Worked example
A plant was 4 cm tall on Monday and 7 cm on Friday. What does this show?
Answer & why
Answer: It grew 3 cm taller.
7 − 4 = 3 cm of height increase.
Grade 1 · Science
Read evidence about plant growth
Use a plant observation log to identify a measured change.
8 authored questions + worked example
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All questions
All 8 authored questions for this skill.
Question 1
The same pot's mass was 200 g before watering and 230 g just after. What was measured?
- Two seedlings were observed.
- It gained 3 leaves.
- It grew 3 cm taller.
- The pot's mass increased by 30 g.
A hint
Separate what a log records from explanations that still need testing.
Answer & why
Answer: The pot's mass increased by 30 g.
230 − 200 = 30 grams.
Question 2
Three seeds were planted and two seedlings appeared. What can be concluded from this count?
- It grew 3 cm taller.
- Two seedlings were observed.
- The soil became damp.
- It gained 3 leaves.
A hint
Separate what a log records from explanations that still need testing.
Answer & why
Answer: Two seedlings were observed.
The count establishes two observed seedlings, not why another was absent.
Question 3
A plant was 4 cm tall on Monday and 7 cm on Friday. What does this show?
- A root was visible on day 3.
- It grew 3 cm taller.
- It gained 3 leaves.
- The soil became damp.
A hint
Separate what a log records from explanations that still need testing.
Answer & why
Answer: It grew 3 cm taller.
7 − 4 = 3 cm of height increase.
Question 4
A seedling had 2 leaves, then 5 leaves. What changed?
- The flower opened.
- A root was visible on day 3.
- The soil became damp.
- It gained 3 leaves.
A hint
Separate what a log records from explanations that still need testing.
Answer & why
Answer: It gained 3 leaves.
5 − 2 = 3 more leaves were recorded.
Question 5
A log says the soil was dry before watering and damp afterward. What was observed?
- No height change was measured.
- The soil became damp.
- A root was visible on day 3.
- The flower opened.
A hint
Separate what a log records from explanations that still need testing.
Answer & why
Answer: The soil became damp.
Dampness after watering is the stated observation.
Question 6
A seed's first root appeared on day 3. Which statement matches the log?
- No height change was measured.
- The pot's mass increased by 30 g.
- The flower opened.
- A root was visible on day 3.
A hint
Separate what a log records from explanations that still need testing.
Answer & why
Answer: A root was visible on day 3.
This restates the recorded observation without adding a cause.
Question 7
A flower bud was closed yesterday and open today. What changed?
- The pot's mass increased by 30 g.
- No height change was measured.
- The flower opened.
- Two seedlings were observed.
A hint
Separate what a log records from explanations that still need testing.
Answer & why
Answer: The flower opened.
The two observations describe a bud opening.
Question 8
A stem measured 8 cm both morning and afternoon. What does the log show?
- No height change was measured.
- The pot's mass increased by 30 g.
- Two seedlings were observed.
- It grew 3 cm taller.
A hint
Separate what a log records from explanations that still need testing.
Answer & why
Answer: No height change was measured.
Both measurements are 8 cm, so the measured change is zero.