Introduction to Pomology MCQs (Quiz 19) Posted on July 25, 2026Author agropublishers 0 1. Plant growth regulator _________________ is often used in stone fruits like peaches to promote fruit thinning and improve final fruit size Naphthalene acetic acid Ethephon Gibberellic acid Abscisic acid 2. Leaves function as the primary ________ by producing carbohydrates through photosynthesis Flowers Sources Sinks Buds 3. Glyphosate inhibits biosynthesis of ______________ Glutamine Phenylalanine Cysteine Alanine 4. __________________ are the main branches in trees that grow straight out from the trunk to form the primary framework of the tree canopy Scaffolds Spurs Twigs Lateral branches 5. The fruit-bearing upper portion of a grafted plant is called the ______________ Scion Rootstock Cambium Stockion 6. In apple orchards, which PGR is commonly used to chemically thin fruitlets shortly after bloom to manage crop load? 6-benzyladenine (6-BA) Abscisic acid (ABA) Ethephon Gibberellic acid (GA3) 7. In fruit plants, sink demand for photosynthates is highest during __________________ Dormancy Leaf fall Active fruit growth Seed storage 8. Photosynthate translocation is the movement of carbohydrates from leaves to developing fruits and occurs through the _____________________ Phloem Cambium Epidermis Xylem 9. ________________ is a thin, actively dividing layer of cells located between the wood and the inner bark that drives secondary growth by producing new xylem inward and new phloem/bark outward Cambium Inner bark Heartwood Outer bark 10. In the source–sink relationship, mature leaves are classified as _______________________ Strong sources Dormant tissues Storage organs Strong sinks Loading … Question 1 of 10