Assignments – Term 2

Goodley Public School

Science VII

Transportation in Animals and Plants (A)

  1. Raghav was suffering from a wound infection. Suddenly his wound got filled with pus, what could be the possible reason for the problem? Explain
  2. Why heart is called a double pump?
  3. Write the functions of the following:
  • Platelets
  • Aorta
  • Xylem
  • Nephrons
  1. Humans sweat a lot more in summers than in winters. Why?
  2. Name he pigment that makes our blood red.

Light (A)

  1. Rainbow appears after heavy rainfall. How does it get formed?
  2. Why AMBULANCE is written inverted in front of an hospital vehicle?
  3. The distance between Raghav and the mirror in front of him is 10.5m; calculate the distance between him and his image.
  4. An object is brought very near to the concave side of a shining spoon. Write the characteristics of the image formed.
  5. Why convex mirrors are used in supermarkets and on metro platforms?
  6. State the laws of reflection.
  7. Describe the image formed by a pinhole camera.
  8. What is refraction?

Reproduction in plants and animals (A)

  1. Name an algae which undergoes fragmentation.
  2. Write two household purposes where yeast is used. Also explain the process of its reproduction.
  3. What is a sporangium?
  4. Name the vegetative parts of the following:
  • Asparagus
  • Begonia
  • Money plant
  • Cherry
  1. Grafting is a purposeful step for hybridization of plants. Explain.
  2. Draw a well labeled diagram of a cucumber flower.
  3. Butterflies are nature’s agent to reproduce beautiful and colorful flowers. Justify.
  4. Explain the dispersal of seeds of plants like pea & balsam.

Forests, Waste Water Management & Water – A Precious Resource (A)

  1. Mohan used his well to irrigate the fields. Over the years the well has dried up. Can you tell Mohan why this has happened?
  2. Cherrapunji in our country gets the maximum rainfall in the world but faces acute shortage of water. Why?
  3. What are dams? How are dams responsible for the availability of water for the entire year for a particular region?
  4. Why there is a need to conserve water? State methods that can be adopted to conserve water.
  5. Predict what would happen to the number of lions if al the rabbits suddenly disappeared from a forest.
  6. Explain briefly how energy flows through different levels in nature.
  7. Why sun is the ultimate source of energy?
  8. How do faulty sewer lines increase the risk of waterborne diseases?
  9. List out a few steps that you can adopt to control the generation of wastes.
  10. Why does the treatment of sewage in the secondary process speed up when aeration is improved?