Fig. 9.1 shows how the mean global atmospheric carbon dioxide concentration has changed over the $$$800000\left(800 \times 10^{3}\right)$$$ years leading up to the year 2020. (i) Calculate the percentage increase in carbon dioxide concentration between point $$$\mathbf{A}$$$ and the year 2020. Show your working. Write your answer to one decimal place. percentage increase $$$=$$$ .................................................. $$$\%$$$ (ii) Suggest how the changes in carbon dioxide concentration between A and the year 2020 may have affected the environment and biodiversity. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . .................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s24_qp_43 Year：2024 Question No：9(a)

Answer:

Knowledge points:

18.2.1 define the terms ecosystem and niche

18.2.2.1 the number and range of different ecosystems and habitats

18.2.2.2 the number of species and their relative abundance

18.2.2.3 the genetic variation within each species

18.2.3 explain the importance of random sampling in determining the biodiversity of an area

18.2.4 describe and use suitable methods to assess the distribution and abundance of organisms in an area, limited to frame quadrats, line transects, belt transects and mark-release-recapture using the Lincoln index (the formula for the Lincoln index will be provided, as shown in the Mathematical requirements)

18.2.5 use Spearman’s rank correlation and Pearson’s linear correlation to analyse the relationships between two variables, including how biotic and abiotic factors affect the distribution and abundance of species (the formulae for these correlations will be provided, as shown in the Mathematical requirements)

18.2.6 use Simpson’s index of diversity (D) to calculate the biodiversity of an area, and state the significance of different values of D (the formula for Simpson’s index of diversity will be provided, as shown in the Mathematical requirements)

Answer:

Knowledge points:

Solution:

Related Question