Assignments – Term 2
Goodley Public School
Science VII
Transportation in Animals and Plants (A)
- Raghav was suffering from a wound infection. Suddenly his wound got filled with pus, what could be the possible reason for the problem? Explain
- Why heart is called a double pump?
- Write the functions of the following:
- Platelets
- Aorta
- Xylem
- Nephrons
- Humans sweat a lot more in summers than in winters. Why?
- Name he pigment that makes our blood red.
Light (A)
- Rainbow appears after heavy rainfall. How does it get formed?
- Why AMBULANCE is written inverted in front of an hospital vehicle?
- The distance between Raghav and the mirror in front of him is 10.5m; calculate the distance between him and his image.
- An object is brought very near to the concave side of a shining spoon. Write the characteristics of the image formed.
- Why convex mirrors are used in supermarkets and on metro platforms?
- State the laws of reflection.
- Describe the image formed by a pinhole camera.
- What is refraction?
Reproduction in plants and animals (A)
- Name an algae which undergoes fragmentation.
- Write two household purposes where yeast is used. Also explain the process of its reproduction.
- What is a sporangium?
- Name the vegetative parts of the following:
- Asparagus
- Begonia
- Money plant
- Cherry
- Grafting is a purposeful step for hybridization of plants. Explain.
- Draw a well labeled diagram of a cucumber flower.
- Butterflies are nature’s agent to reproduce beautiful and colorful flowers. Justify.
- Explain the dispersal of seeds of plants like pea & balsam.
Forests, Waste Water Management & Water – A Precious Resource (A)
- Mohan used his well to irrigate the fields. Over the years the well has dried up. Can you tell Mohan why this has happened?
- Cherrapunji in our country gets the maximum rainfall in the world but faces acute shortage of water. Why?
- What are dams? How are dams responsible for the availability of water for the entire year for a particular region?
- Why there is a need to conserve water? State methods that can be adopted to conserve water.
- Predict what would happen to the number of lions if al the rabbits suddenly disappeared from a forest.
- Explain briefly how energy flows through different levels in nature.
- Why sun is the ultimate source of energy?
- How do faulty sewer lines increase the risk of waterborne diseases?
- List out a few steps that you can adopt to control the generation of wastes.
- Why does the treatment of sewage in the secondary process speed up when aeration is improved?