11. The phenomenon due to which animal sweat to reduce temperature and change electrolyte concentration is called:
[A] Homeorhesis
[B] Homeostasis
[C] Apoptosis
[D] Necrobiosis
Show Answer
Correct Answer: B [ Homeostasis]
Notes:
The phenomenon that causes animals to sweat to reduce temperature and change electrolyte concentration is homeostasis. When core body temperature increases, sweat glands respond by cooling the skin. Blood vessels also dilate, which allows the body to release more heat. Sweating is a rare ability in the animal kingdom. For example, rats don’t sweat when their core body temperature rises to 41°C. However, they do sweat in response to pilocarpine and other cholinergic agonists.
12. Which of the following glands is responsible for production of melatonin and to regulate reproductive hormones?
[A] Pineal gland
[B] Pituitary Gland
[C] Hypothalamus
[D] Adrenal Glands
Show Answer
Correct Answer: A [ Pineal gland]
Notes:
The primary function of the Pineal gland is production of melatonin, which helps maintain circadian rhythm and regulate reproductive hormones.
13. Kernel smut and Sheath blight are two common diseases which occur due to excessive use of nitrogen fertilizer. The diseases are most commonly found in which of the following crops?
[A] Rice
[B] Potato
[C] Cotton
[D] Sugarcane
Show Answer
Correct Answer: A [ Rice ]
Notes:
Kernel smut of rice normally is a minor disease. Damage is caused by the endosperm of the rice grain being replaced by masses of black fungal spores. Sheath blight disease caused by the fungus Rhizoctonia solani. This fungus is very widespread in agricultural crops.
14. Which among the following carries impure blood to human heart?
[A] Pulmonary vein
[B] Vena Cava
[C] Aorta
[D] Pulmonary arteries
Show Answer
Correct Answer: D [Pulmonary arteries]
Notes:
The pulmonary artery carries impure blood to the right and left lungs. The left half of the heart collects and pumps pure (oxygenated) blood from the lungs to all parts of the body.
15. Which among the following does not have a cell wall?
[A] Mycoplasma
[B] Paramecium
[C] Euglena
[D] Gonyaulax
Show Answer
Correct Answer: A [Mycoplasma]
Notes:
Mycoplasma are a mollicute genus of bacteria that lack a cell wall around their cell membranes. Mycoplasma species are the smallest bacterial cells yet discovered, can survive without oxygen, and come in various shapes.
16. Which of the following is the result of the decrease in white blood cells?
[A] Decrease in Antibodies
[B] Increase in Antigens
[C] Increase in Antibodies
[D] No change
Show Answer
Correct Answer: A [Decrease in Antibodies]
Notes:
A low white blood cell count usually is followed by decrease in number of antibodies. When your white blood cell count is low you may not have the usual signs and symptoms when developing an infection such as Redness, Swelling, Pus formation, Cough, Sputum, Nasal drainage and decrease in antibodies.
17. Which one of the following is useful for biological control of pests?
[A] Honey bees and locusts
[B] Scorpions and spiders
[C] Wasps and birds
[D] Parrots and kites
Show Answer
Correct Answer: B [Scorpions and spiders]
Notes:
Spiders, mites, scorpions, and several related groups are not insects, but belong to the arthropod class Arachnida. About 15 families of spiders are frequently encountered in crops, where they provide benefit as natural control agents.
18. In which of the following weeks the heart of human embryo starts beating?
[A] in the first week of its development
[B] in the third week of its development
[C] in the fourth week of its development
[D] in the sixth week of its development
Show Answer
Correct Answer: D [in the sixth week of its development]
Notes:
By 6 weeks, baby’s heart starts beating 110 times a minute. It has four hollow chambers, each with an entrance and an exit to allow blood to flow in and out of each chamber. In just two more weeks, that number will rise to 150-170 beats a minute.
19. Who is known as the ‘Father of Bacteriology’?
[A] Louis Pasteur
[B] Leeuwenhoek
[C] Robert Hooke
[D] Edward Jenner
Show Answer
Correct Answer: A [Louis Pasteur]
Notes:
Louis Pasteur is considered as father of Bacteriology. Louis Pasteur was a French chemist and microbiologist who was one of the most important founders of medical microbiology. He pioneered the study of molecular heterogeneity; discovered that microorganisms cause fermentation and disease; Initiated the process of pasteurization and developed vaccines against anthrax and rabies.
20. Why lysosomes are called suicidal bags?
[A] because it contains digestive enzymes
[B] because it contains endoplasmic reticulum
[C] because it contains Phospholipids
[D] None of these
Show Answer
Correct Answer: A [because it contains digestive enzymes]
Notes:
The lysosome is known as the suicide bag of the cell because it contains digestive enzymes.
