Question

Show with the help of a sketch that the plants are the ultimate source of food.

NCERT Class 7 Science Chapter 1 Nutrition in Plants

Answer 1

Plants are the basic source of food for all living organisms.
Plants prepare their food by the process of Photosynthesis.
Every organisms need food for getting energy to perform various tasks. 
Some of the plant sources of food are Vegetables, Cereals, Fruits, Pulses , oils etc.
Please refer to the attachment for diagram.

Answer 2

Answer:

Tree is producer

Grasshopper is a primary consumer

frog is a secondry consumer

snake is a tertiary consumer

Explanation:

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