Which of the following best describes a frequency polygon?

JAMB Mathematics 2024 83 views

Which of the following best describes a frequency polygon?

  1. A bar graph used to compare different categories.
  2. A pie chart that shows the proportion of different segments.
  3. A line graph that connects the midpoints of the tops of bars in a histogram to display the distribution of a dataset. ✓
  4. A scatter plot used to show the relationship between two variables.

Explanation

Plants have two transport systems. Xylem: transports water and minerals from roots upward. Dead cells form continuous tubes. Movement driven by transpiration pull (evaporation from leaves creates suction) and root pressure.

Phloem: transports sugars (from photosynthesis) to where needed. Living cells. Movement is bidirectional – can go up or down depending on where sugars are produced and needed. Called translocation.

Transpiration: water loss through stomata. Benefits: drives water uptake, cools plant. Factors: temperature, humidity, wind, light. Guard cells control stomata opening to balance water loss and CO₂ uptake.

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