Food storing plant part in onion is:

Explanation:

• Different parts of plants like roots, shoots, leaves, flowers, fruits, etc perform the function of storage of food 
• The fleshy leaves of onion are its consumable part.
• As a whole, the onion is a bulb, which is a short modified form of a stem that is surrounded by these fleshy leaves that store food for the onion shoots.

Important Points

• The stored food in onion leaves is Sugar.

Mistake Points​Food is stored in the leaves. Onion as a whole is a modified stem

Additional Information  

• In plants like carrot, reddish, beetroot, sweet potato, turnip, etc. roots perform the function of food storage.
• Some plants store their food in the form of fruit. Ex- apple, guava, grapes mango, etc.
• Plants like potato, ginger, garlic, sugarcane, etc. store their food in stems.​