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**In a 15m2 habitat, the total number of Tridax counted using a 1.6m2 quadrant thrown randomly 50 times was 400. What is the Tridax?**

**A. 12**

**B. 16**

**C. 8**

**D. 5**

**QUICK ANSWER…**

**D**

**DETAILS…**** **** **

**Tridax is a plant whose population is to be determined in the context of this question. The use of quadrant is often employed in estimating the population of an organism in a habitat.**

**The question “what is the tridax?” is actually asking for the population of tridax per square meter of the habitat.**

**Mathematically;**

**Hence tridax population per square meter = 75/15 = 5**

**Now for the right answer to the above question:**

**12 is quite incorrect.****16 is also incorrect.****8 is incorrect.****D is correct, the population of tridax per square meter is 5**

**QUICK ADVICE…**

**You may please note that:**

**The unit is not included in the options, this may be a typo error…****Absence of unit suggests the answer should be just 75, which is the estimated population of tridax in the whole habitat.**

**Use the questions and answers session to raise further questions and deal more on this topic…**

**/ culled from 2017 JAMB-UTME biology question 23 /**