Which tree trunk is used as railway sleepers

Herbal plants are

The reproductive structure found in flowering plants:

Of the following, which is the seed part of the plant?

Which is the tallest tree in the world?

Which plant produces the smallest flower?

Which plant is used to cure abdominal disease?

The branch of science which deals with plant biology is

Agriculture is a branch of

The study of metals, non-metal melting substances, odour, taste of materials used in our day to day life is known as