11. Which one of the following is secreted by Pancreas and regulates the amount of sugar in the body? (UPSC Prelims 1980).
[A] Renin
[B] Creatin
[C] Vitamin
[D] Insulin
Show Answer
Correct Answer: D [Insulin]
Notes:
Insulin and glucagon are hormones secreted by islet cells within the pancreas. They are both secreted in response to blood sugar levels, but in opposite fashion. Insulin is normally secreted by the beta cells of the pancreas. Glucagon raises blood glucose levels by stimulating the liver to metabolize glycogen into glucose molecules and to release glucose into the blood. Insulin is a hormone that regulates blood sugar levels.
12. A person walking barefooted in a field feels a sharp sting and on examination two puncture marks are found on his leg. He is most probably bitten by which of the following ages? (UPSC Prelims 1986)
[A] Poisonous snake
[B] Non-poisonous snake
[C] Scorpion
[D] Rat
Show Answer
Correct Answer: A [Poisonous snake]
Notes:
Snakebite is an injury caused by the bite of a snake, especially a venomous snake. A common sign of a bite from a venomous snake is the presence of two puncture wounds from the animal’s fangs. Those bitten may also describe a “sharp”, “rubbery”, “minty”, or “metallic” taste if bitten.
13. Most of the desert plants bloom during night time due to which of the following reasons? (UPSC Prelims 1995)
[A] their blooming is controlled by low temperature
[B] they are sensitive to the phases of the moon
[C] the desert insects eat away flowers during day time
[D] the desert insects are active during night time
Show Answer
Correct Answer: D [the desert insects are active during night time]
Notes:
In desert conditions, most of the activity of the plants and animals happens during the night because of very high temperature in the day time. The desert insects make themselves active and pollinate the flowers at night. To attract the insects, most of the desert plants bloom during the night.
14. Which one of the following genetic diseases is sex-linked? (UPSC Prelims 1999)
[A] Royal haemophilia
[B] Tay-Sachs disease
[C] Cystic fibrosis
[D] Hypertension
Show Answer
Correct Answer: A [Royal haemophilia]
Notes:
Royal haemophilia is sex- linked disease. Clotting of blood is abnormally delayed even small cut will result in non stop bleeding in the affected individual. Queen Victoria was a carrier of this disease and produce haemophilic descendents, so haemophilia is a royal disease.
15. Who was Louis Pasteur?
[A] A German Biologist
[B] A Polish Biologist
[C] A French Biologist
[D] A Russian Biologist
Show Answer
Correct Answer: C [A French Biologist]
Notes:
Louis Pasteur was a French biologist, microbiologist, and chemist renowned for his discoveries of the principles of vaccination, microbial fermentation and pasteurization. He is remembered for his remarkable breakthroughs in the causes and prevention of diseases, and his discoveries have saved many lives ever since. He reduced mortality from puerperal fever and created the first vaccines for rabies and anthrax. His medical discoveries provided direct support for the germ theory of disease and its application in clinical medicine. He is best known to the general public for his invention of the technique of treating milk and wine to stop bacterial contamination, a process now called pasteurization. He is regarded as one of the three main founders of bacteriology, together with Ferdinand Cohn and Robert Koch, and is popularly known as the “father of microbiology”.
16. Which of the following branch of biology deals with the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants?
[A] Agriforestry
[B] Horticulture
[C] Arboriculture
[D] Forestry
Show Answer
Correct Answer: C [Arboriculture]
Notes:
Arboriculture is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants.
17. What is a common feature of archaebacteria?
[A] Structure of cell membrane
[B] Structure of cell wall
[C] Has fatty acid synthetase
[D] Structure of flagellin protein
Show Answer
Correct Answer: C [Has fatty acid synthetase]
Notes:
Archaebacteria are primitive bacteria that have a cell wall consisting of branched lipids that help them to endure adverse conditions.
18. Which one of the following is the innermost part of a flower and the female reproductive organ?
[A] Stamen
[B] Pistil
[C] Stigma
[D] Sepals
Show Answer
Correct Answer: B [Pistil]
Notes:
The pistil is the innermost part of a flower and the female reproductive organ consists of three parts – the stigma, the style and the ovary collectively known as the pistil.
19. __ tissues upsurge the length of the plant.
[A] Lateral meristem
[B] Apical meristem
[C] Intercalary meristem
[D] All of the above
Show Answer
Correct Answer: B [Apical meristem]
Notes:
Apical meristem tissues upsurge the length of the plant. It is existent at the growing tips or apical of stems and roots.
20. What are the different stages of aerobic respiration?
[A] Glycolysis
[B] The Krebs cycle
[C] Oxidative phosphorylation
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
There are three phases of aerobic cellular respiration: glycolysis, the Krebs cycle, and oxidative phosphorylation.