35. Which of the subatomic particles always have an equal number in a neutral atom? *
1 point
A. electron and proton
B. neutron and electron
C. proton and neutron
D. both A and B
36. Which is the correct number of electrons in a Na atom with a mass number of 23amu, and an atomic number of 11? *
1 point
A. 11
B. 12
C. 23
D. 34
37. Which is the correct number of neutrons in a Ti atom with a mass number of 48amu, and an atomic number of 22? *
1 point
A. 22
B. 24
C. 26
D. 70
38. Looking at the periodic table, in which part are most metals located? *
1 point
A. left side
B. middle
C. right side
D. scattered
39. Which of the following act as insulators at low temperatures, and become conductors at higher temperatures? *
1 point
A. metals
B. noble gasses
C. nonmetals
D. semiconductors
40. Looking at the periodic table, which arrangement of metals exhibits decreasing reactivity? *
1 point
A. all metals have equal reactivity
B. across groups from left to right
C. across groups from right to left
D. vertically from top to bottom
41. In which part of the digestive system does absorption of nutrients take place? *
1 point
A. large intestines
B. rectum
C. small intestines
D. stomach
42. Which type of cell division produces haploid cells? *
1 point
A. meiosis
B. mitosis
C. both A and B
D. neither A nor B
43. How many out of four offspring will have straight hair from a heterozygous dominant father and a homozygous recessive mother? *
1 point
A.1
B. 2
C. 3
D. 4
44. Which correctly describes the concept of species? *
1 point
A. It is a group consisting of several genera.
B. It is a group consisting of several classes.
C. It is the largest category in the taxonomic classification.
D. It is a group of similar organisms capable of reproduction of their own kind.
45. The scientific name of the dog is Canis familiaris. What two categories of classification comprise a scientific name? *
1 point
A. genus and species
B. family and genus
C. family and species
D. kingdom and phylum
46. Which of the following is NOT an advantage of high biodiversity in an ecosystem? *
1 point
A. high level of competition
B. plenty supply of resources
C. lesser rate of species loss
D. enough shelter for many species
47. Which correctly describes the flow of energy through trophic levels? *
1 point
A. increases
B. Stays the same
C. decreases
D. both A and B
48. Which organism gives off oxygen in the carbon dioxide-oxygen cycle? *
1 point
A. aerobic bacteria
B. animal
C. plant
D. both A and C
49. Which of the following recycles substances such as water, oxygen, carbon, and nitrogen in an ecosystem? *
1 point
A. consumer
B. decomposer
C. producer
D. saprotrophs
50. Which of the following does NOT help in minimizing the impact of humans on the environment? *
1 point
A. grow variety of crops
B. practice of monoculture
C. use of organic fertilizers
D. practice biological control of pests