Which of the following is an example of rhizome?

Which of the following fruits cannot be ripened artificially by ethylene?

Which of the following is an aggregate fruit?

Xylem helps in the transportation of which of the following in a plant?

Which of the following is obtained from the plant Camellia sinensis?

What are trees called that keep their green leaves all year round? 

Which of the following trees produce Conkers?

Which is the national tree of India?

Which is the National Fruit of India?

Roughly how many trees are there on Earth?