This quiz works best with JavaScript enabled. Home > Agriculture > Plant Diseases > Identification > Plant Diseases – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Plant Diseases Quiz 1 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which one of the following statements is true? A) Resistant varieties of plants resist all diseases common to the species. B) A plant bred for specific disease resistance will never get that disease. C) A disease does not readily infect resistant plants unless factors are favorable. D) Resistant plants can develop immunity to a disease after they are exposed to it. Show Answer Correct Answer: C) A disease does not readily infect resistant plants unless factors are favorable. 2. Tannins are an example of what type of defence? A) Physical. B) Passive Chemical. C) Active Chemical. D) None of above. Show Answer Correct Answer: B) Passive Chemical. 3. What is waterproof and indigestible? A) Layer of dead skin. B) Leaves falling of. C) Waxy cuticle. D) Cellulose cell wall. Show Answer Correct Answer: D) Cellulose cell wall. 4. Why do plants infected with TMV have stunted growth? A) TMV kills new cells. B) TMV causes water loss, causing the plant to shrink. C) The plant is unable to photosynthesise. D) None of above. Show Answer Correct Answer: C) The plant is unable to photosynthesise. 5. Plants have cellulose walls - what type of defence mechanism is this? A) Physical. B) Chemical. C) Mechanical. D) None of above. Show Answer Correct Answer: A) Physical. 6. What is the result of nitrate deficiency in a plant A) Cellulose walls are strengthened. B) Increased growth. C) Yellowing of the leaves. D) Stunted growth, older leave may go yellow. Show Answer Correct Answer: D) Stunted growth, older leave may go yellow. 7. The glucose made in photosynthesis is ..... A) Converted into insoluble substances like oils, fats and starch for storage. B) Used in respiration to release energy. C) Converted into other substances in plants. For example:Cellulose for cell walls Proteins for growth and repair. D) All of the above. Show Answer Correct Answer: D) All of the above. 8. Symptoms of anthracnose include: A) Dead areas on leaves usually along leaf margins and veins. B) Localized areas of dead bark and underlying wood on twigs, branches, and trunks. C) Root tips that are brown and dead. D) A dry, powdery, reddish-orange substance on leaves. Show Answer Correct Answer: A) Dead areas on leaves usually along leaf margins and veins. 9. Antibiotics can be used to treat what type of infection? A) Fungal. B) Viral. C) Bacterial. D) None of above. Show Answer Correct Answer: C) Bacterial. 10. How does TMV damage a plant? A) They reduce the area for photosynthesis. B) They destroy cells. C) They act as a vector, transferring viruses, bacteria and fungi between the plants. D) They prevent plants from acquiring the water and minerals it needs. Show Answer Correct Answer: B) They destroy cells. 11. Which of the following are entry points for bacteria? A) Mechanical injuries and woulds made by insect feeding. B) Spores. C) Stomata and nectaries. D) Both mechanical injuries, wounds from insect feeding, stomata, and nectaries. Show Answer Correct Answer: D) Both mechanical injuries, wounds from insect feeding, stomata, and nectaries. 12. Farmers will often spray plants with pesticides, why? A) So children don't pick at the plant. B) Reduce the spread of pathogens. C) So other people don't eat them. D) So the pathogens can spread. Show Answer Correct Answer: B) Reduce the spread of pathogens. 13. What is the result of magnesium deficiency in a plant A) Cellulose walls are strengthened. B) Increased growth. C) Yellowing of the leaves. D) Stunted growth. Show Answer Correct Answer: C) Yellowing of the leaves. 14. Why do mint plants smell minty? A) Antibacterial chemicals. B) Poisons. C) Pathogens. D) None of above. Show Answer Correct Answer: A) Antibacterial chemicals. 15. How does black spot damage a plant? A) They reduce the area for photosynthesis. B) They destroy cells. C) They act as a vector, transferring viruses, bacteria and fungi between the plants. D) They prevent plants from acquiring the water and minerals it needs. Show Answer Correct Answer: A) They reduce the area for photosynthesis. 16. Viral diseases can be transferred from plant to plant by: A) Vegetative propagation. B) Mites, nematodes, and thrips. C) Hands and tools. D) All of these. Show Answer Correct Answer: D) All of these. 17. Which of the following is a chemical plant defence? A) Producing antibacterial substances. B) Thorns and spikes. C) Layers of dead cells. D) Mimicry. Show Answer Correct Answer: A) Producing antibacterial substances. 18. Stomatal closure is an example of what type of defence? A) Physical. B) Passive Chemical. C) Active Chemical. D) None of above. Show Answer Correct Answer: A) Physical. 19. What is the name of a growth that blocks the xylem? A) Callose. B) Lignin. C) Tylose. D) None of above. Show Answer Correct Answer: C) Tylose. 20. As well as Glucose what is the second product of photosynthesis? A) Toffee. B) Nitrogen. C) Oxygen. D) Nitrates. Show Answer Correct Answer: C) Oxygen. 21. Some glucose is used by plants to produce Proteins examples of proteins are A) Starch and Fatty Acids. B) Chlorophyll and Starch. C) Starch and Enzymes. D) Enzymes and Chlorophyll. Show Answer Correct Answer: D) Enzymes and Chlorophyll. 22. Which of the following are ways to identify plant diseases? A) Using a gardening manual. B) Take infected plant to be tested in a lab. C) Using monoclonal testing kits. D) All of the above. Show Answer Correct Answer: D) All of the above. 23. What is needed to make chlorophyll? A) Magnesium. B) Photosynthesis. C) Magnesum. D) None of above. Show Answer Correct Answer: A) Magnesium. 24. What benefit does lignin provide? A) It is waterproof. B) It strengthens the cell membrane. C) It is antibacterial. D) None of above. Show Answer Correct Answer: A) It is waterproof. 25. What can insects do to a plant? A) Turn Leaves Yellow. B) Stunt growth. C) Damage the stem and leaves. D) Drop Leaves Early. Show Answer Correct Answer: C) Damage the stem and leaves. 26. What are the advantages of using insoluble substances such as starch for storage, rather than soluble substances such as glucose A) They do not affect the water concentration inside cells. B) They do not move away from the storage areas in the plant. C) Both are correct. D) Neither are correct. Show Answer Correct Answer: C) Both are correct. 27. What is the function of a physical defence? A) Prevent entry and spread of a pathogen. B) Kill a pathogen. C) Deter a pathogen. D) None of above. Show Answer Correct Answer: A) Prevent entry and spread of a pathogen. 28. What 3 factors are limiting factors of photosynthesis? A) Temperature, Water, Light intensity. B) Carbon dioxide concentration, Temperature, Light intensity. C) Carbon dioxide concentration, Temperature, Water. D) Carbon dioxide concentration, Oxygen concentration, Water. Show Answer Correct Answer: B) Carbon dioxide concentration, Temperature, Light intensity. 29. When a plant responds to a pathogen by signalling other parts of the plant to prepare for infection by the pathogen. A) Hypersensitive response. B) Systemic Acquired response. C) Barrier Defenses. D) Cytokine Storm. Show Answer Correct Answer: A) Hypersensitive response. 30. Addition of lignin to cell walls is an example of what type of defence? A) Physical. B) Passive Chemical. C) Active Chemical. D) None of above. Show Answer Correct Answer: A) Physical. Next →Related QuizzesPlant Diseases QuizzesAgriculture QuizzesPlant Diseases Quiz 2 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books