Biology MCQs

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Connects the lower pole of the gonad and epididymis to the future inguinal canal is called the Gubernaculum.

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Phosphorus is the essential chemical fertilizer for better rhizobial nitrogen fixation.

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Ethanol is used to obtain a precipitate of pure DNA. Renewable fuel made from corn and other plant materials is called ethanol.

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Jaundice is a yellowish pigmentation of the skin, the conjunctival membranes over the sclerae (whites of the eyes), and other mucous membranes caused by hyperbilirubinemia. Concentration of bilirubin in blood plasma does not normally exceed 1 mg/dL (>17?mol/L). A concentration higher than 1.8 mg/ dL (>30?mol/L) leads to jaundice. Jaundice is often seen in liver disease such as hepatitis or liver cancer.

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Female gametes are also called eggs or ova. They are created during the cellular reproduction process known as meiosis. The resulting gamete cell is a haploid cell. When the two haploid cells, the egg and sperm, fuse together during fertilization, the result is a diploid cell called a zygote.

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Sharks possess a heterocercal caudal fin in which the dorsal portion is usually noticeably larger than the ventral portion. This is because the shark’s vertebral column extends into the dorsal portion, providing a greater surface area for muscle attachment.

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Typhoid fever, also known simply as typhoid, is a bacterial infection due to Salmonella typhi, also known as Salmonella enterica serotype typhi, that grows in the intestines and blood. Typhoid is spread by eating or drinking food or water contaminated with the feces of an infected person.

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New born babies and children normally breathe faster than older children and adults. Their respiratory rate is about 30-60 breaths per minute. The respiratory rate for the different age-categories of children is:-6-12 months: 24-30; 1-5 years: 20-30; 6-12 years: 12-20.

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The thin layer of living cells just inside the bark is called the cambium. It is found in the area between xylem and phloem. It forms parallel rows of cells, which result in secondary tissues. It is the part of the tree that makes new cells, allowing the trees to grow wider each year.

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Red rot is one of the oldest known diseases of sugarcane that is caused by the fungus Colletotrichum falcatum (Glomerella tucumanensis). It is characterized by interrupted red and white patches within the cane along with a sour alcoholic odour when the cane is split open.