A student went to study a local pond. In one part of the pond, she noticed tadpoles scraping at some pondweed. In another part, she saw a water beetle holding a tadpole in its jaws.

(a) Construct a food chain for the pond.

(b) How many links are there in this chain?

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Solution

(a) Weed → Tadpole → Water beetle
(b) There are three links in this food chain.

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Q. A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
(a) Construct a food chain for the pond.
(b) How many links are there in this chain?

An aquatic food chain comprises the organisms like tadpoles, weeds, fish and water beetles. The organisms which get the minimum energy through this food chain is:

(a) water beetles (b) tadpoles (c) weeds (d) fish

Q. Milo found some tadpoles in a pond and caught a few in a bottle. He grew those in a small glass water tank and supplied them with proper tadpole food. Despite all these efforts, the tadpoles never grew into adults. Which of the following can be a possible reason?

It was observed that the tadpoles are not growing into adult frogs in a village pond. A scientist who was asked to find the reason for this concluded that the pond water did not contain a sufficient amount of a mineral P which could make a hormone Q. The hormone Q can cause a phenomenon R in tadpoles so that they become adult frogs.

(a) What are (i) P (ii) Q, and (iii) R?

(b) Name one human disease which can also be caused due to the deficiency of P in the food and water.

Q. After the rain, tadpoles were found swimming in a pond but not the frogs. This is due to:

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A student went to study a local pond. In one part of the pond, she noticed tadpoles scraping at some pondweed. In another part, she saw a water beetle holding a tadpole in its jaws. (a) Construct a food chain for the pond. (b) How many links are there in this chain?

(a) Weed → Tadpole ​​​​​​​→ Water beetle (b) There are three links in this food chain.

A student went to study a local pond. In one part of the pond, she noticed tadpoles scraping at some pondweed. In another part, she saw a water beetle holding a tadpole in its jaws.

(a) Construct a food chain for the pond.

(b) How many links are there in this chain?

(a) Weed → Tadpole → Water beetle
(b) There are three links in this food chain.