The Organism in the Environment
1. This question has 4 part(s).
1.1. Separate: Biology Only
A group of students compares the distribution of plant species in two fields using this method.
Use random sampling
Use a 0.5m × 0.5m quadrat
Count the number of each species in a quadrat
Repeat this method for five quadrats in each field.
The tables show the students’ results
Species | Field A | ||||||
|---|---|---|---|---|---|---|---|
Number of plants in each quadrat | Number of plants per m2 | ||||||
First | Second | Third | Forth | Fifth | Mean | ||
Dandelion | 7 | 0 | 6 | 3 | 4 | 4 | 16 |
Buttercup | 2 | 1 | 0 | 3 | 2 | 2 | 6 |
Violet | 1 | 0 | 2 | 1 | 2 | 1 | 5 |
Heather | 2 | 3 | 1 | 2 | 1 | 2 | 7 |
Species | Field B | ||||||
|---|---|---|---|---|---|---|---|
Number of plants in each quadrat | Number of plants per m2 | ||||||
First | Second | Third | Forth | Fifth | Mean | ||
Dandelion | 7 | 3 | 2 | 1 | 2 | ||
Buttercup | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Violet | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
Heather | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Describe how the students would obtain random samples from each field.
1.2. Separate: Biology Only
(i) Calculate the mean number of dandelions per quadrat in field B.
(1)
(ii) Calculate the number of dandelions per m2 in field B
(1)
1.3. Separate: Biology Only
Describe the differences in species distribution in field A and field B.
1.4. Separate: Biology Only
A teacher suggests that there are no buttercups in field B because of poor water drainage from the field.
Describe what further experiment the students could do to investigate this suggestion.
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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