N.C.E.R.T. Simplified

Ch. 5 The Fundamental Unit of Life Ch. 6 Tissues Ch. 15 Improvement in Food Resources

Q. List 2 demerits of the continuous use of fertilisers. A. 1. It can destroy the soil fertility because the organic matter in the soil is not replenished.       2. The microorganisms in the soil are harmed. Q. How do insects and pests damage crops? A. Generally, insect pests attack the plants in 3 ways-     1. They cut the root, stem, and leaves.     2. They suck the cell sap from various parts of the plant.     3. They bore into the stem and fruits. They thus affect the health of the crop and reduce yields. Q. How can insects pests in a crop plants and stored grains be controlled? A. They can be controlled by-     1. By using pesticides ( herbicides and insecticides). These are sprayed on crop plants or used for treating soil and seeds.     2. By using resistant varieties of crops     3. By summer ploughing in which fields are ploughed deep in summer...

Q. Make comparison between functions of tissues in plants and animals ? A. PLANT TISSUES ANIMAL TISSUES Dead supportive tissues are more abundant as compared to living tissues. Living tissues are more common as compared to dead tissues. They require less maintenance. They require more maintenance. Due to activity of meristematic tissue plants grow throughout life. Do not show growth after reaching maturity. Tissue organisation is meant for stationary habit for plants. Tissue organisation is targeted towards high mobility of animals Growth is limited to certain regions. There is uniform growth. Based on their dividing capacity plant tissues are classified into meristematic or permanent. There is no demarcation of dividing tissues in animals. Q. What are the different types of meristematic tissues? Where are the located in a plant and how do they bring about growth in pl...