Question

During a science lesson, Anish learnt how to identify the cells.

$\begin{array}{cccc}Cellpart/cell& X& Y& Z\\ Nucleus& \surd & \surd & \surd \\ Cellwall& \surd & \surd & \surd \\ Cellmembrane& \surd & \surd & \surd \\ Chloroplast& & \surd & \surd \\ Guardcells& & & \surd \end{array}$

Which of the following correctly shows the parts of the plant from which X, Y and Z were obtained?

• A. Stem - X, Leaf - Y, Root - Z
• B. Stem - Y, Leaf - Z, Root - X
• C. Stem - Z, Leaf - X, Root - Y
• D. Stem - Z, Leaf - Y, Root - X

Answer 1

The correct option is B Stem - Y, Leaf - Z, Root - X

Roots are never green, which indicates that they do not contain chloroplasts. Stems of some plants (such as cactus) are green, so may contain chloroplasts. Guard cells are only present in leaves which regulate the rate of transpiration (by opening and closing the stomata).