Question

WO CI
characteristic
features
O
hormone.
1
2
3
3. The diagram given alongside
shows a type of tropism. Study
the same and
answer the
questions that follow :
(a) Name and define the type of
tropism shown in the diagram.
(b) Label the guidelines (1) to (4).
(c) Name two effective stimulants that
help in the growth of part (2).
(d) Name two groups of plants where part (2) grows
towards gametophyte with the help of the stimulants
mentioned in (c)
4. Study the diagrams given below and answer the
4​

Answer 1

Answer:

a) Chemotropism

b)pollen grain, pollen tube, embryo sac, ovary

c) Boron and sucrose

d) monocots and dicots( family angiosperms)

Answer 2

A. Chemotropism is the phenomena by which an object is compared to move towards other object due to chemical changes.

B. 1. Stigma 2 pollen tube 3. Embryo sac 4. Ovary

C. There is a release of chemical that stimulates the growth of the pollen tube. In addition to this the the attraction towards the embryo sac also helps in the growth of the pollen tube towards it.

D. In case of gymnosperms and angiosperms the growth of the pollen tube towards the gamut of height takes place with the help of the stimulus that is mentioned in the above line