LETRS UNITS
5 – 8 Post-Test
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1) Once students decode well, which statement describes the relationship between
vocabulary and reading comprehension?
A. Comprehension develops independently of vocabulary.
B. There is a weak relationship between vocabulary and comprehension, at best.
C. Vocabulary is the best single predictor of reading comprehension.
D. Vocabulary is too difficult to measure, so the relationship is unclear.
Answer: C. Vocabulary is the best single predictor of reading comprehension.
Rationale: (LETRS, 2025): Once students have a solid decoding foundation, vocabulary
1 /8
,knowledge plays the most significant role in comprehension. A robust vocabulary allows
readers to interpret text more accurately and fluently.
1 /8
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2) In teaching the word “invisible,” the teacher broke it into the parts in - vis - ible and
talked about the meanings of the parts. Which aspect of language was emphasized?
A. Morphology
B. Semantics
C. Phonology
D. Syllabification
Answer: A. Morphology
Rationale: (LETRS, 2025): Morphological awareness—understanding how prefixes, roots, and
suffixes function—helps students unlock meaning and expand their vocabulary.
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3) According to research on differences in word growth, which of the following is NOT
true?
A. A 4-year-old whose vocabulary is underdeveloped may learn about 1.6 root word
meanings per day.
B. A typical 4-year-old acquires 2.4 root word meanings per day.
C. It is important to provide experiences to stimulate language development growth for
children.
D. The gap in word knowledge automatically decreases by the end of grade 2.
Rationale: (LETRS, 2025): Without intentional and systematic vocabulary instruction,
2/8
5 – 8 Post-Test
────────────────────────────────────────────────────────
1) Once students decode well, which statement describes the relationship between
vocabulary and reading comprehension?
A. Comprehension develops independently of vocabulary.
B. There is a weak relationship between vocabulary and comprehension, at best.
C. Vocabulary is the best single predictor of reading comprehension.
D. Vocabulary is too difficult to measure, so the relationship is unclear.
Answer: C. Vocabulary is the best single predictor of reading comprehension.
Rationale: (LETRS, 2025): Once students have a solid decoding foundation, vocabulary
1 /8
,knowledge plays the most significant role in comprehension. A robust vocabulary allows
readers to interpret text more accurately and fluently.
1 /8
, ────────────────────────────────────────────────────────
2) In teaching the word “invisible,” the teacher broke it into the parts in - vis - ible and
talked about the meanings of the parts. Which aspect of language was emphasized?
A. Morphology
B. Semantics
C. Phonology
D. Syllabification
Answer: A. Morphology
Rationale: (LETRS, 2025): Morphological awareness—understanding how prefixes, roots, and
suffixes function—helps students unlock meaning and expand their vocabulary.
────────────────────────────────────────────────────────
3) According to research on differences in word growth, which of the following is NOT
true?
A. A 4-year-old whose vocabulary is underdeveloped may learn about 1.6 root word
meanings per day.
B. A typical 4-year-old acquires 2.4 root word meanings per day.
C. It is important to provide experiences to stimulate language development growth for
children.
D. The gap in word knowledge automatically decreases by the end of grade 2.
Rationale: (LETRS, 2025): Without intentional and systematic vocabulary instruction,
2/8
