The question asks to identify the type of food chain that begins with dead organic matter. We need to understand the definitions of different food chains to determine the correct option.
B) Detritus food chain — A detritus food chain begins with dead organic matter (detritus) and is composed of decomposers (bacteria, fungi) and detritivores (e.g., earthworms, mites) that feed on this dead material. This is distinct from a grazing food chain, which starts with living producers.
UPSC - 2022
The question asks about the application of "Biorock technology". This requires knowledge of what Biorock technology is and its primary use. Biorock technology is a specific method used in marine conservation.
Correct Option: A) Restoration of damaged coral reefs
The question asks about the primary energy source for first-level consumers in a grazing food chain. Understanding the definition of a grazing food chain and the trophic levels within it is key to answering this question.
C) Living plant biomass
In a grazing food chain, the energy flow begins with producers, which are typically green plants. First-level consumers, also known as primary consumers or herbivores, feed directly on these living plants. Therefore, the living plant biomass is their main source of energy.
The question asks to identify which of the given organisms act as pollinating agents. Pollination is the process by which pollen is transferred from the anther (male part) to the stigma (female part) of a flower, enabling fertilization and reproduction. Pollinating agents can be abiotic (wind, water) or biotic (animals).
D) 1, 2 and 3. All the listed organisms (Bat, Bee, and Bird) are recognized as significant pollinating agents in different ecosystems.
The question asks to identify which of the given organisms (Bacteria, Fungi, Flowering plants) are used as biopesticides. Biopesticides are naturally occurring substances or organisms that control pests. We need to evaluate each category to determine its role in pest control.
D) 1, 2 and 3 — All three categories (Bacteria, Fungi, and Flowering plants) include species or their derivatives that are used as biopesticides. Bacteria like Bacillus thuringiensis, fungi like Beauveria bassiana, and extracts from flowering plants like neem or pyrethrum are all examples of biopesticides.
The question asks to identify the true statement about a food web. We need to understand the basic definition and characteristics of a food web to evaluate each option.
B) It provides multiple pathways for energy flow. This is the defining characteristic that distinguishes a food web from a food chain. The interconnectedness of various food chains within an ecosystem creates a complex network of energy transfer routes.