The pigment that gives the brown color to algae such as kelp is:
A. Phycocyanin
B. Phycoerythrin
C. Fucoxanthin
D. Chlorophyll
Answer: Option C
Solution (By JKExamLibrary)
Fucoxanthin is a carotenoid pigment found in brown algae (Phaeophyceae) that gives them their characteristic brown or olive-green color, masking the green chlorophyll. Phycoerythrin is red (red algae), phycocyanin blue (cyanobacteria, some red algae). Brown algae include kelps and Fucus.
Explanation:
Color blindness (specifically red-green color blindness) is an X-linked recessive disorder. The gene responsible is located on the X chromosome. Males (XY) are more frequently affected because they only have one X chromosome; a single recessive allele will cause the disorder. Females (XX) need two recessive alleles to be affected, making them more likely to be carriers.
Explanation:
Accommodation involves lens shape change via ciliary muscles. The blind spot lacks photoreceptors; fovea has high cone density; pupil adjusts via iris.
Explanation:
Methane (CH₄) is produced by methanogenic bacteria in anaerobic conditions of flooded rice paddies. It is a potent greenhouse gas, with a global warming potential many times that of CO₂. Nitrous oxide comes from fertilizers, CO₂ from fossil fuels, CFCs from refrigerants. Methane also comes from livestock.
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