Light: Shadows and Reflections — Science STD 7 — Question

How does a periscope help us see things not in direct line of sight?

How are different fields of science interconnected?

The process of digestion is a chemical change. Explain.

Fill in the blanks in the given passage: The rainwater and ________________ from other sources such as rivers and ponds seeps through the ______________ and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called ______________.

What are stomata? Give two functions of stomata.

How is transpiration and translocation different from each other.

Why should we not taste unknown substances during experiments?

Wild animals like tiger, wolf, lion and leopard do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation?

What is respiration in plants? How is it different from photosynthesis? Explain the importance of both processes.

One morning as Paheli strolled in her garden she noticed many small plants which were not there a week ago. She wondered where they had come from as nobody had planted them there. Explain the reason for the growth of these plants.