Which one of the following is not observed in biodiversity hotspots?

From which plant were haploid plants first obtained through anther culture?

The least number among $\sqrt[3]{4}, \sqrt[4]{5}, \sqrt[4]{7}$ and $\sqrt[3]{8}$ is:

Seven white balls and three black balls are randomly arranged in a row. The probability that no two black balls are placed adjacently is

Two capillary tubes of same diameter are put vertically one each in two liquids whose relative densities are $0.8$ and $0.6$ and surface tensions are $60$ and $50 \, dyne/cm$ respectively. The ratio of the heights of the liquids in the two tubes $\frac{h_1}{h_2}$ is:

Which of the following statements is incorrect?