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Chapter 11: Problem 23

Spores are structures produced by some plants and all fungi. Which is true about them? a. Spores are haploid reproductive cells that can produce haploid organisms through mitosis. b. Spores are haploid precursors to gametes that give rise to gametes when environmental conditions are favorable. c. Spores are haploid reproductive cells that can produce diploid cells without fertilization. d. Spores are haploid cells formed only during asexual reproduction and so are not formed by meiosis.

Short Answer

Expert verified
Option A is true; spores are haploid reproductive cells that can produce haploid organisms through mitosis.

Step by step solution

01

Understand the Definition of Spores

Spores are reproductive cells used by plants, algae, fungi, and some protozoans. They are typically haploid, meaning they contain only one set of chromosomes.
02

Evaluate Option A

Option A states that spores are haploid reproductive cells that can produce haploid organisms through mitosis. This is true as spores can develop into new haploid organisms without the need for fertilization.
03

Evaluate Option B

Option B mentions that spores are haploid precursors to gametes that give rise to gametes under favorable conditions. This is incorrect as spores directly develop into new organisms and are not precursors to gametes.
04

Evaluate Option C

Option C suggests that spores produce diploid cells without fertilization. This is false as spores are haploid and result in haploid organisms, not diploid cells, without fertilization.
05

Evaluate Option D

Option D states that spores are formed only during asexual reproduction and not by meiosis. This is incorrect because spores can form by meiosis in the life cycles of fungi and some plants, and they can be involved in both sexual and asexual reproduction.
06

Determine the Correct Answer

Based on the evaluations of each option, determine that Option A is the only correct statement about spores.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Haploid Cells
In biology, haploid cells are cells that contain a single set of chromosomes. This means they have one complete set of genetic information.
Haploid cells are typically involved in reproduction and are essential in the life cycles of many organisms, particularly plants and fungi.
  • For example, human sperm and egg cells are haploid.
  • When two haploid cells from different parents combine, they can form a diploid cell with two sets of chromosomes, one from each parent.
Haploid cells are crucial for maintaining genetic diversity across generations.
Reproductive Cells
Reproductive cells are specialized cells involved in the reproduction process. They are also known as gametes, such as sperm and egg cells, or spores in plants and fungi.
Reproductive cells come in two types:
  • Gametes: These are engaged in sexual reproduction. Gametes are usually haploid and combine during fertilization to form a diploid zygote.
  • Spores: These can be involved in both sexual and asexual reproduction. Spores are typically haploid and can develop into new organisms without fertilization.
Both types of reproductive cells play a key role in the continuation and variation of species.
Mitosis
Mitosis is a process where a single cell divides to produce two identical daughter cells. It ensures that each daughter cell has the same number of chromosomes as the parent cell.
This process is crucial for growth, development, and repair in multicellular organisms.
  • During mitosis, the cell undergoes phases including prophase, metaphase, anaphase, and telophase.
  • Plant spores, for example, can use mitosis to grow into new haploid organisms.
Understanding mitosis helps in grasping how cells multiply and maintain genetic consistency.
Plant Reproduction
Plant reproduction can be a complex process, involving both sexual and asexual methods.
Sexual reproduction in plants involves the fusion of male and female gametes, while asexual reproduction鈥攍ike spore formation鈥攄oes not.
  • Sexual reproduction leads to offspring with genetic variation, ensuring adaptability and survival.
  • Asexual reproduction, like spore formation, allows plants to reproduce without the need for a mate, quickly spreading in favorable conditions.
In either case, spores play a major role in plant reproduction by giving rise to new plants capable of thriving in various environments.
Fungal Reproduction
Fungal reproduction can also occur both sexually and asexually, with spores playing a critical role in both methods.
Fungi produce spores as a means of surviving unfavorable conditions and spreading to new locations.
  • Asexual reproduction in fungi typically involves the creation of spores through mitosis, leading to genetically identical offspring.
  • Sexual reproduction involves the fusion of specialized haploid cells to form a new organism that can survive in diverse conditions.
Spores ensures that fungi can persist and adapt across a variety of environments.

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Most popular questions from this chapter

What is a likely evolutionary advantage of sexual reproduction over asexual reproduction? a. Sexual reproduction involves fewer steps. b. Sexual reproduction results in variation in the offspring. c. Sexual reproduction is more metabolically efficient. d. Sexual reproduction uses up fewer resources in a given environment.

What is a source of variation in asexual reproduction? a. crossing over of chromosomes b. mutation of DNA c. random assortment of chromosomes d. There is no variation in asexual reproduction.

Which of the following distinguishes metaphase I from metaphase II? a. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Metaphase II has a single line of chromosomes on the spindle. A Pair of chromosomes is pulled apart and migrate towards pole in anaphase I, while in anaphase II sister chromatids separate. Telophase I reconstitutes the nucleus and loosen the chromosomes, while telophase II mimics telophase I. b. Prophase I condenses the chromosomes and eliminates the nuclear membrane. The microtubules arrange in a spindle. Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Metaphase II has a single line of chromosomes on the spindle. Pairs of chromosomes are pulled apart and migrate towards the poles during anaphase I, while in anaphase II sister chromatids separate. Telophase I reconstitutes the nucleus and condenses the chromosomes, while telophase II mimics telophase I. c. Prophase I condense the chromosomes and add nuclear membrane. The microtubules arrange in a spindle. Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Metaphase II has a single line of chromosomes on the spindle. Pair of chromosomes are pulled apart and migrate towards the poles in anaphase I, while in anaphase II sister chromatids separate. Telophase I reconstitutes the nucleus and loosens the chromosomes, while telophase II mimics telophase I. d. Prophase I condenses the chromosomes and eliminates the nuclear membrane. The microtubules arrange in a spindle. Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. During Metaphase II, the chromosomes line up in a double line across the spindle. Each pair of chromosomes is pulled apart and migrate towards the poles in anaphase I, while in anaphase II sister chromatids separate. Telophase I reconstitutes the nucleus and loosen the chromosomes, while telophase II mimics telophase I.

Reproductive cells in most species are different from the cells that make up the rest of the organism. What are the 鈥渂ody鈥� cells called and how are they different from the reproductive cells? a. Body cells are called gametes and they have half the number of chromosomes found in reproductive cells. b. Body cells are called somatic cells and have the same number of chromosomes as reproductive cells. c. Body cells are called somatic cells and have double the number of chromosomes found in reproductive cells. d. Body cells are called gametes and have double the number of chromosomes found in reproductive cells.

Fungi typically display which type of life cycle? a. alternation of generations b. asexual c. diploid-dominant d. haploid-dominant
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