Tough Biology Test - Only For The Smartest

38 Questions | Total Attempts: 227

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Tough Biology Test - Only For The Smartest

Think you are a Biology expert? Let us tell you, this biology test is like no other. This has some difficult questions which require immense knowledge and a lot of brainstorming to answer. If you pass this quiz, you have successfully been entered into the category of intelligent biology enthusiasts. Take this quiz to find out where you stand and learn more along the way.


Questions and Answers
  • 1. 
    Which of the following applies to a multicellular organism that has a single opening acts as both mouth and anus
    • A. 

      Extracellular, simple digestive system

    • B. 

      extracellular, complex, complete digestive system

    • C. 

      Extracellular, complex, incomplete digestive system

    • D. 

      Intracellular, with the food being engulfed by a single cell

  • 2. 
    What is the difference between an autotroph and a heterotroph?
    • A. 

      Heterotrophs cannot make their own food, autotrophs can make their own food.

    • B. 

      Autotrophs cannot make their own food, heterotrophs can make their own food.

    • C. 

      Heterotrophs can make their own food using chemical energy, autotrophs can make their own food using light energy.

    • D. 

      Heterotrophs can make their own food using light energy, autotrophs can make their own food using chemical.

  • 3. 
    What nutrients are missing in the diet of person suffering from kwashiorkor?
    • A. 

      Vitamin D

    • B. 

      Vitamin C

    • C. 

      Complete protein.

    • D. 

      Carbohydrates

  • 4. 
    What is the difference between a gram calorie (gcal) and a dietary calorie (kcal)?
    • A. 

      1 kcal = 1000 gcal

    • B. 

      1000 kcal = 1 gcal

    • C. 

      10 kcal = 1 gcal

    • D. 

      10 gcal = 1 kcal

  • 5. 
    Why must some fats be in the diet?
    • A. 

      Fats are the only course of energy in the diet.

    • B. 

      Fats are the only source of vitamins in the B complex and vitamin C

    • C. 

      Only fats can provide a source of water in the diet by metabolic breakdown of the lipid molecules

    • D. 

      Fats in the diet contain essential fatty acids and carry fat-solutble vitamins

  • 6. 
    Which of the following is one of the five components of food but is NOT an energy source in food?
    • A. 

      fats and oils (lipids)

    • B. 

      proteins

    • C. 

      vitamins

    • D. 

      Carbohydrates

  • 7. 
    Autotrophs differ from heterotrophs in that autotrophs
    • A. 

      Cannot make their own food while heterotrophs can.

    • B. 

      Can make their own food while heterotrophs must have an outside supply of organic materials.

    • C. 

      do not require minerals while heterotrophs do require an outside source of minerals.

    • D. 

      Equire minerals while heterotrophs do not require an outside source of minerals

  • 8. 
    What is an essential nutrient?
    • A. 

      A nutrient that is found in all foods regardless of composition

    • B. 

      A nutrient that is not made in the body and must be supplied in the diet

    • C. 

      A nutrient that contains aromatic essential oils for flavor

    • D. 

      None of the above are correct.

  • 9. 
    What is the nutrient makeup of a bag of fertilizer that is labeled 25-10-3?
    • A. 

      25% N (nitrogen), 10% P (phosphorous), 3% K (potassium)

    • B. 

      25% useable nitrogen, 10% nonusable nitrogen, 3% inert filler

    • C. 

      25% total nitrogen, 10% useable nitrogen, 3% inert filler

    • D. 

      25% P (phosphorous), 10% N (nitrogen), 3% K (potassium)

  • 10. 
    What does a closed cirulatory system have that an open circulatory system does not have?
    • A. 

      Capillaries

    • B. 

      heart

    • C. 

      vessels

    • D. 

      Liquid such as blood or hemolymph

  • 11. 
    What is a vein?
    • A. 

      A vessel that carries only deoxygenated blood

    • B. 

      A vessel that carries only oxygenated blood

    • C. 

      A vessel that carries blood away from the heart

    • D. 

      A vessel that carries blood toward the heart

  • 12. 
    What causes varicose veins?
    • A. 

      Excess fat in the diet.

    • B. 

      Valves become incompetent and allow blood to pool in the vein, causing the vein to dilate permanently

    • C. 

      High blood pressure causes the vein to dilate

    • D. 

      Excess salt in the diet

  • 13. 
    What is the function of the right ventricle?
    • A. 

      Recieve blood from the lungs

    • B. 

      Recieve blood from the body

    • C. 

      Pump blood to the lungs

    • D. 

      Pump blood to the body

  • 14. 
    What do the valves of the heart and veins do?
    • A. 

      Store blood for emergency use

    • B. 

      Prevent backflow of blood

    • C. 

      Direct blood to the appropriate vessel at branch points in the circulatory system

    • D. 

      to cut off blood flow to injured parts of the body

  • 15. 
    The most primitive vertebrate heart is that of a fish. This heart is composed of
    • A. 

      2 atria and 2 ventricles

    • B. 

      1 atrium and 2 ventricles

    • C. 

      2 atria and 1 ventricle

    • D. 

      1 atrium and 1 ventricle

  • 16. 
    What are systole and diastole?
    • A. 

      Systole is the higher blood pressure caused by the contraction of the heart; diastole is the lower pressure when the heart relaxes

    • B. 

      Systole is the lower blood pressure when the heart relaxes; diastole is the higher blood pressure caused by the contraction of the heart

    • C. 

      Systole is the chest pressure caused by infilling the lungs due to inhalation; diastole occurs when air is exhaled.

    • D. 

      responses to stress on skeletal muscles measuring the ability of the muscles to contract and relax with each heartbeat

  • 17. 
    What happens when a cardiac muscle cell becomes depolarized?    
    • A. 

      Dies

    • B. 

      Relaxes

    • C. 

      Contracts

    • D. 

      Produces ATP

  • 18. 
    What is the natural pacemaker of the heart?
    • A. 

      Atrioventricular node

    • B. 

      Bundle of His

    • C. 

      Left atrial wall

    • D. 

      Sinoatrial node in the right atrium

  • 19. 
    Which mineral is directly involved in the blood clotting cascade?
    • A. 

      Selenium

    • B. 

      Calcium

    • C. 

      Zinc

    • D. 

      molybdenum

  • 20. 
    Plants typically obtain ____ from the atmosphere and _____ from the soil
    • A. 

      Water; minerals

    • B. 

      Carbon dioxide; water and minerals

    • C. 

      Water; carbon dioxide

    • D. 

      Mineral; water

  • 21. 
    What is required for plants to lead a dual existence?
    • A. 

      A mechanism for photosynthesis to occur

    • B. 

      A mechanism for transfer of materials between above ground below ground parts of the plant

    • C. 

      A mechanism to collect water

    • D. 

      A mechanism to support the plant

  • 22. 
    Xylem
    • A. 

      Transports water and minerals in a plant.

    • B. 

      Is composed of cells that are dead a maturity

    • C. 

      Is the only tissue in a plant in which photosynthesis occurs.

  • 23. 
    Loss of water from a leaf through the stomata is called
    • A. 

      Transpiration.

    • B. 

      Translocation

    • C. 

      transportation.

  • 24. 
    Which of the following are part of the stomata?
    • A. 

      Xylem cells

    • B. 

      Phloem cells

    • C. 

      Guard cells

  • 25. 
    What evidence supports the TACT theory?
    • A. 

      Xylem is under negative (inward) pressure

    • B. 

      Xylem is under positive (outward) pressure

    • C. 

      Aphids do not require energy to feed on plant sap

    • D. 

      Cut flowers will not wilt if no water is provided to them

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