Question

The diagram given alongside shows a type of tropism. Study the same and answer the questions that follow:

1. Name and define the type of tropism shown in the diagram.
2. Label the guidelines (1) to (4).
3. Name two effective stimulants that help in the growth of part (2). 
4. Name two groups of plants where part (2) grows towards gametophyte with the help of the stimulants mentioned in (c).

Answer 1

1. Chemotropism: Chemotropism is the phenomenon of the growth of plant organs in response to chemicals.
2. 1. Pollen grain
   2. Pollen tube
   3. Ovule
   4. Ovary
3. Sugars and peptones.
4. Gymnosperms and angiosperms.