Question 1

Q1: Plan a clean-up day at school or a nearby park. Wearing gloves and using bags, collect the litter you find. Discuss the kinds of waste you found. Whic...

Accepted Answer

This is a plan for an activity. A possible outcome and discussion would be: Plan: 1.  Organize a group of students and get permission from the school or local authorities. 2.  Arrange for safety gear (gloves) and materials (trash bags for different types of waste - recyclable and non-recyclable). 3....

Question 2

Q2: In Arunachal Pradesh, the Nyishi and Mishmi tribes treat the Tiger as sacred. In Chhattisgarh, the Baiga tribe worships Bagheshwar or Bagesur Dev and...

Accepted Answer

Another prominent example of an Indian community with a special bond with an animal is the Bishnoi community of Rajasthan.    Community: The Bishnois.    Animal: The Blackbuck (a type of antelope) and other wildlife, including the Chinkara and various birds. *   Special Bond: The Bishnoi faith, foun...

Question 3

Q3: Pick a tree near your home or school. Observe it once a week for 4 weeks. Note any new leaves, flowers, fruits, or visiting birds and insects. Record...

Accepted Answer

This is an observational activity. Here is a sample observation log for a Neem tree over four weeks. Name of Tree: Neem Tree Location: School Playground Observation Log:    Week 1: The tree has a full canopy of dark green, serrated leaves. There are no visible flowers or fruits. I observed several a...

Question 4

Q1: How might the loss of forest cover and changes in rainfall patterns lead to elephants to enter human farms and villages?

Accepted Answer

Based on the provided text, the reasons are as follows: 1.  Scarcity of Food and Water: The loss of forest cover due to deforestation for roads and buildings, combined with changes in rainfall patterns, leads to a shortage of vegetation and the drying up of waterholes in the elephants' natural habit...

Question 5

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 f...

Accepted Answer

If I were a tree in a dense forest, my relationships would be:    With Water: I would absorb water from the soil through my roots. Water is essential for me to perform photosynthesis and transport nutrients. My roots would also help hold the soil together and retain moisture in the ground, benefitin...

Question 6

Q3: Do you think the Earth can thrive without humans? Can humans survive without the earth?

Accepted Answer

Based on the principles discussed in the text:    Can the Earth thrive without humans?     Yes, the Earth could likely thrive, and in many ways, recover without humans. The text highlights that human activities such as deforestation, pollution, and overuse of resources disrupt the natural balance of...

Question 7

Q4: If two kinds of birds compete for the same fruit, how might their way of living change over time?

Accepted Answer

When two kinds of birds compete for the same fruit, their ways of living might change over time to reduce this competition. This is a key aspect of how ecosystems maintain balance. Possible changes include: 1.  Niche Partitioning: The birds might adapt their behaviors. For example, one species might...

Question 8

Q5: Can human actions cause natural disasters?

Accepted Answer

Yes, while human actions may not create the natural event itself (like a cyclone or an earthquake), they can significantly increase the severity and impact of these events, effectively turning them into major disasters. The text provides examples:    Increased Flood and Storm Damage: The text mentio...

Question 9

Q1: Refer to the given diagram (Fig. 12.19) and select the wrong statement. (i) A community is larger than a population. (ii) A community is smaller than...

Accepted Answer

Analysis of Ecological Levels: The text and the standard ecological hierarchy describe the levels of organization as follows:    Population: A group of organisms of the same species living in the same area (e.g., all the fish of one kind in a pond).    Community: All the different populations of dif...

Question 10

Q2: If all decomposers suddenly disappear from a forest ecosystem, what changes do you think would occur? Explain why decomposers are essential.

Accepted Answer

Changes that would occur if decomposers disappeared: 1.  Accumulation of Dead Organic Matter: Dead plants, animals, and waste products would not rot or decay. The forest floor would become covered in a thick layer of dead leaves, fallen trees, and animal carcasses. 2.  Nutrient Depletion: The nutrie...

Question 11

Q3: Selvam from Cuddalore district, Tamil Nadu, shared that his village was less affected by the 2004 Tsunami compared to nearby villages due to the prese...

Accepted Answer

Yes, the mangrove forests were indeed protecting Selvam's village. Here is an explanation based on the information in the text:    Natural Barriers: Mangrove forests grow along coastlines and have a very dense and complex network of roots and trees. This structure acts as a natural shield or barrier...

Question 12

Q4: Look at this food chain: Grass ⟶ Grasshopper ⟶ Frog ⟶ Snake If frogs disappear from this ecosystem, what will happen to the population of grasshoppers...

Accepted Answer

If frogs disappear from this food chain, it will disrupt the balance and affect the populations of both grasshoppers and snakes.    Effect on the Grasshopper Population:        What will happen: The population of grasshoppers will likely increase significantly.        Why: In this food chain, frogs...

Question 13

Q5: In a school garden, students noticed fewer butterflies the previous season. What could be the possible reasons? What steps can students take to have m...

Accepted Answer

Possible Reasons for Fewer Butterflies:    Lack of Food Source: There might have been fewer flowering plants that produce the nectar butterflies feed on.    Use of Pesticides: The use of chemical pesticides in the garden to control pests could have unintentionally harmed or killed the butterflies, t...

Question 14

Q6: Why is it not possible to have an ecosystem with only producers and no consumers or decomposers?

Accepted Answer

An ecosystem cannot be sustained with only producers (like plants) for two critical reasons related to the roles of consumers and decomposers: 1.  Role of Decomposers (Nutrient Cycling): This is the most critical reason. Producers obtain nutrients from the soil to grow. When these producers die, if...

Question 15

Q7: Observe two different places near your home or school (e.g., a park and a roadside). List the living and non-living components you see. How are the tw...

Accepted Answer

Here is a comparison of two common ecosystems: a park and a roadside. Ecosystem 1: A Park    Living (Biotic) Components: Trees, grass, shrubs, flowering plants, birds, squirrels, butterflies, bees, ants, earthworms, microorganisms in the soil.    Non-living (Abiotic) Components: Soil, sunlight, air,...

Question 16

Q8: 'Human-made ecosystems like agricultural fields are necessary, but they must be made sustainable.' Comment on the statement

Accepted Answer

This statement is accurate. Here's a comment based on the information in the text: Why Agricultural Fields are Necessary: Human-made ecosystems like farms are essential for human survival. As the global population has grown, we have become heavily dependent on agriculture to produce the vast quantit...

Question 17

Q9: If the Indian hare population (Fig. 12.20) drops because of a disease, how would it affect the number of other organisms?

Accepted Answer

A food web shows that organisms are interconnected, and a change in one population can affect many others. Although the specific food web is not shown, based on the principles in the text, a drop in the Indian hare population would have the following effects:    Effect on Predators: The Indian hare...

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