Plant reproduction Knowledge-Based Practice

Questions

1. 1.

   Which evolutionary adaptation in the plant life cycle directly eliminated the requirement for environmental water for sperm to reach the egg during fertilization?

   • A) Development of flagellated motile sperm within protected antheridia
   • B) Formation of airborne pollen grains that deliver sperm via a pollen tube
   • C) Evolution of multicellular archegonia housing non-motile egg cells
   • D) Emergence of a dominant, free-living sporophyte generation
2. 2.

   In angiosperms, which structure develops directly into the protective seed coat (testa) following double fertilization?

   • A) Integuments of the ovule
   • B) Wall of the ovary
   • C) Receptacle of the flower
   • D) Walls of the synergid cells
3. 3.

   In the life cycle of most angiosperms, what cellular and nuclear composition characterizes a fully developed female gametophyte (embryo sac)?

   • A) 8 cells and 8 nuclei
   • B) 6 cells and 7 nuclei
   • C) 7 cells and 8 nuclei
   • D) 8 cells and 7 nuclei
4. 4.

   In the life cycle of angiosperms, which of the following structures represents the mature male gametophyte?

   • A) Anther
   • B) Microsporocyte
   • C) Germinated pollen grain
   • D) Megaspore
5. 5.

   In angiosperms, double fertilization involves two sperm cells delivered by the pollen tube into the embryo sac. What are the products formed from these two respective fertilization events?

   • A) A diploid zygote and a diploid endosperm
   • B) A triploid zygote and a haploid endosperm
   • C) A diploid zygote and a triploid endosperm
   • D) A haploid zygote and a triploid endosperm

Answers and step-by-step solutions appear after you finish the test.