1. How does temperature act as an agent of physical weathering?
2. What are the major components of soil?
3. How does air act as the agents of weathering?
4. Plants and animals being the living organisms act as the agent of physical weathering. How?
5. Discuss the various horizons of soil profile.
6. On the basis of soil texture, soil is divided in to how many categories?
7. Define the terms :
ii. Soil density
8. Why are the earthworms known as nature’s ploughmen?
9. What is vermi-composting and how is it formed?
10. Compare the various properties of loamy soil, sandy soil & clayey soil.
11. Why does sandy soil need frequent irrigation?
12. What is soil profile?
13. How does water helps in weathering of rocks?
14. How is humus important for plants?
15. Why does soil of different areas differ in colour?
16. Which soil is considered best for the growth of plants? Why?
17. What are the different factors that affect the soil?
18. Differentiate between top soil and sub soil?
19. What are the different reasons for soil erosion?
20. We can make mud balls with clayey soil but not with sand. Why?
LESSON - 8 (TRANSPORTATION IN PLANTS)
1. Explain structure and functioning of heart.
2. What are the various functions of blood?
3. How does skin act as excretory organ in humans?
4. Define the terms:
5. What are the excretory organs in human? What are their functions?
6. What are the various organs consisting a circulatory system of an organism?
7. What are two processes responsible for transportation in organisms?
8. What are the conducting tissues of plant and why they are called as vascular tissues?
9. Make a diagram showing transpiration in plants.
10. Why is the outer wall of red blood cell flexible ?
L-9 (REPRODUCTION IN PLANTS)
1. Define the terms:
d. Vegetative reproduction
2. What is asexual reproduction? What are its various methods?
3. What are pollinators? Give examples.
4. Explain vegetative reproduction through leaves with example.
5. What are the characters of pollen grains?
6. What are the harmful effects of vegetative propagation?
7. How are the seeds dispersed by wind?
8. Why is apple termed as false fruit?
9. Explain the process of dispersal of fruits by explosion.
10. What is the difference between unisexual and bisexual flowers?
11. What do you understand by corms in plants? Give examples of such plants in which corms are found.
12. What is the special feature of the following seed which is helpful in their dispersal:
a. Seeds of drumstick
b. Seeds of Madar
c. Seeds of Xanthium and Urena
CLASS-VII ; LESSON - 5 (HEAT)
1. Explain why a stone feels very cold to bare feet in winters but a carpet in the same room feels warmer?
2. Why is digital thermometer preferred over mercury thermometer now a days?
3. Why is the box of solar cookers painted black from inside?
4. A metal ball just passes through a metal ring at room temperature. On heating the same metal ball does not passes through the ring. Explain why?
5. Why are ice boxes made as double walled?
6. What is radiant energy? What happens to it when it falls on any matter?
7. Why do houses have light colors on outer walls?
8. Why do firemen use shining brass caps?
9. Why do buildings have coated shining glass as their outer walls?
10. What is meant by land breeze?
11. When does the flow of heat from a hot object to a cold object stops?
12. Why is it better to wear dark clothes in winter?
13. What do you understand by normal human body temperature?
14. We want to keep cold water cold for long time in a container. State whether the container should be painted white or black from outside. Give reason.
15. Define the different methods of transfer of heat.
16. Why does the heat of the sun not reach us by conduction or by convection?
17. Name the two scales on which the temperature is measured.
18. Why do water pipes sometimes burst at very cold places?
19. Does the heat cause any chemical change? Give example.
20. What is the role of bricks and mud in keeping our houses cool?