The correct option is Only two pairs.
Explanation
Economic activities are broadly classified into primary, secondary, and tertiary sectors based on the nature of work performed.
- Storage of agricultural produce – Secondary: Incorrect.
Storage of agricultural produce is a service related to distribution and logistics. Such activities fall under the tertiary (service) sector, not the secondary sector. - Dairy farm – Primary: Correct.
Dairy farming involves rearing animals and producing milk, which is a direct extraction of natural resources. Hence, it belongs to the primary sector. - Mineral exploration – Tertiary: Incorrect.
Mineral exploration is related to locating and extracting natural resources from the earth, which is part of the primary sector, not the tertiary sector. - Weaving cloth – Secondary: Correct.
Weaving cloth involves processing raw materials such as cotton or silk into finished products. Such manufacturing activities belong to the secondary sector.
Key Takeaway: Primary sector involves extraction of natural resources, secondary sector includes manufacturing activities, and tertiary sector provides services such as storage and transport.