Podcast
Questions and Answers
What is the term used for the entry of the pollen tube through the chalazal end of the embryo sac?
What is the term used for the entry of the pollen tube through the chalazal end of the embryo sac?
During double fertilization, which structures are formed as a result of the fusion of male gametes?
During double fertilization, which structures are formed as a result of the fusion of male gametes?
Which of the following correctly describes the relationship between chromosomes in the endosperm and its gametes?
Which of the following correctly describes the relationship between chromosomes in the endosperm and its gametes?
What structure arises from the lower tier of the octant stage of embryo development?
What structure arises from the lower tier of the octant stage of embryo development?
Signup and view all the answers
What are the coverings of the shoot apex and root apex called?
What are the coverings of the shoot apex and root apex called?
Signup and view all the answers
What is the function of the scion in grafting?
What is the function of the scion in grafting?
Signup and view all the answers
Which part of the flower is composed of four pollen sacs?
Which part of the flower is composed of four pollen sacs?
Signup and view all the answers
How many meiotic divisions are needed to produce 576 haploid microspores from 24 microspore mother cells?
How many meiotic divisions are needed to produce 576 haploid microspores from 24 microspore mother cells?
Signup and view all the answers
What type of plant is Zostera classified as?
What type of plant is Zostera classified as?
Signup and view all the answers
What is the role of the micropyle in the ovule?
What is the role of the micropyle in the ovule?
Signup and view all the answers
What occurs when the secondary nucleus in the embryo sac forms?
What occurs when the secondary nucleus in the embryo sac forms?
Signup and view all the answers
Which of the following statements about self-pollination is true?
Which of the following statements about self-pollination is true?
Signup and view all the answers
Which type of plants prevent self-pollination through their unisexual flower structures?
Which type of plants prevent self-pollination through their unisexual flower structures?
Signup and view all the answers
Study Notes
Plant Reproduction: MCQs
- Reproductive roots are found in Sweet Potato and Asparagus.
- In grafting, the stock is the rooted part of the parent plant, and the scion is the budded part grafted onto the stock.
- The anther, the male reproductive part of a flower, typically contains four pollen sacs (tetrasporangiate).
- The endosperm is the innermost layer of the ovule, while the epidermis is the outermost layer.
- A mature gametophyte in a flowering plant is a pollen grain, produced from a microspore mother cell after one meiosis followed by two mitoses.
- If there are 24 microspore mother cells, 24 meiotic divisions are needed to produce 576 haploid microspores.
- A microspore mother cell with 40 chromosomes will produce four haploid microspores with 20 chromosomes each after meiosis.
- The micropyle of the ovule is adjacent to the funicle, which attaches the ovule to the ovary wall.
- The secondary nucleus in the embryo sac is formed by the fusion of two polar nuclei.
- Antipodal cells and the egg cell are haploid, while the embryo sac and the primary endosperm nucleus are diploid and triploid, respectively.
- The embryo sac is the female gametophyte, containing the egg cell, the mature female gamete.
- Only one functional megaspore out of four (resulting from meiosis of the megaspore mother cell) forms the embryo sac.
- The primary endosperm nucleus is formed by the fusion of the secondary nucleus and a male gamete.
- A root cell with 14 chromosomes (diploid) will have 7 chromosomes (haploid) in its gametes.
- Self-pollination is an economical method, maintaining genetic stability, but it does not eliminate undesirable characters and promotes inbreeding depression.
- Zostera is a hydrophyte (water-loving plant), while other species like Lotus rely on insects or wind for pollination.
- Dioecious plants, like papaya, are unisexual (possessing only male or female flowers) and prevent self-pollination and autogamy and xenogamy.
- The stigma positioned above the anthers is a herkogamy mechanism, an outbreeding device in plants like Calotropis.
- Pollination steps: pollen grain deposition on the stigma, pollen grain germination, pollen tube development, pollen tube entry into the ovule, and pollen tube entry into the embryo sac.
- During double fertilization, one male gamete fuses with the egg cell to form the zygote, and the other male gamete fuses with the secondary nucleus to form the primary endosperm nucleus.
- Pollen tube entry directly through the chalazal end of the embryo sac is called chalazogamy.
- An endosperm with 24 chromosomes (triploid) will have 8 chromosomes in its gametes (haploid) and 16 chromosomes in its megaspore mother cell (diploid).
- The lower tier of the octant stage of embryo development gives rise to the hypocotyl and radicle.
- The coleoptile is the covering of the plumule (shoot apex), and the coleorhiza is the covering of the radicle (root apex).
- During double fertilization, a total of five nuclei are involved.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge with this quiz on plant reproduction, covering essential concepts such as reproductive structures, grafting, and gametophyte formation. Each question aims to enhance your understanding of how plants reproduce and the biological processes involved.
