1. How many percent of water is needed by plants? A 90% B. 70% C. 80% D. 100% 2. Which of the following is a threat to healthy seedlings? A Weeds B. Fertilizer C. Water D. Wind 3. Which of the following insect pest that causes drying of the central shoot known as "dead heart"? A. Paddy stem borer B. Rice case worm C. Green leafhopper D. Thrips 4. What stage of a seedling plant required more water? A when the seedling is young B. when the seedling is mature C. When the seedling is 5ft . tall D. None of the above 5. What stage of a seedling plant required more water? A. When the seedling is young B. When the seedling is matured C. When the seedling is 5 feet tall D. All of the above 6. What type of soil needs more frequent watering? A. Sandy soil B. Clay soil C. Loam soil D. Silt soil 7. Which of the following insect pest that causes drying of the central shoot known as "dead heart"? A. Paddy stem borer B. Rice case worm C. Green leafhopper D. Thrips 8. What do you call the cutting of roots to control system development beyond the container? A. Root pruning B. Stem pruning C. Leaf pruning D. All of the above 9. When is the best time to water the plant? A. Early in the morning B. late in the afternoon D. A&B C. Noon time 10. What do you call to the process where the seedlings expose to harsh condition to make them strong? A. Hardening B. Postponing C. Weeding D. Wilting​