Q. What is the main purpose of classification in biology? (2019)
A.
To identify organisms
B.
To understand evolutionary relationships
C.
To simplify the study of organisms
D.
All of the above
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Solution
The main purpose of classification in biology is to identify organisms, understand evolutionary relationships, and simplify the study of organisms.
Correct Answer: D — All of the above
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Q. What is the main purpose of family planning? (2021)
A.
To increase population growth
B.
To allow couples to decide the number and spacing of children
C.
To promote early childbirth
D.
To discourage contraceptive use
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Solution
Family planning enables couples to make informed decisions about the number and spacing of their children.
Correct Answer: B — To allow couples to decide the number and spacing of children
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Q. What is the main purpose of reproduction in organisms? (2020)
A.
To maintain homeostasis
B.
To produce energy
C.
To ensure species survival
D.
To grow and develop
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Solution
The main purpose of reproduction is to ensure the survival of a species by producing new individuals.
Correct Answer: C — To ensure species survival
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Q. What is the main purpose of respiration in plants? (2023)
A.
To produce glucose
B.
To release energy
C.
To absorb water
D.
To synthesize proteins
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Solution
The main purpose of respiration in plants is to release energy from glucose, which is essential for various cellular processes.
Correct Answer: B — To release energy
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Q. What is the main purpose of sexual reproduction? (2020)
A.
To produce more offspring
B.
To create genetic diversity
C.
To ensure survival of the species
D.
To reduce competition
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Solution
The main purpose of sexual reproduction is to create genetic diversity, which can improve adaptability.
Correct Answer: B — To create genetic diversity
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Q. What is the main purpose of the acrosome in sperm? (2022)
A.
To provide energy
B.
To penetrate the egg
C.
To store genetic material
D.
To aid in motility
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Solution
The acrosome contains enzymes that help the sperm penetrate the outer layers of the egg during fertilization.
Correct Answer: B — To penetrate the egg
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Q. What is the main purpose of the amniotic fluid? (2023)
A.
Protection of the fetus
B.
Nourishment of the fetus
C.
Gas exchange
D.
Hormonal regulation
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Solution
The main purpose of the amniotic fluid is to protect the fetus by cushioning it from physical shocks.
Correct Answer: A — Protection of the fetus
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Q. What is the main purpose of the G1 phase in the cell cycle? (2022)
A.
DNA replication
B.
Cell growth and preparation for DNA synthesis
C.
Chromosome separation
D.
Cell division
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Solution
The G1 phase is primarily for cell growth and preparation for DNA synthesis.
Correct Answer: B — Cell growth and preparation for DNA synthesis
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Q. What is the main purpose of the menstrual cycle? (2023)
A.
To prepare the body for pregnancy
B.
To produce sperm
C.
To regulate hormone levels
D.
To eliminate waste
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Solution
The main purpose of the menstrual cycle is to prepare the female body for potential pregnancy each month.
Correct Answer: A — To prepare the body for pregnancy
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Q. What is the main purpose of the S phase in the cell cycle? (2022)
A.
Cell growth
B.
DNA replication
C.
Cell division
D.
Protein synthesis
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Solution
The S phase is specifically for DNA replication, ensuring that each daughter cell receives a complete set of chromosomes.
Correct Answer: B — DNA replication
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Q. What is the main purpose of using biopesticides in agriculture? (2023)
A.
Increase crop yield
B.
Reduce chemical pesticide use
C.
Enhance soil fertility
D.
Improve water retention
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Solution
Biopesticides are used to reduce the reliance on chemical pesticides, promoting a more sustainable approach to pest management.
Correct Answer: B — Reduce chemical pesticide use
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Q. What is the main purpose of using genetically modified crops? (2023)
A.
To produce more flowers
B.
To enhance flavor
C.
To improve resistance to diseases
D.
To reduce labor costs
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Solution
Genetically modified crops are primarily developed to improve resistance to diseases, pests, and environmental conditions.
Correct Answer: C — To improve resistance to diseases
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Q. What is the main purpose of using significant figures in measurements? (2019)
A.
To increase the number of digits
B.
To indicate precision
C.
To simplify calculations
D.
To convert units
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Solution
Significant figures indicate the precision of a measurement, reflecting the certainty of the digits.
Correct Answer: B — To indicate precision
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Q. What is the main reaction of phenols with bromine water? (2020)
A.
No reaction
B.
Formation of brominated phenol
C.
Formation of phenyl ether
D.
Formation of phenol red
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Solution
Phenols react with bromine water to form brominated phenols, which are usually colorless or pale yellow.
Correct Answer: B — Formation of brominated phenol
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Q. What is the main reaction of phenols with sodium hydroxide? (2020)
A.
Formation of sodium phenoxide
B.
Formation of ether
C.
Formation of alcohol
D.
Formation of ketone
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Solution
Phenols react with sodium hydroxide to form sodium phenoxide, which is a salt of phenol.
Correct Answer: A — Formation of sodium phenoxide
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Q. What is the main reproductive structure of angiosperms? (2021)
A.
Cone
B.
Flower
C.
Sporangium
D.
Thallus
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Solution
The main reproductive structure of angiosperms is the flower, which facilitates reproduction through pollination.
Correct Answer: B — Flower
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Q. What is the main role of dietary fiber in human health? (2021)
A.
Increase cholesterol
B.
Aid digestion
C.
Provide energy
D.
Enhance taste
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Solution
Dietary fiber aids digestion by promoting regular bowel movements and preventing constipation.
Correct Answer: B — Aid digestion
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Q. What is the main source of omega-3 fatty acids? (2021)
A.
Fish oil
B.
Butter
C.
Coconut oil
D.
Olive oil
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Solution
Fish oil is a rich source of omega-3 fatty acids, which are important for heart health and brain function.
Correct Answer: A — Fish oil
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Q. What is the main source of ozone depletion? (2021)
A.
Carbon dioxide
B.
Chlorofluorocarbons (CFCs)
C.
Methane
D.
Nitrous oxide
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Solution
Chlorofluorocarbons (CFCs) are the primary substances responsible for ozone layer depletion.
Correct Answer: B — Chlorofluorocarbons (CFCs)
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Q. What is the main source of ozone layer depletion? (2021)
A.
Carbon dioxide
B.
Chlorofluorocarbons (CFCs)
C.
Methane
D.
Nitrous oxide
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Solution
Chlorofluorocarbons (CFCs) are the primary substances responsible for the depletion of the ozone layer.
Correct Answer: B — Chlorofluorocarbons (CFCs)
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Q. What is the main substrate for respiration in plants? (2023)
A.
Starch
B.
Glucose
C.
Cellulose
D.
Sucrose
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Solution
Glucose is the main substrate for respiration in plants, as it is broken down to release energy.
Correct Answer: B — Glucose
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Q. What is the main type of reaction that haloalkanes undergo? (2020)
A.
Addition
B.
Substitution
C.
Elimination
D.
Redox
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Solution
Haloalkanes primarily undergo nucleophilic substitution reactions due to the presence of a good leaving group (halogen).
Correct Answer: B — Substitution
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Q. What is the main use of citric acid?
A.
Preservative
B.
Flavoring agent
C.
Cleaning agent
D.
All of the above
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Solution
Citric acid is used as a preservative, flavoring agent, and cleaning agent.
Correct Answer: D — All of the above
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Q. What is the main vector for malaria transmission? (2021)
A.
Housefly
B.
Mosquito
C.
Tick
D.
Flea
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Solution
Malaria is primarily transmitted by the female Anopheles mosquito.
Correct Answer: B — Mosquito
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Q. What is the main vector for the transmission of malaria? (2019)
A.
Housefly
B.
Mosquito
C.
Tick
D.
Flea
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Solution
Malaria is primarily transmitted through the bite of infected female Anopheles mosquitoes.
Correct Answer: B — Mosquito
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Q. What is the major product when 1-bromobutane reacts with sodium ethoxide? (2021)
A.
Butane
B.
Ethyl butyl ether
C.
1-butanol
D.
2-butanol
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Solution
The reaction of 1-bromobutane with sodium ethoxide leads to the formation of ethyl butyl ether through an SN2 mechanism.
Correct Answer: B — Ethyl butyl ether
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Q. What is the major product when 2-bromobutane is treated with KOH in ethanol?
A.
But-1-ene
B.
But-2-ene
C.
Butane
D.
No reaction
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Solution
The major product is But-2-ene due to the more stable double bond formed during elimination.
Correct Answer: B — But-2-ene
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Q. What is the male gamete in flowering plants called? (2020)
A.
Ovule
B.
Pollen
C.
Style
D.
Stigma
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Solution
The male gamete in flowering plants is called pollen, which is produced in the anthers of the stamen.
Correct Answer: B — Pollen
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Q. What is the male reproductive part of a flower called? (2020)
A.
Stigma
B.
Anther
C.
Ovary
D.
Style
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Solution
The male reproductive part of a flower is called the stamen, which consists of the anther and filament. The anther is the part that produces pollen.
Correct Answer: B — Anther
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Q. What is the mass defect of a nucleus? (2019)
A.
The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
B.
The mass of the nucleus itself
C.
The mass of the electrons surrounding the nucleus
D.
The mass of the nucleus in a different state
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Solution
The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons, which accounts for the binding energy.
Correct Answer: A — The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
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