antigens
C.
To engulf and digest pathogens
D.
To secrete cytokines
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Solution
Phagocytes, such as macrophages and neutrophils, are specialized cells that engulf and digest pathogens, playing a key role in the innate immune response.
Correct Answer: C — To engulf and digest pathogens
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Q. What is the main function of phloem in plants?
A.
Transport water
B.
Transport nutrients
C.
Transport sugars
D.
Support structure
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Solution
Phloem is responsible for transporting sugars and other metabolic products downward from the leaves.
Correct Answer: C — Transport sugars
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Q. What is the main function of phloem in vascular plants?
A.
Transport water
B.
Transport nutrients
C.
Transport sugars
D.
Support structure
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Solution
Phloem is responsible for transporting sugars produced during photosynthesis throughout the plant.
Correct Answer: C — Transport sugars
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Q. What is the main function of root hairs?
A.
Photosynthesis
B.
Nutrient absorption
C.
Support
D.
Storage
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Solution
Root hairs increase the surface area for water and nutrient absorption from the soil.
Correct Answer: B — Nutrient absorption
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Q. What is the main function of stomata in plant leaves?
A.
Nutrient absorption
B.
Gas exchange
C.
Water storage
D.
Photosynthesis
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Solution
Stomata are small openings that facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer: B — Gas exchange
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Q. What is the main function of stomata in plants?
A.
Nutrient absorption
B.
Gas exchange
C.
Water storage
D.
Support
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Solution
Stomata facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer: B — Gas exchange
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Q. What is the main function of the Calvin cycle?
A.
To produce ATP
B.
To fix carbon dioxide
C.
To absorb light
D.
To release oxygen
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Solution
The main function of the Calvin cycle is to fix carbon dioxide into organic molecules.
Correct Answer: B — To fix carbon dioxide
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Q. What is the main function of the cambium in plants?
A.
Photosynthesis
B.
Water transport
C.
Growth in thickness
D.
Nutrient storage
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Solution
The cambium is responsible for secondary growth, allowing plants to increase in thickness.
Correct Answer: C — Growth in thickness
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Q. What is the main function of the enzyme RuBisCO in photosynthesis?
A.
Fixing carbon dioxide
B.
Producing ATP
C.
Splitting water
D.
Generating NADPH
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Solution
RuBisCO is responsible for fixing carbon dioxide in the Calvin cycle.
Correct Answer: A — Fixing carbon dioxide
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Q. What is the main function of the gallbladder?
A.
Stores bile
B.
Produces bile
C.
Absorbs nutrients
D.
Secretes digestive enzymes
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Solution
The gallbladder stores bile produced by the liver until it is needed for digestion.
Correct Answer: A — Stores bile
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Q. What is the main function of the light reactions in photosynthesis?
A.
To produce glucose
B.
To convert light energy into chemical energy
C.
To release carbon dioxide
D.
To absorb water
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Solution
The main function of the light reactions is to convert light energy into chemical energy in the form of ATP and NADPH.
Correct Answer: B — To convert light energy into chemical energy
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Q. What is the main function of the light reactions?
A.
To produce glucose
B.
To convert solar energy to chemical energy
C.
To release carbon dioxide
D.
To synthesize proteins
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Solution
The main function of the light reactions is to convert solar energy into chemical energy in the form of ATP and NADPH.
Correct Answer: B — To convert solar energy to chemical energy
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