The structure that regulates the entry of light into the eye is the:
A. Cornea
B. Pupil
C. Retina
D. Lens
Answer: Option B
Solution (By JKSSB Mock Tests)
The pupil is the opening in the center of the iris whose size is adjusted by the iris muscles to control the amount of light entering the eye. The cornea and lens focus light, the retina senses it. In bright light, the pupil constricts; in dim light, it dilates.
Explanation:
Mendel’s first law (segregation) states that the two alleles for a trait separate during gamete formation. Homozygous individuals have identical alleles; phenotype is observable trait; a monohybrid ratio is 3:1.
Explanation:
Agarose gel electrophoresis separates DNA fragments by size as they move through the gel under an electric field; smaller fragments migrate faster. DNA is stained with ethidium bromide and visualized under UV light. PCR amplifies DNA, centrifugation separates by density, microscopy provides magnified images. Gel electrophoresis is essential in molecular biology and forensics.
Explanation:
Chlorella and Spirulina (a cyanobacterium) are used as single-cell proteins and health supplements due to their high protein content (up to 60%) and essential nutrients. Gelidium is used for agar, Sargassum is a brown alga, Polysiphonia a red alga. Chlorella is a unicellular green alga.
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