Q. What enzyme is responsible for the digestion of carbohydrates in the mouth? (2020)
A.
Pepsin
B.
Amylase
C.
Lipase
D.
Trypsin
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Solution
Salivary amylase is the enzyme that begins the digestion of carbohydrates in the mouth.
Correct Answer: B — Amylase
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Q. What happens during telophase of mitosis? (2019)
A.
Chromosomes condense
B.
Nuclear envelope re-forms
C.
Spindle fibers disappear
D.
Both B and C
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Solution
During telophase, the nuclear envelope re-forms around the separated chromosomes, and spindle fibers disappear.
Correct Answer: D — Both B and C
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Q. What hormone is primarily responsible for regulating blood glucose levels? (2020)
A.
Insulin
B.
Glucagon
C.
Cortisol
D.
Adrenaline
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Solution
Insulin is the hormone produced by the pancreas that lowers blood glucose levels by facilitating the uptake of glucose into cells.
Correct Answer: A — Insulin
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Q. What hormone is primarily responsible for regulating blood sugar levels? (2020)
A.
Insulin
B.
Glucagon
C.
Adrenaline
D.
Cortisol
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Solution
Insulin is the hormone produced by the pancreas that lowers blood sugar levels by facilitating the uptake of glucose into cells.
Correct Answer: A — Insulin
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Q. What is a trophic level? (2020)
A.
A level of energy in an ecosystem
B.
A level of biodiversity
C.
A level of pollution
D.
A level of soil fertility
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Solution
A trophic level refers to the position an organism occupies in a food chain, indicating its energy level.
Correct Answer: A — A level of energy in an ecosystem
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Q. What is adaptive radiation? (1960)
A.
Rapid evolution of many species from a common ancestor
B.
Evolution of similar traits in unrelated species
C.
The extinction of a species
D.
The migration of species to new habitats
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Solution
Adaptive radiation is the rapid evolution of many species from a common ancestor, often occurring when species colonize new environments with diverse ecological niches.
Correct Answer: A — Rapid evolution of many species from a common ancestor
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Q. What is binomial nomenclature? (2021)
A.
A method of classifying organisms
B.
A two-part naming system
C.
A type of genetic mutation
D.
A method of reproduction
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Solution
Binomial nomenclature is a two-part naming system for organisms, consisting of the genus and species names.
Correct Answer: B — A two-part naming system
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Q. What is carrying capacity? (2021)
A.
The maximum number of individuals an environment can support
B.
The minimum number of individuals needed for a population to survive
C.
The average number of individuals in a population
D.
The number of species in a community
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Solution
Carrying capacity is the maximum number of individuals of a species that an environment can sustainably support.
Correct Answer: A — The maximum number of individuals an environment can support
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Q. What is genetic drift? (2015)
A.
Change in allele frequencies due to chance
B.
Natural selection acting on a population
C.
Migration of individuals into a population
D.
Mutation of genes
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Solution
Genetic drift refers to changes in allele frequencies in a population due to random sampling of organisms, which can lead to significant changes over time, especially in small populations.
Correct Answer: A — Change in allele frequencies due to chance
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Q. What is ovulation? (2023)
A.
Release of an egg from the ovary
B.
Fertilization of the egg
C.
Implantation of the embryo
D.
Menstruation
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Solution
Ovulation is the process of releasing an egg from the ovary, which is a key event in the female reproductive cycle.
Correct Answer: A — Release of an egg from the ovary
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Q. What is parthenogenesis? (2020)
A.
Development of an embryo from an unfertilized egg
B.
A form of asexual reproduction
C.
A type of sexual reproduction
D.
Both a and b
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Solution
Parthenogenesis is a form of asexual reproduction where an embryo develops from an unfertilized egg, and it is considered a type of asexual reproduction.
Correct Answer: D — Both a and b
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Q. What is the average duration of a human menstrual cycle? (2023)
A.
21 days
B.
28 days
C.
35 days
D.
14 days
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Solution
The average duration of a human menstrual cycle is approximately 28 days.
Correct Answer: B — 28 days
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Q. What is the average duration of a human pregnancy? (2023)
A.
28 weeks
B.
36 weeks
C.
40 weeks
D.
44 weeks
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Solution
The average duration of a human pregnancy is approximately 40 weeks.
Correct Answer: C — 40 weeks
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Q. What is the average lifespan of a red blood cell in the human body? (2020)
A.
10 days
B.
30 days
C.
120 days
D.
1 year
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Solution
Red blood cells typically have an average lifespan of about 120 days before they are removed from circulation by the spleen.
Correct Answer: C — 120 days
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Q. What is the average volume of blood in an adult human body? (2020)
A.
3-4 liters
B.
4-5 liters
C.
5-6 liters
D.
6-7 liters
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Solution
The average volume of blood in an adult human body is approximately 5 to 6 liters.
Correct Answer: C — 5-6 liters
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Q. What is the basic structural and functional unit of an animal's body? (2020)
A.
Tissue
B.
Cell
C.
Organ
D.
Organ System
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Solution
The basic structural and functional unit of an animal's body is the cell.
Correct Answer: B — Cell
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Q. What is the basic structural and functional unit of life in animals? (2020)
A.
Tissue
B.
Cell
C.
Organ
D.
Organ System
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Solution
The basic structural and functional unit of life in animals is the cell.
Correct Answer: B — Cell
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Q. What is the basic structural and functional unit of life? (2020)
A.
Tissue
B.
Organ
C.
Cell
D.
Organism
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Solution
The cell is the basic structural and functional unit of life, as it is the smallest unit that can carry out all life processes.
Correct Answer: C — Cell
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Q. What is the basic unit of classification in biology? (2020)
A.
Species
B.
Genus
C.
Family
D.
Order
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Solution
The basic unit of classification in biology is the species, which is defined as a group of organisms that can interbreed and produce fertile offspring.
Correct Answer: A — Species
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Q. What is the basic unit of heredity? (2020)
A.
Gene
B.
Chromosome
C.
DNA
D.
RNA
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Solution
A gene is the basic unit of heredity, responsible for the transmission of traits from parents to offspring.
Correct Answer: A — Gene
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Q. What is the basic unit of life? (2020)
A.
Atom
B.
Molecule
C.
Cell
D.
Tissue
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Solution
The cell is the basic unit of life as it is the smallest structural and functional unit of an organism.
Correct Answer: C — Cell
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Q. What is the effect of cortisol on the body? (2019)
A.
Increases metabolism
B.
Reduces inflammation
C.
Stimulates insulin production
D.
Increases blood pressure
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Solution
Cortisol is a steroid hormone that helps reduce inflammation and is involved in the stress response.
Correct Answer: B — Reduces inflammation
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Q. What is the effect of deforestation on biodiversity? (2019)
A.
Increases biodiversity
B.
No effect on biodiversity
C.
Decreases biodiversity
D.
Enhances ecosystem services
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Solution
Deforestation leads to habitat loss, which significantly decreases biodiversity as many species lose their homes.
Correct Answer: C — Decreases biodiversity
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Q. What is the effect of deforestation on the carbon cycle? (2021)
A.
Increases carbon sequestration
B.
Decreases carbon dioxide levels
C.
Increases carbon dioxide levels
D.
Has no effect
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Solution
Deforestation increases carbon dioxide levels in the atmosphere as trees that absorb CO2 are removed.
Correct Answer: C — Increases carbon dioxide levels
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Q. What is the effect of gibberellins on seed germination? (2020)
A.
Inhibits germination
B.
Promotes germination
C.
No effect
D.
Causes premature germination
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Solution
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
Correct Answer: B — Promotes germination
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Q. What is the effect of high protein intake on urea production? (2022)
A.
Decreases urea production
B.
Increases urea production
C.
No effect on urea production
D.
Increases ammonia production
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Solution
High protein intake increases the production of urea as more amino acids are metabolized.
Correct Answer: B — Increases urea production
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Q. What is the effect of magnesium deficiency in plants? (2022)
A.
Stunted growth
B.
Leaf curling
C.
Chlorosis
D.
Wilting
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Solution
Magnesium deficiency leads to chlorosis, particularly in older leaves, as it is a key component of chlorophyll.
Correct Answer: C — Chlorosis
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Q. What is the effect of parathyroid hormone (PTH)? (2019)
A.
Increase calcium levels in blood
B.
Decrease calcium levels in blood
C.
Increase phosphate levels
D.
Decrease phosphate levels
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Solution
Parathyroid hormone (PTH) increases calcium levels in the blood by stimulating the release of calcium from bones and increasing calcium absorption in the intestines.
Correct Answer: A — Increase calcium levels in blood
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Q. What is the effect of photoperiod on flowering in plants? (2020)
A.
It has no effect
B.
It determines the timing of flowering
C.
It inhibits flowering
D.
It promotes vegetative growth
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Solution
Photoperiod is crucial in determining the timing of flowering in many plants, influencing their reproductive cycle.
Correct Answer: B — It determines the timing of flowering
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Q. What is the effect of plastic pollution on marine life? (2022)
A.
Increased fish populations
B.
Habitat destruction
C.
Bioaccumulation of toxins
D.
Both b and c
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Solution
Plastic pollution leads to habitat destruction and bioaccumulation of toxins in marine organisms, severely impacting marine ecosystems.
Correct Answer: D — Both b and c
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