GATE GG-1 2025 Paper 1 — page 14

Questions 40–42 of 65. Imported answers require review unless explicitly marked reviewed.

Which of the following statements regarding marine organisms is/are NOT true?

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Foraminifera are multicellular marine organisms

Sponges form their spicules with silica

Coccolithophores are sea-surface dwelling organisms

Species diversity of benthic foraminifera is less than that of planktonic foraminifera

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Which of the following rocks is/are characteristic of fossil subduction zones?

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Wollastonite and scapolite bearing skarn

Andalusite and staurolite bearing hornfels

Garnet and glaucophane bearing blueschist

Garnet and omphacite bearing eclogite

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Compared to Fe, Mg, and Ca, the content of K is extremely low in igneous clinopyroxene. Which of the following CANNOT explain its low abundance?

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K⁺ has a larger ionic radius than Fe²⁺, Mg²⁺ and Ca²⁺

K is incompatible and hence, enriched in the continental crust

K is fluid mobile and hence, easily leached out of clinopyroxene

K has multiple oxidation states

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2025 · Paper 1