The part of the seed that contains stored food for the embryo is the:
A. Seed coat
B. Radicle
C. Plumule
D. Cotyledon
Answer: Option D
Solution (By JKSSB Mock Tests)
Cotyledons are seed leaves that store food (starch, proteins, lipids) for the developing embryo and may become photosynthetic after germination. Monocots have one, dicots two. Radicle is root, plumule shoot, seed coat protects.
Explanation:
Selman Waksman and his team isolated streptomycin from the soil bacterium Streptomyces griseus in 1943. It was the first effective antibiotic against tuberculosis. Fleming discovered penicillin, Pasteur developed rabies vaccine, Koch identified tuberculosis bacillus. Waksman coined the term 'antibiotic'.
Explanation:
Hinge joints (ginglymus) permit flexion and extension only, like a door hinge. The elbow, knee, and interphalangeal joints are examples. Ball-and-socket (hip) multiaxial, pivot (neck) rotation, saddle (thumb) biaxial.
Explanation:
Peter Mitchell proposed the chemiosmotic theory (1961), explaining that a proton gradient across a membrane drives ATP synthesis. Krebs discovered the citric acid cycle, Calvin the Calvin cycle, Lipmann discovered coenzyme A.
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