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#deep-sea

2 public questions tagged with this topic.

Bernoulli's Theorem and Applications

What ensures that a submarine can withstand high pressure at great depths?

The submarine’s rigid structure resists the external hydrostatic pressure (P = ρgh), which increases with depth, preventing collapse by balancing the inward force with structural strength. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Its rigid structure. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

Ref: NCBI Bookshelf, Ideal Gas Law: P1V1/T1 = P2V2/T2.

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Food Chain and Web

Which ecosystem is independent of solar energy?

The keyed cave response is only conditionally valid and conflicts with accepted ecology if interpreted generally. Most cave food webs depend on photosynthetically derived material carried in by water, wind, roots, or animals such as bats, so they are indirectly solar-dependent. Some caves host chemoautotrophic bacteria that oxidize sulfide, methane, ammonium, or ferrous iron and fix carbon without sunlight; those specific communities can support solar-independent food webs. The item therefore confuses absence of local light with independence from solar energy and should be flagged as a key mis

Ref: Fundamentals of Ecology, Odum & Barrett, 5th Ed., Ch. 3

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