MCQs Plant Breeding and Genetics-49 Posted on 2025-11-16Author admin 0 1. Identify the correctly matched pair. Ginger – Rhizome Garlic – Tuber Potato – Corm Banana – Bulb 2. The Extinction Vortex refers to __________. The rescue of endangered species A positive feedback loop leading small populations to extinction Hybrid populations gaining fitness The stabilization of allele frequencies 3. ________________ refers to the evolutionary process by which new species arise Macroevolution Microevolution Speciation Natural selection 4. Nastic movements differ from tropic movements because they———- Are irreversible Involve cell death Depend on stimulus direction Are independent of stimulus direction 5. The reduction of chromosome number from 2n to n occurs during_______________ Meiosis II Cytokinesis Interphase Meiosis I 6. Identify the incorrectly matched pair Onion – Bulb Carrot – Stem tuber Banana – Sucker Ginger – Rhizome 7. The ______ is the outer, tough, and resistant layer of a pollen grain Nucellus Cytoplasm Exine Intine 8. The main purpose of mitosis is to _________ Reduce chromosome number Introduce genetic variation Maintain chromosome number Produce gametes 9. The first chemical mutagen ever discovered was __________ Nitrosoguanidine (MNNG) Ethyl methanesulfonate (EMS) Mustard gas (Sulfur mustard) 5-Bromouracil (5-BU) 10. Meiosis is a specialized type of cell division that occurs only in ———– Germ cells Stem cells Somatic cells All dividing cells Loading …
