31. Which of the following are armored fish?
[A] Chondrichthyes
[B] Osteichtliyes
[C] Placoderms
[D] Acanthodians
Show Answer
Correct Answer: C [Placoderms]
Notes:
Placoderms are armored fish. The placoderms are a class of armored prehistoric fish, known from fossils, that lived from the Silurian to the end of the Devonian period.
32. Which of the following is rat-fish?
[A] Salmons
[B] Lamprey
[C] Sharks
[D] Chimeras
Show Answer
Correct Answer: D [Chimeras]
Notes:
Chimeras are cartilaginous fish in the order Chimaeriformes. They are known informally as ghost sharks, ratfish, spookfish, or rabbitfish.
33. The number of cervical vertebrae in reptiles is __
[A] 4
[B] 6
[C] 7
[D] 8
Show Answer
Correct Answer: C [7]
Notes:
Most reptiles have seven cervical vertebrae, including a three-part atlas and axis.
34. Which is a symptom of labyrinthitis?
[A] Pain in the ear
[B] Permanent deafness
[C] Chronic inflammation
[D] All of the above
Show Answer
Correct Answer: B [Permanent deafness]
Notes:
Permanent deafness is a symptom of labyrinthitis. Labyrinthitis is an infection of the inner ear. It affects your balance. It is also called vestibular neuritis.
35. Which is also known as the master gland of our body?
[A] Pineal gland
[B] Thyroid gland
[C] Adrenal gland
[D] Pituitary gland
Show Answer
Correct Answer: D [Pituitary gland]
Notes:
The pituitary gland is also known as the master gland of the human body. It is one of the smallest glands of the human body and it secretes the most number hormones in the body.
36. 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.
37. Mendel used which of the following one for his experiments.
[A] Pisum sativum
[B] Pisum album
[C] Oryza sativa
[D] Oryza Orientalis
Show Answer
Correct Answer: A [Pisum sativum]
Notes:
Mendel used Pisum sativum (peas)for his experiments because they saw many distinctive features in it and it could be easily grown and self-pollinated.
38. A cross between homozygous recessive and heterozygous plant is
____:
[A] Back cross
[B] Test cross
[C] Monohybrid cross
[D] Dihybrid cross
Show Answer
Correct Answer: B [Test cross]
Notes:
A cross between a homozygous plant with recessive traits and a heterozygous plant is known as a test cross. A test cross is a valuable tool in predicting the genotype of the organism in question. In its simplest form, a test cross is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype (and phenotype). Test cross is done to determine the genotype of an F2 generation plant, showing dominant characteristics. In the test cross, an F2 plant that shows the dominant trait is crossed with the homozygous recessive.
39. Which of the following increases the rate of heart beat?
[A] Peripheral nerves
[B] Parasympathetic nerves
[C] Sympathetic nerves
[D] Cranial nerves
Show Answer
Correct Answer: C [Sympathetic nerves]
Notes:
Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamine – epinephrine) to accelerate the heart rate. The parasympathetic nervous system (PNS) releases the hormone acetylcholine to slow the heart rate.
40. Which part of the brain is responsible for triggering actions like thinking, intelligence, memory and ability to learn?
[A] Control
[B] Cerebrum
[C] Hypothalamus
[D] Diencephalon
Show Answer
Correct Answer: B [Cerebrum]
Notes:
The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action. Functions of the cerebrum include: initiation of movement, coordination of movement, temperature, touch, vision, hearing, judgment, reasoning, problem solving, emotions, and learning.
