Skip to content

Answer the following. (Class 10 Science 2023, Q33a)

questionbuddy.in/q/cbse-10-science-2023-31-1-1-q33a

ScienceCBSE Class 10 · Board exam 2023, set 31/1/1 · 3 marks · Short answer

CBSE Class 10 Science 2023: question 33(a)

Set in the CBSE Class 10 board exam of 2023, paper 31/1/1, section C, question 33(a), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q33(a) · 3 marks · Short answerCompetency-basedOur Environment

Answer the following.

  1. (i)

    Why does a kitchen garden called an artificial ecosystem while a forest is considered to be a natural ecosystem ?

    0 marks
  2. (ii)

    While designing an artificial ecosystem at home, write any two things to be kept in mind to convert it into a self-sustaining system. Give reason to justify your answer.

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Who looks after a kitchen garden, and who looks after a forest?

Hint 2

For a self-sustaining aquarium, think about what the fish need to breathe and to eat.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (i) A kitchen garden is made and maintained by humans: they choose the plants and supply water, manure and care. It cannot sustain itself, so it is an artificial ecosystem. A forest develops and maintains itself naturally, without human help, so it is a self-sustaining natural ecosystem.

    1 mark

  2. (ii) Example: an aquarium. Things to keep in mind:
    1. Supply oxygen, using an aerator or pump, or ensure enough light for the plants.
    2. Add aquatic plants (producers) along with animals (consumers) such as fish, and allow decomposers to be present.

    1 mark

  3. Justification: The oxygen supply is replenished continuously for the organisms to respire. The aquatic plants make food by photosynthesis and serve as food for the animals, while decomposers recycle wastes into nutrients. So all the components needed for energy flow and nutrient cycling are present, and the system becomes self-sustaining.

    1 mark

Answer: (i) A kitchen garden is man-made and maintained by humans (non-sustainable), while a forest is maintained by nature (self-sustaining); (ii) e.g., an aquarium with a continuous oxygen supply and aquatic plants as producers, so oxygen is replenished and the plants provide food.

Where the marks are

  • Distinguishes man-made and maintained (kitchen garden) from naturally self-sustaining (forest) (1 mark)
  • Two correct requirements, e.g., oxygen supply and aquatic plants with animals (1 mark)
  • Valid justification: oxygen replenished and plants serve as food (1 mark)

Revise the chapter

  • Chapter: Our Environment (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Our Environment, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 31/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.