31. What cannot sperm do in the absence of acrosome?
[A] Cannot penetrate the egg
[B] Cannot get energy
[C] Cannot get food
[D] Cannot swim
Show Answer
Correct Answer: A [Cannot penetrate the egg]
Notes:
The acrosome contains digestive enzymes. Digestive enzymes break down the outer membrane of the ovum. In the absence of acrosome, sperm cannot enter the egg.
32. Which of the following are not included in the male reproductive system?
[A] Testicles
[B] Oviducts
[C] Scrotum
[D] Vas deferens
Show Answer
Correct Answer: B [Oviducts]
Notes:
Oviducts are a part of the female reproductive system. It is also called the fallopian tube. It is the site of fertilization that connects the ovary to the uterus.
33. Seminiferous tubules develop central lumen after __
[A] Old age
[B] Prepuberal time
[C] Birth
[D] Puberty
Show Answer
Correct Answer: D [Puberty]
Notes:
Puberty is the time in life when a boy or a girl becomes sexually mature. The central lumen of the seminiferous tubule develops at puberty.
34. Which of the following virus causes Foot and Mouth disease?
[A] Coxsackievirus
[B] Retrovirus
[C] Cowpox virus
[D] Reovirus
Show Answer
Correct Answer: A [Coxsackievirus]
Notes:
Coxsackieviruses are part of the enterovirus family of viruses, which also include poliovirus and hepatitis A virus. They live in the human digestive system. It also causes Foot and Mouth disease.
35. Which of the following is an example of chromosomal disorders?
[A] Down’s syndrome
[B] Albinism
[C] Haemophilia
[D] Sickle cell anaemia
Show Answer
Correct Answer: A [Down’s syndrome]
Notes:
Down’s syndrome is an example of a chromosomal disorder. Whereas Albinism, Haemophilia, and Sickle cell anemia are examples of Mendelian Disorder.
36. Colour blindness is an __ linked recessive trait.
[A] Z chromosome
[B] Y chromosome
[C] X chromosome
[D] None of these
Show Answer
Correct Answer: C [X chromosome]
Notes:
Usually, color blindness is inherited as a recessive trait on the X chromosome. This is known in genetics as X-linked recessive inheritance.
37. The term biomass most often refers to which of the following?
[A] Inorganic matter
[B] Organic matter
[C] Chemicals
[D] Ammonium compounds
Show Answer
Correct Answer: B [Organic matter]
Notes:
The term biomass most often refers to Organic matter. Organic material is that was alive and is now in or on the soil.
38. A renewable, biodegradable fuel that is manufactured from vegetable oils and animal fats are called __
[A] Bioethanol
[B] Biomethane
[C] Biodiesel
[D] None of these
Show Answer
Correct Answer: C [Biodiesel ]
Notes:
A renewable, biodegradable fuel that is manufactured from vegetable oils and animal fats are called Biodiesel
39. Flowers emit fragrance to ____:
[A] Drive away flies
[B] Purify air
[C] Attract insects
[D] All of the above
Show Answer
Correct Answer: C [Attract insects]
Notes:
Flowers emit fragrance to attract pollinators which are mainly insects. The fragrance plays a prominent role in the localization and selection of flowers by insects, especially moth-pollinated flowers, which are detected and visited at night. If they have become infested with herbivores like caterpillars, they attract beneficial insects like parasitic wasps with the help of scent signals from their leaves.
40. The type of kidneys present in frog are ___:
[A] Metanephros
[B] Pronephros
[C] Archinephros
[D] Mesonephros
Show Answer
Correct Answer: D [Mesonephros]
Notes:
In the frog, Mesonephros is the functional kidney in embryonic as well as adult stage and mesonephric duct functions as both urinary and genital duct. Tubules of the anterior region of kidney get connected to testis to collect spermatozoa, while the posterior region remains as functional kidney and transports urinary wastes to the exterior.
