Bio Mock Exam Topics Summary

Photosynthesis

  • Definition: The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.
  • Rate of Photosynthesis: Influenced by light intensity, carbon dioxide concentration, and temperature.
  • Graph Analysis: Understand how to interpret graphs displaying the relationship between light intensity and photosynthesis rates.

Classification of Insects

  • Insects classified based on characteristics such as:
    • Body structure (head, thorax, abdomen)
    • Wing structure (number and type of wings)
    • Mouthparts (siphoning, chewing, etc.)

Food Chains and Food Webs

  • Food Chain: A linear sequence of organisms where each is eaten by the next one in the chain.
  • Food Web: A complex network of interconnected food chains.
  • Trophic Levels: Levels in a food chain, usually described as:
    • Producers (e.g. plants)
    • Primary consumers (herbivores)
    • Secondary consumers (carnivores)
    • Tertiary consumers (top predators)

Symbiotic Relationships

  • Definition: Interactions between two different organisms living in close physical proximity.
  • Types:
    • Mutualism: Both species benefit.
    • Commensalism: One benefits, the other is neither helped nor harmed.
    • Parasitism: One benefits at the expense of the other.
  • Function of Decomposers:
    • Break down dead organic matter, returning nutrients to the soil.
    • Benefits include nutrient cycling; detriments include potential disease spread.

Biodegradation

  • Definition: The breakdown of organic substances by natural processes, typically by microorganisms.

Conservation Strategies

  • Preservation: Protecting areas from human interference.
  • Restoration: Rehabilitating degraded ecosystems.
  • Reafforestation: Planting trees in deforested areas.

Greenhouse Effect

  • Causes: Increase in greenhouse gases due to human activities (e.g., burning fossil fuels).
  • Effects: Global warming, climate change, extreme weather patterns.

Factors Contributing to Population Size

  • Influenced by birth rates, death rates, immigration, and emigration.

Specialized Cells

  • Cheek Cells / Muscle Cells: Have unique structures and functions related to their roles.
  • Plant vs. Animal Cells: Differences include presence of a cell wall, chloroplasts in plant cells, and large central vacuoles.

Transport Across Cells

  • Osmosis: Movement of water molecules from a region of lower solute concentration to higher.
  • Diffusion: Movement of molecules from an area of high concentration to low.
  • Active Transport: Movement of molecules against their concentration gradient, requiring energy.

Mineral Deficiencies in Plants

  • Symptoms: Stunted growth, yellowing of leaves.
  • Common deficiencies include Nitrogen, Phosphorus, and Potassium.

Food Tests

  • Tests for macromolecules:
    • Starch: Iodine test (blue/black color indicates presence).
    • Reducing sugars: Benedict's test (brick-red color indicates presence).
    • Proteins: Biuret test (purple color indicates presence).
    • Lipids: Emulsion test (cloudy white layer indicates presence).

Excess Nutrients in the Body

  • Can lead to storage issues, such as obesity due to excess carbohydrates.
  • Fat-soluble vitamins can accumulate and become toxic.

Adaptation of the Lungs

  • Structures such as alveoli increase surface area for efficient gas exchange.
  • Respiration: The process of taking in oxygen and expelling carbon dioxide.

Effects of Cigarette Components

  • Toxic substances (tar, nicotine) harm lung tissue and overall health.

Structure and Function of Blood Vessels

  • Types:
    • Arteries: Carry oxygen-rich blood away from the heart.
    • Veins: Return oxygen-poor blood to the heart.
    • Capillaries: Exchange materials between blood and tissues.

Blood Cells and Immunization

  • Types: Red blood cells (carry oxygen), white blood cells (immune response).
  • Immunization: Introduction of antigens to stimulate the immune response.

Transpiration in Plants

  • The process of water movement through a plant and its evaporation from aerial parts.

Plant Movement and Sensitivity Coordination

  • Mechanisms by which plants respond to environmental stimuli (e.g., phototropism).
  • Coordination in animals involves the brain, eyes, and nervous system.

Effects of Alcohol Abuse

  • Impairs judgment, coordination, and can cause long-term health issues such as liver damage.

Plant and Animal Reproduction

  • Pollination: Transfer of pollen to fertilize the ovule.
  • Seed Dispersal: Mechanisms include wind, water, and animals.
  • Fertilization: Fusion of male and female gametes to form a zygote.

Contraceptives and Diseases

  • Birth control methods to prevent pregnancy and sexually transmitted diseases.

Genetic Terms

  • Gene: A segment of DNA that codes for a protein.
  • Gene Expression: The process by which information from a gene is used to synthesize functional gene products (essentially proteins).
  • Genetic Variation: Differences in DNA among individuals which contribute to diversity within a population.

Genetic Diagrams

  • Can illustrate inheritance patterns and predict genotype/phenotype ratios (e.g., Punnett squares).

Artificial Selection / Genetic Engineering

  • Artificial Selection: Selecting for desired traits in offspring.
  • Genetic Engineering: Direct manipulation of an organism's genes using biotechnology.

Effect of Temperature on Enzyme Activity

  • Generally, enzyme activity increases with temperature until it reaches an optimal point, after which activity declines due to denaturation.
  • Graph Analysis: Be familiar with interpreting graphs that exhibit enzyme activity across varying temperatures.

Structure and Function of the Vitreous

  • Found in the eye, the vitreous humor maintains eye shape and allows light to reach the retina.

Excretion vs. Elimination

  • Excretion: The removal of metabolic waste (e.g., urea via urine).
  • Elimination: The disposal of undigested food material via feces.

Kidney and Nephron Structure

  • Kidney Function: Regulates blood pressure, electrolyte balance, removes waste.
  • Nephron: Functional unit of the kidney, filtering blood and producing urine.
    • Glucose in Filtrate: Normally reabsorbed; should not be present in urine.
    • Protein in Urine: Normally absent; presence can indicate kidney damage.