Frame questions that can actually be checked — by an observation, a count, or a survey. Some you could ask after reading the opening page: How wide does an elephant corridor have to be, and who decides where it runs? Which crops are damaged most in villages near a forest, and in which month? If a corridor is protected, do fewer elephants enter farms in the years that follow? Which animals other than elephants use the same corridor? How much fodder and water does one adult elephant need in a day? Which trees in our own area are cut most often, and what replaces them? Try This: write each question on a slip, and next to it write how you would find the answer — a count, a map, an interview, or a library search. A question you cannot check is only an opinion.

NCERT Solutions Curiosity Chapter 12 Chapter opener — Probe and ponder

Book page 190 Updated on2026-09-05

Q1.

How might the loss of forest cover and changes in rainfall patterns lead to elephants to enter human farms and villages?

Answer

Because a forest that has shrunk and dried can no longer feed and water the elephants living in it, so they walk out to where food is.

The chapter sets the events out as a chain:

Rainfall and temperature change → vegetation is affected
Trees cut for roads and buildings → forests dry and shrink
Waterholes dry up → loss of habitat
Animals move into human habitats → crop damage, and at times harm to people and domestic animals

An elephant is a very large herbivore, so it needs a very large amount of fodder and water every single day. A farm or plantation offers exactly what a thinning forest no longer does — bananas and sugarcane standing close together, easy to reach. So the elephants are not straying at random; they are following the food.

Why it happens: elephants are adapted to forest life. Adaptation is slow — it builds up over many generations. Felling and a shifted monsoon change the forest in a few years, far faster than any adaptation can keep up with, so the animals must move instead. This is why wildlife ecologists identify and mark corridors: strips that connect one forest patch to the next, so elephants can travel between large forest areas without coming into contact with human settlements.

Q2.

Imagine you are a tree in a dense forest. What kind of relationships would you have with water, sunlight, other animals, and other components of the forest?

Answer

As a tree I am a producer, so almost every relationship in the forest either feeds me or feeds off me.

With sunlight, water and air (abiotic → biotic): I use sunlight, carbon dioxide and water to make my own food by photosynthesis, and release oxygen. Soil gives me a medium to stand in and the mineral nutrients I need.
With the soil and the air (biotic → abiotic): my roots hold the soil in place and prevent erosion, my shade and fallen leaves keep the soil moist, and the water I release helps cool the air around me. So I change the non-living parts as much as they change me.
With animals: deer and hares browse my leaves and seedlings; insects, birds and bats visit my flowers and pollinate them; birds and squirrels eat my fruits and drop the seeds far away, which is how my seedlings reach new ground; birds nest in my branches.
With other plants: I compete with neighbouring trees for sunlight, water and space — that competition is why forest trees grow tall and straight. An orchid may sit on my branch and take only support (commensalism), while a parasitic climber takes food from me and harms me (parasitism).
With microorganisms: when my leaves fall and when I finally die, fungi and bacteria break me down and return my nutrients to the soil, where the next tree will use them.

Tip: notice that the tree sits at the first trophic level. Every animal relationship above is really about energy that the tree first captured from the Sun.

Q3.

Do you think the Earth can thrive without humans? Can humans survive without the Earth?

Answer

The Earth can thrive without humans; humans cannot survive without the Earth.

Look at where the energy in any ecosystem comes from. It enters only at the producers, from sunlight, and then moves upward through consumers and back through decomposers into the soil. Humans are consumers. We take from that flow — we do not add anything to it. Remove us and the flow still closes on itself.

Now reverse the question. Everything we need is a benefit produced by ecosystems: forests give us fresh air, fertile soil, food, fibres, timber and medicines; aquatic ecosystems give us water and food; and ecosystems also give us places of beauty and recreation. None of these can be manufactured from nothing.

Why it happens: we are a part of the web, not outside it. That is exactly why the chapter warns that when we overuse or misuse natural resources, we disturb the balance in nature — the damage travels back to us through the same connections that supply us.

Q4.

If two kinds of birds compete for the same fruit, how might their way of living change over time?

Answer

Over time the two birds are likely to stop overlapping so completely — each shifts a little in what it eats, where it feeds, or when it feeds.

The reasoning is about supply and demand. One fruit crop can support only so many birds. If both kinds want the same fruit at the same time and place, each gets less; a bird that gets less food raises fewer young, so its numbers fall. The pressure eases only for a bird that finds a way of feeding the other is not using. Possible changes:

one feeds high in the canopy and the other on the lower branches;
one feeds early in the morning, the other later in the day;
one takes the small unripe fruits its beak can handle, the other the large ripe ones;
one moves to a different part of the habitat, or adds insects and nectar to its diet.

Why it happens: the chapter says that competition for shared resources helps control population size and keeps the ecosystem balanced. Without competition one species could multiply too much and unbalance the ecosystem. So competition is not only a struggle — it is one of the forces that keeps a community in a workable balance.

Q5.

Can human actions cause natural disasters?

Answer

Human actions can turn an ordinary natural event into a disaster, and can set off some disasters directly.

The chapter's own example makes this clear. The Sundarbans protect us by slowing down strong winds and waves during storms and floods. Selvam's village in Cuddalore district was less affected by the 2004 Tsunami than nearby villages because it still had its mangrove forest. Where the mangroves have been cut for fuelwood and farming, that shield is gone — the same wave now reaches houses and fields.

The same logic runs through the rest of the chapter:

Cut the trees on a slope and the roots no longer hold the soil in place, so ordinary rain now brings landslides and heavy silt into rivers.
Overuse synthetic fertilisers and the humus that binds soil particles falls; without enough humus soil becomes prone to erosion.
Harvest frogs on a large scale and agricultural pests rise — a crop failure caused entirely by us.

Did you know? The event (storm, wave, rain) is natural. Whether it becomes a disaster often depends on whether the ecosystem that used to absorb it is still there.

Q6.

Share your questions

Answer

Frame questions that can actually be checked — by an observation, a count, or a survey. Some you could ask after reading the opening page:

How wide does an elephant corridor have to be, and who decides where it runs?
Which crops are damaged most in villages near a forest, and in which month?
If a corridor is protected, do fewer elephants enter farms in the years that follow?
Which animals other than elephants use the same corridor?
How much fodder and water does one adult elephant need in a day?
Which trees in our own area are cut most often, and what replaces them?

Try This: write each question on a slip, and next to it write how you would find the answer — a count, a map, an interview, or a library search. A question you cannot check is only an opinion.

Was this helpful? Report an error