The process of movement of molecules from high to low concentration without energy is:
A. Endocytosis
B. Active transport
C. Passive diffusion
D. Osmosis
Answer: Option C
Solution (By JKSSB Mock Tests)
Passive diffusion is the net movement of molecules down their concentration gradient without energy. Osmosis is water diffusion, active transport uses energy, endocytosis is vesicular uptake.
Explanation:
Insulin, from beta cells, lowers blood glucose by stimulating glucose uptake into muscle and adipose tissue (via GLUT4) and promoting glycogenesis. Glucagon, cortisol, and GH raise blood glucose. Insulin is the only hormone that significantly lowers blood glucose.
Explanation:
Petrified fossils (permineralization) form when dissolved minerals infiltrate the porous tissues of dead organisms and harden, turning the remains into stone while preserving internal structure. Mold and cast fossils are impressions, trace fossils are tracks or burrows. Petrified wood is a common example.
Explanation:
Fungi are eukaryotic, mostly multicellular (except yeast), and are heterotrophic by absorption (saprophytic or parasitic). Their cell walls contain chitin. Monera are prokaryotic, Protista are unicellular eukaryotes, Plantae are autotrophic multicellular organisms. Fungi play key roles as decomposers in ecosystems.
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