Biology MCQs

Notes:
Golgi apparatus  acts as a dispatch station of protein products received from the endoplasmic reticulum (ER). Lysosomes are membrane-bound organelles. They are also called suicide bags because in case of disturbance of their cellular metabolism they digest their own cell by releasing own enzymes. Though lysosomes are not commonly-found in plant cells, but some plant cells do contain lysosomes. 

Notes:
The chorion, being the outermost membrane surrounding a developing embryo, plays a pivotal role in facilitating exchange between the embryo and its environment. It forms part of the fetal membranes that include the amnion, yolk sac, and allantois, nestled below the amniotic sac and in connection with the maternal tissue. The placenta, though not an option here, would still be a correct answer as it is a temporary organ developed during gestation to nourish and oxygenize the developing fetus while eliminating waste products. Both the chorion and the placenta are indispensable for substance exchange between the fetus and mother during gestation.

Notes:
Flowering in long day plants is related to Gibberlin. Long-day plants usually flower when the night length falls below their critical photoperiod. Many of our summer blooming flowers and garden vegetables are long day plants.

Notes:
Ikki disease is found in ground nut. Groundnut is taxonomically classified as Arachis hypogaea, is a legume crop grown mainly for its edible seeds. It is widely grown in the tropics and subtropics.

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Withania somnifera or commonly called as Ashwagandha is known as Indian ginseng.

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Infants who drink water contaminated with high levels of nitrate or take foods made with water which is contaminated with nitrate may develop serious health condition due to which infant’s blood is unable to carry enough oxygen to body cells and tissue. This condition is known as methemoglobinemia or “blue baby syndrome.”

Notes:
Hodophobia is the fear of travel. It is also referred to as travel phobia or fear of travel. Acute anxiety which is provoked by travel can be treated with anti-anxiety medication.

Notes:
Dr. Robert Koch was a German (Prussian) physician. In 1877 he isolated Bacillus anthracis (causative agent of Anthrax) . He also isolated Tuberculosis bacillus (Causative agent of TB) and Vibrio cholera (causative agent of Cholera). He is also known to develop Koch’s postulates, the four criteria designed to establish a causal relationship between a causative microbe and a disease. He was awarded the Nobel Prize in Physiology or Medicine for his tuberculosis findings in 1905.

Notes:
The movement of water through semipermeable membrane from region of higher concentration to region of lower concentration is called Osmosis. The uptake or absorbtion of water by solid substance without forming solution is called Imbibition.

Notes:
Wilhelm Johannsen was a Danish botanist, plant physiologist, and geneticist. He is best known for coining the terms gene, phenotype and genotype, and for his 1903 “pure line” experiments in genetics.