31. Into how many subclasses are reptiles divided?
[A] 2
[B] 3
[C] 4
[D] 5
Show Answer
Correct Answer: B [3]
Notes:
The class Reptilia is divided into three major sub-classes: Anapsida, Parapsida, and Diapsida.
32. The mammals evolved from the reptile in the:
[A] Cretaceous
[B] Triassic
[C] Devonian
[D] Carboniferous
Show Answer
Correct Answer: B [Triassic]
Notes:
Mammals were derived in the Triassic Period from members of the reptilian order Therapsida. Triassic Period was about 252 million to 201 million years ago.
33. A microscopic gap between a pair of adjacent neurons over which nerve impulses pass when going from one neuron to the next is called __.
[A] Neurotransmitter
[B] Synapse
[C] Axon
[D] None of the above
Show Answer
Correct Answer: B [Synapse]
Notes:
A microscopic gap between a pair of adjacent neurons over which nerve impulses pass when going from one neuron to the next is called Synapse. Synapses connect neurons in the brain to the rest of the body and those neurons to muscles.
34. The muscular diaphragm that controls the size of the pupil is __
[A] cornea
[B] ciliary muscles
[C] iris
[D] retina
Show Answer
Correct Answer: C [iris]
Notes:
The muscular diaphragm that controls the size of the pupil is the iris. The iris helps control the amount of light entering the eye by opening and closing the pupil.
35. Our sense of smell also helps us to recognize which of the following?
[A] tastes
[B] temperature
[C] environment
[D] time
Show Answer
Correct Answer: A [tastes]
Notes:
Our sense of smell also helps us to recognize tastes.
36. What type of muscle is primarily found in your digestive tract?
[A] Rectus abdominus
[B] Cardiac Muscle
[C] Smooth Muscle
[D] Gastric Muscle
Show Answer
Correct Answer: C [Smooth Muscle]
Notes:
Smooth muscle, unlike skeletal muscle, is not under voluntary control and is found in walls of most organs and structures that contain muscle such as the esophagus, stomach, intestines, bronchi, uterus, urethra, and blood vessels. This muscle type’s responsibility is the contraction and relaxation necessary for the grinding and churning in the digestion process.
37. Beneath the Bowman’s capsule, the tubal coil forms the proximal tubule, and then it follows a hairpin turn called __
[A] loop of Henle
[B] nephron
[C] glomerulus
[D] Homeostasis
Show Answer
Correct Answer: A [loop of Henle]
Notes:
Beneath the Bowman’s capsule, the tubal coil forms the proximal tubule, and then it follows a hairpin turn called the loop of Henle.
38. Syphilis is a bacterial infection usually spread by __
[A] Sexual contact
[B] Wound infection
[C] Air-borne droplets
[D] None of these
Show Answer
Correct Answer: A [Sexual contact]
Notes:
Syphilis is a bacterial infection mostly spread by sexual contact. It is caused by Treponema pallidum bacteria.
39. 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.
40. Biofortification is a ____:
[A] Method of plant breeding for disease resistance
[B] Method of developing resistance to insect pests
[C] Method of breeding crops to increase their nutritional value
[D] Strategy to combat unwanted nutrients in plants
Show Answer
Correct Answer: C [Method of breeding crops to increase their nutritional value]
Notes:
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
