/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 15 In plant life cycles (a) the fir... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 27: Problem 15

In plant life cycles (a) the first products of meiosis are gametes (b) spores are part of the diploid sporophyte generation (c) the embryo gives rise to a zygote (d) the first stage in the diploid sporophyte generation is the zygote (e) the first stage in the haploid gametophyte generation is the prothallus

Short Answer

Expert verified
The correct statement is (d).

Step by step solution

01

Determine the Correct Answer

Analyze each option given for the exercise and identify if it correctly describes a part of the plant life cycle. Recall the alternation of generations in plants involves switching between diploid and haploid stages, where sporophytes are diploid and gametophytes are haploid.
02

Analyze Option (a)

Option (a) states that the first products of meiosis are gametes. In plant life cycles, the first products of meiosis are not gametes but spores, which are part of the haploid generation. Therefore, this option is incorrect.
03

Analyze Option (b)

Option (b) claims that spores are part of the diploid sporophyte generation. This is incorrect because spores are actually part of the haploid phase and give rise to gametophytes.
04

Analyze Option (c)

Option (c) suggests the embryo gives rise to a zygote. This is incorrect; rather, a zygote develops into an embryo.
05

Analyze Option (d)

Option (d) states the first stage in the diploid sporophyte generation is the zygote. This is correct, as after fertilization, the zygote develops into the sporophyte.
06

Analyze Option (e)

Option (e) claims the first stage in the haploid gametophyte generation is the prothallus. This is incorrect. In ferns, for example, the first stage is actually the spore that develops into a gametophyte, sometimes referred to as a prothallus, but this isn't the starting stage of the entire gametophyte phase.
07

Conclusion: Select Correct Answer

Based on the analysis, the only correct statement is option (d), which accurately describes the first stage of the diploid sporophyte generation in plant life cycles.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

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

Alternation of Generations
The plant life cycle is unique and fascinating because it involves **alternation of generations**. This is the process where plants alternate between two different stages: the diploid and haploid stages.
During this cycle, plants undergo both sexual and asexual reproduction. The **diploid stage** is called the sporophyte generation, while the **haploid stage** is known as the gametophyte generation. Each generation gives rise to the other.
Here's how it works:
  • In the diploid sporophyte phase, plants produce spores through meiosis. These spores are haploid, meaning they contain only one set of chromosomes.
  • These haploid spores grow into gametophytes, representing the haploid phase of the cycle.
  • The gametophytes produce gametes (sperm and eggs). During fertilization, these gametes combine to form a zygote, beginning a new diploid sporophyte generation.
This continuous cycle of alternation of generations ensures genetic diversity and adaptation in plants.
Sporophyte Generation
In the **sporophyte generation**, plants are in the diploid phase of their life cycle. This phase begins with the formation of a zygote, which is the result of the fusion of gametes during fertilization. The zygote then grows into a new sporophyte plant.
The sporophyte plant is characterized by having two sets of chromosomes and typically dominates the life cycle of plants such as ferns and seed plants. Here are some key aspects:
  • The sporophyte is responsible for producing spores through meiosis. These spores are haploid and essential for the continuation of the plant's life cycle.
  • The diploid phase often provides the structure and support to the plant, enabling it to grow larger and become more complex.
As the mature sporophyte releases spores, the cycle transitions to the gametophyte generation, continuing the cycle of alternation of generations.
Gametophyte Generation
The **gametophyte generation** is the haploid phase in the plant life cycle, where the plant's cells contain only one set of chromosomes. This phase starts with the germination of haploid spores produced by the sporophyte.
In this stage, the gametophyte grows and develops structures that produce gametes. These gametes are the reproductive cells that lead to the next generation. Here is the process overview:
  • Gametophytes produce male and female gametes (sperm and egg cells).
  • Fertilization of these gametes leads to the formation of a diploid zygote.
  • This diploid zygote will grow into the new sporophyte plant, thus continuing the cycle.
In some plants, such as mosses, the gametophyte generation is the dominant phase of the life cycle, while in others, it is less prominent but still crucial for reproduction. Understanding this part of the cycle highlights the diversity and complexity of plant life.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

These plants have vascularized stems but lack true roots and leaves. (a) mosses (b) club mosses (c) horsetails (d) whisk ferns (e) hornworts

Liverworts and hornworts share life-cycle similarities with (a) ferns (b) mosses (c) horsetails (d) club mosses (e) whisk ferns

Seedless vascular plants have ________ to conduct water and minerals and _________ to conduct sugar. (a) cuticle; xylem (b) phloem; stomata (c) phloem; xylem (d) stomata; cuticle (e) xylem; phloem

Stomata (a) help prevent desiccation of plant tissues (b) transport water and minerals through plant tissues (c) allow gas exchange for photosynthesis (d) strengthen cell walls (e) produce male gametes

The green, gametangia-bearing moss plant (a) is the haploid gametophyte generation (b) is the diploid sporophyte generation \((\mathrm{c})\) is called a protonema (d) contains cells with single large chloroplasts (e) b and c
See all solutions

Recommended explanations on Biology Textbooks

Cell Communication

Read Explanation

Biological Structures

Read Explanation

Energy Transfers

Read Explanation

Cellular Energetics

Read Explanation

Substance Exchange

Read Explanation

Biological Molecules

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.