NCERT Solutions for Class 9 Science Chapter 15 Improvement in Food Resources In text Questions Page No: 141 1. What do we get from cereals, pulses, fruits and vegetables? Answer → Cereals provide us with carbohydrates. Also, they are a rich source of energy. → Pulses give us proteins. → Fruits and vegetables are a rich source of vitamins and minerals. A small amount of proteins, carbohydrates, and fats are also present in them. Page No: 142 1. How do biotic and abiotic factors affect crop production? Answer Biotic factors such as pests, insects and diseases reduce the crop production. A pest causes damage to our crops by feeding. Weeds also reduce crop productivity by competing with the main crop for nutrients and light. Similarly, abiotic factors such as temperature, wind, rain etc. affect the net crop production. For example droughts and floods have a great impact on crops sometimes, destroying the entire crop. 2. What are the desirable agronomic characteristics for crop improv...