This quiz works best with JavaScript enabled. Home > Plant Diseases > Identification > Plant Diseases – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Plant Diseases Quiz 1 (20 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) Reduce the spread of pathogens. B) So other people don't eat them. C) So children don't pick at the plant. D) So the pathogens can spread. Show Answer Correct Answer: A) 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) Nitrates. B) Toffee. C) Oxygen. D) Nitrogen. Show Answer Correct Answer: C) Oxygen. Next →Related QuizzesPlant Diseases QuizzesPlant Diseases Quiz 2Plant Diseases Quiz 3 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books