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