What is the primary source of variation in a population?
- A. Gene flow
- B. Mutation
- C. Natural selection
- D. Genetic drift
Which of the following statements about the heart is true?
- A. The heart is responsible for the production of red blood cells
- B. The heart pumps oxygenated blood to the lungs
- C. The heart receives blood from the kidneys and filters waste products
- D. The heart is a muscular organ that contracts to circulate blood throughout the body
What is the term used to describe the maximum number of individuals of a species that an environment can support indefinitely?
- A. Ecological niche
- B. Limiting factor
- C. Carrying capacity
- D. Density-dependent factor
What is the definition of population ecology?
- A. The study of interactions between organisms and their physical environment
- B. The study of evolutionary processes and their effects on populations
- C. The study of interactions between different populations in an ecosystem
- D. The study of the distribution and abundance of individuals within a species
Which of the following traits is not visible in a person with Down syndrome?
- A. Short neck
- B. High muscle tone
- C. Small stature
- D. Slant eyes
Which of the following is an example of a behavioral adaptation for survival in animals?
- A. Sharp teeth
- B. Migration
- C. Wings
- D. Camouflage
Which of the following is a male reproductive organ in humans?
- A. Uterus
- B. Ovary
- C. Testis
- D. Fallopian tube
The theory of evolution can be defined as
- A. The belief that all species were created in their current form
- B. The hypothesis that organisms strive to improve themselves over generations
- C. The idea that species change over time through natural processes
- D. The concept that evolution occurs through a series of sudden and dramatic changes
What is autotrophic nutrition?
- A. Nutrition in which organisms obtain food by breaking down complex organic compounds.
- B. Nutrition in which organisms obtain food from other organisms
- C. Nutrition in which organisms obtain food by consuming both plants and animals
- D. Nutrition in which organisms produce their own food using energy from the sun or inorganic substances
Which processes are involved in nutrient cycling in a functioning ecosystem?
- A. Erosion, weathering, and sedimentation
- B. Decomposition, evaporation, and precipitation
- C. Nitrogen fixation, denitrification, and ammonification
- D. Respiration, photosynthesis, and transpiration
Which type of reproduction involves the fusion of gametes from two parents?
- A. Sexual reproduction
- B. Asexual reproduction
- C. Binary fission
- D. Budding
Which of the following soil types becomes less fertile due to the intense leaching caused by tropical rains?
- A. Yellow soil
- B. Laterite soil
- C. Red soils
- D. Black soil
Which of the following functions is performed by the skin to help maintain homeostasis in the human body?
- A. Regulation of body temperature
- B. Filtration of blood
- C. Production of hormones
- D. Digestion of food
Which process in the nutrient cycle converts atmospheric nitrogen into a form that plants can utilize?
- A. Denitrification
- B. Nitrogen fixation
- C. Ammonification
- D. Nitrification
The natural place of an organism or community is known as
- A. Niche
- B. Habit
- C. Biome
- D. Habitat
Behavioral adaptation for dealing with a hot climate could include
- A. Hibernating during the hottest part of the day
- B. Large scales on the back of a lizard
- C. Feeding during the hottest part of the day
- D. A small kidney to conserve water
Which of the following processes is involved in the reproduction of developing organisms?
- A. Budding
- B. Germination
- C. Fertilization
- D. Pollination
Which of the following is an example of an abiotic ecological factor?
- A. Temperature
- B. Competition
- C. Predation
- D. Symbiosis
What is the tissue responsible for transporting water and minerals from the roots to the rest of the plant?
- A. Xylem
- B. Epidermis
- C. Parenchyma
- D. Phloem
In monohybrid inheritance, if an organism carries two different alleles for a particular gene, it is called:
- A. Homozygous
- B. Dominant
- C. Heterozygous
- D. Recessive
Most fishes do not sink in water because of the presences of:
I. swim bladder
II. air bladder
III. air sacs
IV. air in spongy bones
- A. II and III are correct
- B. I and II are correct
- C. I, II, III and IV are correct
- D. III and IV are correct