Which process prevents multiple pollen tubes from fertilizing the same ovule?

• Polytubey block
• Apomixis
• Self-pollination
• Dormancy

What triggers the termination of pollen tube attraction after successful fertilization in angiosperms?

• Ethylene signaling

True or False: The synergid cells in the ovule send long-distance signals to guide the pollen tube.

Which substance is primarily responsible for patching leaks in the growing pollen tube?

• Cellulose
• Callose
• Lignin
• Chitin

In the process of pollination, what structure forms to guide sperm cells to the ovule?

• Pollen tube

True or False: In gametophytic self-incompatibility, the genotype of the stigma (mother plant) determines whether fertilization is successful, not the pollen's genotype.

Which of the following describes sporophytic self-incompatibility?

• Based on the haploid genotype of the pollen
• Based on the diploid genotype of the pollen
• Enzyme recognition by the ovule
• No mechanism for incompatibility

What is the main function of self-incompatibility in angiosperms?

• To promote self-fertilization
• To prevent gene diversity
• To promote gene diversity and block inbreeding
• To enhance pollen tube growth

True or False: The formation of the pollen tube during pollination is regulated by calcium ions (Ca2+).

Name the gene responsible for controlling self-incompatibility in angiosperms. (Hint: It is a multiallelic gene that starts with 'S'.)

• S gene