NCERT Class 9 Science Chapter 11 Earth as a System: Energy, Matter and Life Solutions
NCERT Class 9 Science Chapter 11 Earth as a System: Energy, Matter and Life Solutions Think It Over (Page No. 208) 1. When does a farmer prefer asexual or sexual methods of reproduction for crops production? Answer: Asexual Reproduction is preferred when: The farmer wants to produce genetically identical plants with the same desirable traits, such as taste, yield, or disease resistance. Rapid, large-scale propagation is needed using methods like cutting, grafting, layering, and tissue culture. Growing crops like sugarcane, potato, ginger, and banana where seeds are not required. Tissue culture helps produce virus-free, healthy plantlets ensuring high yields, as seen in banana farming. Sexual Reproduction is preferred when: The farmer wants to develop new and improved varieties through cross-pollination or artificial hybridisation. Disease-resistant or high-yielding varieties need to be created through selective breeding or genetic engineering. Growing seed-based crops like wheat, maiz...