Grade 4 General Science Chapter 2 – Solved Exercise

Grade 4 General Science Chapter 2 – Solved Exercise. Ace Your Exams with Our Solved Exercise Facility! This valuable Grade 4 General Science – Chapter 2 Solved Exercises resource provides students and teachers with step-by-step solutions and clear explanations to chapter exercises, covering topics like the characteristics of living things, ecosystems, and more. Reinforce your understanding and master challenging concepts with our easy-to-follow answers. Boost your learning journey today with our solved exercise facility!

Grade 4 General Science Chapter 2 – Solved Exercises

1. Tick (√) the correct answer.
   1. What is an ecosystem?
      • System of non-living things is an environment.
      • System of living things in an environment.
      • Area having a group of living and dead things.
      • The collection of biotic and abiotic components in an area.
   2. All the biotic components are:
      • Animals
      • Producers
      • living things
      • non-living things
   3. Food chain:
      • begins with producer.
      • begins with consumer
      • begins with decomposer
      • non-living things
   4. For the conservation of ecosystem:
      • forests are being cut
      • roads are being built
      • tree plantation is being done
      • factories are being installed
   5. If insecticides are used for controlling the population of insects, the population of birds will:
      • • Increase
        • Decrease
        • increase first, then will decrease later
        • decrease first then will increase later
2. Write short answers.
   1. 1. Define environment.
         • The living and non-living components of an environment make the ecosystem.
      2. Write the names of three abiotic components of an ecosystem.
         • The abiotic components are air, light and soil
      3. Write the names of three biotic components of an ecosystem.
         • Producers, consumers, and decomposers are the biotic components of an ecosystem.
      4. Draw a simple food chain.
         • Plant → Grasshopper → Rat → Owl
      5. If the food resources increase, what will be the effect on the population of predators?
         • More prey animals: Increased food resources will generally lead to a larger population of prey animals, such as herbivores
         • Greater predator survival: With more prey available, predators will have an easier time finding food, which improves their chances of survival and reproduction
      6. Write two human activities which are affecting the ecosystem.
         • The increase in human population along with cutting down of forests are two human activities that negatively affect the ecosystem.
3. Constructed Response Questions:
   1. What is the relationship between biodiversity and competition among living things in a balanced ecosystem?
      • Variety of Resources: A diverse ecosystem offers a wider range of resources, like food and shelter. Different species can specialize in using different resources, reducing direct competition for the same things.
      • Predator-Prey Balance: Biodiversity helps maintain a balance between predators and prey. If there are many kinds of prey animals, a predator won’t wipe out any single species, keeping the ecosystem stable.
4. Investigate:
   • • The ostriches are the tallest and heaviest birds, but they cannot fly in order to escape from their predator, they fight with their strong claws or runaway with a speed of 70 kilometer per hour. The light brown colored females lay eggs and sit on them at the day time. The black colored male ostrich warms eggs at night.
       • Why does female ostrich warm eggs at day time?
         • Female ostriches have light brown feathers that allow them to blend in with the surrounding environment during the day.1 This camouflage helps protect the eggs from predators while she sits on them.
       • Why does male ostrich warm eggs at night?
         • Male ostriches have black feathers that help them blend in with the darkness of night. This camouflage protects the eggs from predators while the male sits on them.

Project: Make an ecosystem model using abiotic and biotic components of ecosystem.

• This project requires at least two bottles. Pour some water in the first bottle to show aquatic ecosystem. Put soil and a small plant in the second bottle to show land ecosystem. Connect both of the bottles so that the plant may receive water and minerals. Observe the model and write a report of the results.