Question

How do the reactant molecules of photosynthesis reach the chloroplasts in leaves?

Answer 1

Hint: Similar to humans having veins, plants also have thin microscopic vein-like structures present from the tip to the end of the root system called xylem and phloem; they also pose small openings on their leaves for respiration called stomata.
Remember that the Xylem, phloem and stomata play an important role while the reactant molecules reach the chloroplast in leaves.

Complete answer:
Photosynthesis: Photo meaning light and Synthesis meaning breakdown
The process of conversion of light energy captured from the sun into chemical energy by plants and other microorganisms like algae and bacteria is termed as photosynthesis. In the whole process the carbon dioxide and water undergo series of different chemical reactions to finally produce Glucose $\left(C_6{H}_{12}{O}_6\right)$ and oxygen $\left(O_2\right)$ (which is released out).

Reactant molecules of photosynthesis: Water $\left(H_{2}O\right)$, Carbon dioxide $\left(C{O}_2\right)$, Light energy.

The reactant molecules which are water, $C{O}_2$ and light reach the chloroplast in different ways: the water reaches the leaves by the help of Xylem, the xylem in found vascular bundles which consist of Xylem and phloem; the carbon dioxide reaches the chloroplast through tiny openings present on the epidermis of leaves called stomata which normally forms dew after releasing water; the light energy is directly absorbed by the leaves here the sun acts as the source of light energy which is being captured.

Note: Xylem and Phloem help in the transport of essential materials among the different plant parts (roots to leaves and leaves to other parts like stem and roots).
As we know that the Xylem carries water away from roots to other parts of the plant where the Phloem carries sugar from leaves to other parts of the plant.
The Stomata is responsible for transpiration(exhalation of water) and gas exchange where in it takes in the carbon dioxide $\left(C{O}_2\right)$ and releases oxygen $\left(O_2\right)$ once the Photosynthesis reaction comes to end.