Which part of some plants store extra food?

The stem is the main part of the:

Which of the following are used to make medicines and in cooking?

Which of the following grows from the end of the stem?

Which of the following  takes food to all parts of a plant?

The green colouring substance in leaves is called:

Which of the following  has many tiny holes on its surface?

A plant breathes air in and out through:

Which of the following cannot stand straight because they have weak stems?

Which of the following  is a store house of food for the plant?