Biology
Answer
The function of the pollen tube is to carry the male gametes/sperm nuclei from the pollen grain to the embryo sac inside the ovule for fertilization.
The pollen tube grows out of the pollen grain by breaking through its exine. It grows through the stigma and style by dissolving these tissues with the help of enzymes and reaches the ovary, where it enters the ovule through a minute pore called the micropyle.
Related Questions
What are the advantages of fragrant nectar in the flower to the plant concerned?
Describe the advantages and disadvantages of cross-pollination to the plant.
The figure shown below represents a process in flowers. Study the same and answer the following questions.
(a) Name and define the process.
(b) Write the technical term of the above mentioned process.
(c) Give two examples of plants in which this process occurs.
(d) Write one advantage and one disadvantage of the process shown.
(e) Name two agents that participate in this process.
Given alongside is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the questions that follow:
(a) Name the parts labelled 1, 2, 3, 4 and 5.
(b) Where does the germination of the pollen grain take place and how?
(c) What is the function of the part labelled '4'?
(d) What happens to the part labelled '5' during the process?
