The branch of botany that deals with the study of plants providing food,fibers,and wood is known as:

The maximum value of $\frac{\log x}{x}, 0 < x < \infty$ is

Which of the following is basic in nature?

If $\overline{a}=\frac{1}{\sqrt{10}}(3 \hat{i}+\hat{k})$ and $\overline{b}=\frac{1}{7}(2 \hat{i}+3 \hat{j}-6 \hat{k})$,then the value of $(2 \overline{a}-\overline{b}) \cdot [(\overline{a} \times \overline{b}) \times (\overline{a}+2 \overline{b})]$ is

$A$ man pushes a wall and fails to displace it. He does:

Which one of the following is a matching set of phylum and its three examples?