Carbon, nitrogen, oxygen and hydrogen are considered because they are required in relatively large quantities, whereas manganese, zinc, and copper are considered because they are required in very small quantities.

macro-nutrients , micro-nutrients

Explanation:

For plant growth soil needs some basic elements which is basic need for plant growth and metabolic synthesis.

plant need approx 17 essential nutrients for growth and for completing its life cycle among which some are found in water and air. Nitrogen, carbon, hydrogen and oxygen needed the most and in large quantity as nitrogen helps in rapid growth and green color and is mobile and its deficiency lead to reduced growth and yellow foliage.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.