31. Human sperm moves with the help of which of the following?
[A] Cilia
[B] Flagellum
[C] Basal body
[D] Nucleosome
Show Answer
Correct Answer: B [Flagellum]
Notes:
Human sperm moves with the help of the Flagellum. The flagellum is primarily a motility organ that enables movement and chemotaxis.
32. A tube that allows urine to pass out of the body __
[A] penis
[B] urethra
[C] scrotum
[D] All of the above
Show Answer
Correct Answer: B [urethra]
Notes:
A tube that allows urine to pass out of the body’s urethra. It is a long tube that runs through the penis.
33. Which of the following is an example of Phenotype?
[A] Eye color
[B] Sound of your voice
[C] Hair color
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Eye color, Sound of your voice, and Hair color are examples of Phenotype. The observable physical properties of an organism are called Phenotypes.
34. Which of the following is an important objective of biotechnology in the field of agriculture?
[A] to decrease seed number
[B] to produce pest-resistant varieties of plants
[C] to increase phosphorous, nitrogen production
[D] to reduce the number of plants
Show Answer
Correct Answer: B [to produce pest-resistant varieties of plants]
Notes:
An important objective of biotechnology in the field of agriculture is to produce pest-resistant varieties of plants.
35. Who among the following did the mapping of the human genome?
[A] Oswald Avery
[B] James Watson
[C] Linda Buck Born
[D] Rachel Carson
Show Answer
Correct Answer: B [James Watson]
Notes:
James Watson did the mapping of the human genome. The complete set of nucleic acid sequences for humans encoded as DNA within 23 chromosome pairs in the cell nucleus and a small DNA molecule found within individual mitochondria is called the human genome.
36. Membrane lipids of chillsensitive plants contain ____:
[A] Low proportion of saturated fatty acids
[B] Equal proportion of saturated and unsaturated fatty acids
[C] Low proportion of unsaturated fatty acids
[D] High proportion of unsaturated fatty acids
Show Answer
Correct Answer: D [High proportion of unsaturated fatty acids]
Notes:
The membranes of chill sensitive plants have about a 2 :1 ratio of unsaturated to saturated fatty acids. It has been seen that the proportion of unsaturated membrane fatty acids increases and the critical temperature decreases so that chill-sensitive plants are more acclimitized to low temperatures.
37. The pouch connected to the junction of the small intestine and the large intestine is called ___:
[A] Condyle
[B] Coccyx
[C] Caecum
[D] Axilla
Show Answer
Correct Answer: C [Caecum]
Notes:
Cecum is a pouch connected to the junction of the small and large intestines. It is a large tube-like structure in the lower abdominal cavity that receives undigested food material from the small intestine and is considered the first region of the large intestine. It is separated from the ileum (the final portion of the small intestine) by the ileocecal valve (also called Bauhin valve). The main functions of the cecum are to absorb fluids and salts that remain after completion of intestinal digestion and absorption and to mix its contents with a lubricating substance, mucus.
38. The cells which are colsely associated and interacting with guard cells are ____:
[A] Transfusion tissue
[B] Complementary cells
[C] Subsidiary cells
[D] Hypodermal cells
Show Answer
Correct Answer: C [Subsidiary cells]
Notes:
Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.
39. What are Lipids?
[A] Lipids are monosaccharides
[B] Lipids do not provide energy to cells
[C] Fruits are a good source of lipids
[D] Cholesterol and trans fatty acids are types of Lipids
Show Answer
Correct Answer: D [Cholesterol and trans fatty acids are types of Lipids]
Notes:
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterolcontaining metabolites such as cholesterol.
40. The presence of air bubble in blood stream is dangerous to life because _____:
[A] The flow of blood is obstructed
[B] The flow of blood increases manifold
[C] Air combines with blood forming a complex
[D] The pressure of blood increases manifold
Show Answer
Correct Answer: A [The flow of blood is obstructed]
Notes:
The presence of air bubble in blood, known as air embolism, occludes blood vessels. The flow of blood is obstructed causing strokes, heart attacks, pulmonary complications. An arterial air embolism is far more dangerous than a venous embolism since it prevents oxygenated blood from reaching the target organ and cause ischemia. It can even lead to heart attack or stroke leading to death.
