Answer the following questions : 1. Define (i) Leaf (ii) Venation (iii) Phyllotaxy 2. What imparts green colour to a leaf?
Answers
Answer:
1. Leaf :
A leaf is an above-ground plant organ and it is green. Its main functions are photosynthesis and gas exchange. A leaf is often flat, so it absorbs the most light, and thin, so that the sunlight can get to the chloroplasts in the cells. Most leaves have stomata, which open and close.
Venation :
the arrangement of veins in a leaf or in an insect's wing.
Phyllotaxy:
In botany, phyllotaxis or phyllotaxy is the arrangement of leaves on a plant stem (from Ancient Greek phýllon "leaf" and táxis "arrangement"). Phyllotactic spirals form a distinctive class of patterns in nature.
2. So, plants and their leaves look green because the “special pair” of chlorophyll molecules uses the red end of the visible light spectrum to power reactions inside each cell. The unused green light is reflected from the leaf and we see that light.
Answer:
leaf
an above ground organ in a plant that may or may not contain chlorophyll is called leaf
venation
this is a vain formation process on the leaf
phyllotaxy
the arrangement of leaf inca plant system
what impacts the green colour of a leaf
chlorophyll