This quiz works best with JavaScript enabled. Home > Science > Biology > Biology – Quiz 40 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Biology Quiz 40 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The cell cycle is regulated by A) Cyclins. B) Chromosomes. C) Centromeres. D) None of above. Show Answer Correct Answer: A) Cyclins. 2. What is lost between trophic levels and cannot be recycled? A) Heat. B) Nitrogen. C) Carbon compounds. D) Biomass. Show Answer Correct Answer: A) Heat. 3. Which group to these belong to? slug, snail, clams, octopus A) Mollusks. B) Sponges. C) Amphibians. D) Arthropods. Show Answer Correct Answer: A) Mollusks. 4. Which of the following explains why having sunken stomata reduces the rate of transpiration? A) Less water molecules blown away gives a lower concentration gradient. B) More water molecules blown away gives a lower concentration gradient. C) Less water molecules blown away gives a higher concentration gradient. D) More water molecules blown away gives a higher concentration gradient. Show Answer Correct Answer: A) Less water molecules blown away gives a lower concentration gradient. 5. Cells that do not have a true nucleus are called ..... A) Eukaryote. B) Prokaryote. C) Unicellular. D) Multicellular. Show Answer Correct Answer: B) Prokaryote. 6. After the enzyme and substrate bind together and perform the reaction, what does the substrate become? A) A substrate. B) An enzyme. C) A product. D) An active site. Show Answer Correct Answer: C) A product. 7. A species that would cause a major change in an ecosystem if removed from that ecosystem A) Keystone species. B) Carrying capacity. C) Limiting factors. D) Resilience. Show Answer Correct Answer: A) Keystone species. 8. Which is the BEST description of biology? A) The study of humans and animals. B) The study of life and living things. C) The study of health care. D) The study of humans, plants, and animals. Show Answer Correct Answer: B) The study of life and living things. 9. Produces hormones and lipid molecules for cells A) Smooth endoplasmic reticulum. B) Rough endoplasmic reticulum. C) Nucleus. D) Ribosome. Show Answer Correct Answer: A) Smooth endoplasmic reticulum. 10. Holds the objectives, used to switch between magnifications (low, high, and scanning) A) Revolving nosepiece. B) Stage. C) Arm. D) Base. Show Answer Correct Answer: A) Revolving nosepiece. 11. If two different species in an ecosystem both feed on the same type of beetles, then these two species are called ..... A) Prey. B) Competitors. C) Mutualists. D) Parasites. Show Answer Correct Answer: B) Competitors. 12. What is 10% of 55, 000? A) 55, 000. B) 5, 500. C) 550. D) 55. Show Answer Correct Answer: B) 5, 500. 13. What forms the channels and pumps in the phospholipid bilayer? A) Carbohydrates. B) Proteins. C) Hydrophilic heads. D) Lipids. Show Answer Correct Answer: B) Proteins. 14. How do you calculate daily basic energy requirement (BER) A) 5.4*24*body mass (kg). B) 7.4*24*body mass(kg). C) 5.4*12*body mass (kg)?. D) None of above. Show Answer Correct Answer: A) 5.4*24*body mass (kg). 15. Modern classification is based on A) Structure. B) Habitat. C) Food eaten. D) Ecosystems. Show Answer Correct Answer: A) Structure. 16. Which of the organ of plant stated below is used to absorb water? A) Root. B) Flower. C) Stem. D) Leaves. Show Answer Correct Answer: A) Root. 17. BASIC UNIT OF CLASSIFICATION A) GENUS. B) FAMILY. C) KEY. D) SPECIES. Show Answer Correct Answer: D) SPECIES. 18. WHICH OF THE FOLLOWING IS NOT A SYMBIOTIC RELATIONSHIP A) MYCORRHIZA. B) LICHEN. C) ROOT NODULE WITH Rhizobium. D) Plasmodium in human host. Show Answer Correct Answer: D) Plasmodium in human host. 19. Which of the following genotypes is homozygous dominant? A) A. B) Aa. C) AA. D) Aa. Show Answer Correct Answer: C) AA. 20. In over 60% angiosperms pollen grains are shed at this stage ..... A) 3 celled. B) 2 celled. C) 7 celled 8 nucleate. D) 8 celled 7 nucleate. Show Answer Correct Answer: B) 2 celled. ← PreviousNext →Related QuizzesScience QuizzesBiology Quiz 1Biology Quiz 2Biology Quiz 3Biology Quiz 4Biology Quiz 5Biology Quiz 6Biology Quiz 7Biology Quiz 8Biology Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books