Question

shopkeepers selling ice blocks usually cover them with jute sacks explain why ​

Answer 1

warm air is not allowed by jute bags so....

Answer 2

the jute fibres present in the jute sacs do not allow warm air to enter the box as this warm air can make the ice melt. so basically these jute fibres act as insulators and prevent the ice from melting. thus the ice remains in the same state for a long duration of time.

HOPE THIS WAS OF SOME HELP