CBSE Class 10 Biology - Our Environment Questions with Correct Answers

Biodegradable substances Correct Answer Are substances that can be broken down by the action of bacteria and other saprophytes Examples of biodegradable substances Correct Answer Cloth, paper and vegetables Non biodegradable substances are Correct Answer Substances which cannot be broken down by the action of bacteria and other saprophytes Examples of non biodegradable substances Correct Answer Glass, plastic and metal Producers Correct Answer Are green plants and algae that make their own food through photosynthesis Consumers Correct Answer Are organisms that depend on producers for food either directly or indirectly Decomposers Correct Answer Are microorganisms like bacteria and fungi which break down complex organic substances present in dead plant and animal matter into simple inorganic substances Trophic level Correct Answer The various levels or stages of a food chain at which the transfer of food takes place are called trophic levels Decomposes play a vital role in Correct Answer Recycling of materials and replenishment of the soils nutrients. They also help clean up our surroundings by decomposing dead organisms and wastes from plants and animals Primary consumers Correct Answer Are those who feed directly on the producers Secondary consumers Correct Answer Are carnivores who feed on plant eating organisms Tertiary consumers Correct