Question

6.
Ritika observes the living things in a pond and writes the following comment. “Water snails
love to eat the leaves of hydrilla. However, they have to hide from fish so that they are not
eaten by the fish."
After a few days, all the water snails disappear.
2. What could be the reason for the disappearance of the water snails?
b.
What will happen to the population size of hydrilla? Will it increase or decrease?​

Answer 1

All the water snails are disappeared due to decrease in amount of hydrilla leaves.

The population size of hydrilla decrease due to continuous consumption by snails.

Explanation:

• Food webs start with producers and end at the apex of predators in a food chain, which may be thought of as a linear type network. Then again, it keeps going, creating a loop. This food chain's major goal is to keep a balance necessary for survival. The equilibrium will collapse if there are any disturbances.
• In their natural environments, hydrilla populations often maintain a constant size throughout time. These populations neither get larger nor smaller; their growth rate hovers around zero.
• As has been the case with cod populations, populations can also shrink. The growth rate of the cod population is negative.

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Answer 2

Explanation:

All the water snails are disappeared due to decrease in amount of hydrilla leaves

the pollution size of hydrilla decrease due to continuous consumption by snails