Link a vegetation feature to climate in three parts: the claim, the figures from the table, and the reason the climate produces that feature. Naming the feature alone scores little.
This lesson opens vegetation, climate and wildlife relationships.
What is the claim, evidence, reason pattern?
The claim says what the vegetation is like. The evidence quotes the climate figures. The reason explains how those figures lead to the feature.
Keep each part to one sentence. Three sentences make a full point.
Worked example: a dry-season plant cover
This is an original table for Zone D. Average temperature is 30°C all year. Rainfall is 200 mm in each of 4 months and 10 mm in each of the other 8 months.
First, total rainfall: (4 × 200) + (8 × 10) = 800 + 80 = 880 mm a year. Most of it, 800 of 880, falls in 4 months. That is 800 ÷ 880 = 91%.
Suppose the vegetation is grass with scattered trees that drop leaves in the dry months.
Claim: the trees lose their leaves for part of the year. Evidence: 8 months have only 10 mm of rain, although it is 30°C throughout. Reason: dropping leaves reduces water loss when water is short and evaporation is high.
Joined together: “Trees here lose their leaves because 8 months receive only 10 mm of rain at 30°C, so shedding leaves reduces water loss in the dry season.”
The mistake that loses marks
A weak answer is “It is a savanna, so the trees drop leaves”. This uses the vegetation name as the reason.
| Weak | Strong |
|---|---|
| It is a savanna. | 91% of the 880 mm falls in 4 months. |
| Trees drop leaves because it is dry. | Eight months get 10 mm, so leaf loss cuts water loss. |
The strong answer would still work if the place had a different name. The weak one would not.
What if the data is thin?
Suppose the table gives only annual rainfall, 880 mm, with no monthly figures. You cannot claim the rain is seasonal.
What can you say? “The total is moderate, but without monthly figures the table cannot show a dry season.” This is a correct use of evidence, and the claim and evidence revision desk gives you practice with it.
Check yourself
Zone E has 26°C all year and 300 mm of rain in every month. The vegetation has tall trees in distinct layers. Write a claim, evidence and reason.
Answer
Claim: the vegetation has tall trees in distinct layers. Evidence: rainfall is 300 mm in each of 12 months, which is 3 600 mm a year, and the temperature stays at 26°C. Reason: constant warmth and water let plants grow all year and compete for light, so they grow tall and form layers.
The table does not include soil, so soil richness cannot be claimed.
What to study next
Next, read comparing vegetation types without a climate determinist claim. For a teacher to check your evidence and reasons, see online one-to-one Geography tuition.