General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
231
UNCED stands for:
Answer:
United Nations Conference on Environment and Development
UNCED, the 1992 Rio Earth Summit, produced Agenda 21 and key conventions on climate and biodiversity. It set a global sustainable development agenda. It is a cornerstone in environmental diplomacy.
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232
Salmonellosis is a disease associated with consumption of contaminated:
Answer:
disease associated with consumption of contaminated:
Salmonella commonly contaminates eggs and poultry; undercooked eggs pose a classic risk. Chicken is also a common vector, but exams often emphasize eggs. Proper cooking and hygiene reduce infection.
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233
Catfish that feed on the muddy bed of lakes are:
Answer:
atfish that feed on the muddy bed of lakes are:
Bottom feeders forage on or in sediments, consuming detritus and benthic organisms. “Mud feeders” is informal; “bottom feeders” is the standard ecological term. Catfish have barbels adapted for such feeding.
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234
The simplest aquatic ecosystem can be seen in a:
Answer:
Pond
Ponds are small, relatively self-contained systems with clear trophic structure (producers, consumers, decomposers). Rivers and lakes are larger and more complex. Tanks vary and may be artificial with variable biota.
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235
“Web of life” refers to:
Answer:
Interlinked chain of food relations
The web of life denotes the interconnectedness of species via feeding relationships and dependencies. It’s broader than a single energy or nutrient cycle. Disturbing one node can ripple through the network.
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236
“Root zone process” (root ozone in prompt) refers to:
Answer:
A control measure to prevent water pollution
Root Zone Treatment (constructed wetlands) uses plant roots and microbial biofilms to treat wastewater naturally. It removes nutrients and organics before discharge/reuse. It’s widely used in eco-sanitation.
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237
Total water content of soil is termed:
Answer:
Holard
Holard is total soil water. Chresard is the available fraction usable by plants; echard is unavailable (hygroscopic/capillary held too strongly). These terms parse soil water status.
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238
Plants that grow in **light** (full sun) are called:
Answer:
Heliophytes
Heliophytes require high light and exhibit sun-leaf traits. Sciophytes are shade-adapted. Oxylophytes prefer acidic soils; epiphytes live on other plants.
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239
The major reservoir of carbon is:
Answer:
Rocks (lithosphere)
Most carbon is stored in sedimentary rocks as carbonates. Oceans also hold vast carbon, and the atmosphere/biota hold much less. Geological reservoirs dominate long-term storage.
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240
The natural source of energy for Earth is the:
Answer:
Sun
Solar radiation powers photosynthesis and climate. Lightning is a transient electrical discharge, not a sustained energy source. Distant stars contribute negligible energy at Earth.
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