I. MULTIPLE CHOICE. Encircle the letter of the correct answer. 1. Which of the following is considered a biotic component? a. Sunlight b. Moisture c. Endangered species d. Water 2. Which of the following are the three categories of biotic factors? a. Producer, weather, and consumer b. Producer, consumer, and decomposer c. Producer, weather, and decomposer d. Weather, consumer, and decomposer 3. Which of the following best describes the biotic and abiotic components? a. All biotic components can produce their own food while abiotic cannot. b. All biotic components depend on abiotic while abiotic do not depend on biotic. c. All biotic components cannot be found in an ecosystem while abiotic is present in an ecosystem. d. All biotic and abiotic components are living components in an ecosystem. 4. One of the abiotic factors is the radiant energy from the sun. What do you think will happen to biotic components without this energy? a. All biotic components can still survive because water, temperature, and oxygen are still present. b. All biotic components can still survive because the sun can be replaced by the moon. c. All biotic components cannot survive because plants cannot process their food. d. All abiotic components cannot survive because there is no source of energy. 5. In planting, it is important to consider the type of soil. In what type of soil do you think garden plants will grow best? a. Sandy soil b. Nutrient-rich soil c. Sprayed by pesticide soil d. Loamy soil 6. Mangroves and fishes are living organisms that can be found in a marine ecosystem. Which of the following does not contribute to the survival of mangroves and fishes for the said ecosystem? a. Sunlight b. Oxygen
The Correct Answer and Explanation is:
- Answer: c. Endangered species
Explanation: Biotic components of an ecosystem refer to the living organisms such as plants, animals, fungi, and bacteria. Endangered species are living organisms that are part of the ecosystem, so they fall under the category of biotic components. Sunlight, moisture, and water, on the other hand, are abiotic (non-living) factors, as they don’t have life. - Answer: b. Producer, consumer, and decomposer
Explanation: The three primary categories of biotic factors are producers, consumers, and decomposers. Producers (like plants) create their own food through photosynthesis, consumers (such as herbivores, carnivores, and omnivores) rely on other organisms for food, and decomposers (like fungi and bacteria) break down dead organisms and organic waste. Weather is an abiotic factor, not a biotic one, and is not involved in these categories. - Answer: b. All biotic components depend on abiotic while abiotic do not depend on biotic.
Explanation: Biotic components depend on abiotic factors such as water, air, temperature, sunlight, and nutrients to survive. For instance, plants (biotic) need sunlight (abiotic) for photosynthesis, and animals (biotic) need oxygen (abiotic) to breathe. However, abiotic factors do not depend on biotic components. Abiotic factors like sunlight and water exist regardless of the presence of living organisms. - Answer: c. All biotic components cannot survive because plants cannot process their food.
Explanation: Sunlight is a crucial abiotic factor for plants, which perform photosynthesis to make their own food. Without sunlight, plants would not be able to produce the energy needed for growth, and consequently, the entire food chain would be disrupted. If plants can’t grow, herbivores that depend on them for food would also struggle to survive, affecting all higher trophic levels (consumers and decomposers). - Answer: d. Loamy soil
Explanation: Loamy soil is the best type of soil for most garden plants. It has a balanced mixture of sand, silt, and clay, making it well-draining yet capable of holding nutrients and moisture. Nutrient-rich soil, while beneficial, can be a bit too heavy and may retain too much moisture, which could lead to root rot. Sandy soil does not hold nutrients or water well, and pesticide-sprayed soil can harm plants and beneficial organisms. - Answer: b. Oxygen
Explanation: Oxygen is essential for respiration in most organisms, including fishes. However, mangroves and fish in a marine ecosystem rely on various abiotic factors such as sunlight (for photosynthesis and food production) and water (for the survival of aquatic life). While oxygen is necessary for fish respiration, it is not directly related to the survival of mangroves. Sunlight, temperature, and salinity are more crucial factors for mangrove survival in marine ecosystems.
