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Praxis 2 (5435) Exam | Questions And Answers Latest {} A+ Graded | 100% Verified
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Praxis 2 (5435) Exam | Questions And Answers Latest {} A+ Graded | 100% Verified
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Praxis 2 (5435) Exam | Questions And Answers Latest {2024- 2025} A+ Graded | 100%Verified
Which of the following poses the greatest safety risk while being heated in a school laboratory?
(A) A mixture of iron and sulfur
(B) Mercury(II) oxide
(C) Sodium chloride
(D) Copper(II) sulfate hydrate - The best answer is (B). Mercury(II) oxide breaks down on heating to
metallic mercury and oxygen. Mercury vapor that is given off is highly toxic when inhaled or absorbed
through the skin, and exposure to mercury in a school should be greatly limited if not eliminated
altogether.
A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a
green filter. What color does the paper appear under this illumination?
(A) Blue (B) Green (C) Red (D) Black - The correct answer is (D). The green filter absorbs all colors except
green, which it passes. Therefore, the red light will be absorbed by the filter, which will pass no light.
The paper will not be illuminated, and so it will appear black, regardless of its initial color.
What quantity of oxygen, O2, contains very nearly the same number of molecules as 36.0 grams of
water, H2O?
(A) 64.0 grams
(B) 32.0 grams
(C) 16.0 grams
(D) 8.0 grams - The correct answer is (A). 36 grams of water is 2 moles (2 X 18 grams). A 2-mole sample
of O2 contains the same number of molecules as does 2 moles of any other substance. A 2-mole sample
of O2 would have a mass of
2 X 32.0 grams = 64.0 grams.
Which of the following is the most reasonable conclusion that can be drawn from the data?
Data - Tall Hybrid - treated - 50cm in 10 days
- water only - 35cm in 10 days
Dwarf Hybrid - treated - 35 cm in 10 days
- water only - 20cm in 10 days
(A) The new fertilizer influences the growth of both corn varieties tested
(B) The new fertilizer causes faster growth rate for both varieties than do other fertilizers
(C) The new fertilizer improves the root system of the tall hybrid to a greater extent than it does that of
, the dwarf hybrid
(D) The new fertilizer is effective in producing faster growth for both varieties for the first 10 days only -
The correct answer is (A). The graphs indicate more rapid growth for the treated samples than for the
untreated samples in both corn varieties. The other options describe results not tested in the
experiments and so not indicated by the data.
A person heterozygous for the recessive gene for cystic fibrosis marries a person who does not carry or
have the trait (homozygous dominant). What is the probability that the couple's first child will be a
carrier?
(A) 0.0 (B) 0.25 (C) 0.50 (D) 1.0 - The correct answer is (C). One parent will have the genotype CC and the
other parent will have the genotype Cc. The possible genotypes of the offspring are, therefore, CC, CC,
Cc, and Cc. Thus, 50 percent of the offspring will be homozygous dominant and 50 percent will be
heterozygous and carriers.
Which of the following is matched with its correct function?
(A) Ovule ..... production of pollen
(B) Vascular cambium ..... formation of apical meristem
(C) Xylem ..... transport of sugars
(D) Guard cell ..... regulation of transpiration rate - The correct answer is (D). Stomata open and close
due to the changing shape of the guard cells. Water exits freely through the stomata when they are
open.
Scientists believe that a worldwide catastrophic event occurred during the late Cretaceous period and
that this event likely caused which of the following?
(A) The movement of aquatic animals onto land
(B) The sudden demise of the dinosaurs
(C) The emergence of Homo sapiens on the grasslands of Africa
(D) The first appearance of mammals - The correct answer is (B). The sudden disappearance of 90
percent of the dinosaur species occurred about 60 million years ago. Recent chemical evidence points to
a catastrophic event, such as a large impact, occurring at that time.
Earth's seasons are caused by which of the following?
(A) The tilt of Earth's axis of rotation relative to the ecliptic as Earth revolves around the Sun
(B) The varying amount of sunspot activity
(C) Earth's orbit about the Sun as an ellipse rather than a circle
(D) The rotation of Earth during a 24-hour day - 8. The correct answer is (A). Seasons are best explained
as resulting from Earth's axial tilt and not from distance variations, sunspot activity, atmospheric
transparency, or rotation.
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