The way in which the loss of genetic and morphological traits is responsible for an autotrophic lifestyle has caused plants to become holoparasites. Introduction: When an organism lives and feeds off another organism, it is termed as a parasite. Parasites can either be completely dependent on the host (obligate) or can be partially dependent (facultative). In evolutionary biology, parasitism refers to the relationship present between the species wherein one of the organisms is a parasite, while another one is the host.

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 35.5, Problem 3R

Summary Introduction

To review:

The way in which the loss of genetic and morphological traits is responsible for an autotrophic lifestyle has caused plants to become holoparasites.

Introduction:

When an organism lives and feeds off another organism, it is termed as a parasite. Parasites can either be completely dependent on the host (obligate) or can be partially dependent (facultative). In evolutionary biology, parasitism refers to the relationship present between the species wherein one of the organisms is a parasite, while another one is the host.

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Which of the following explains why pea plants in high soil nitrogen conditions have so few rhizobial nodules on their roots? When there is already high soil nitrogen there is a very large cost to having rhizobial nodules. The rhizobia bacteria in the nodules fix nitrogen when there isn't enough in the soil, so when there is already high soil nitrogen there is no advantage for the pea plant to expend the extra energy housing the rhizobia. The rhizobia bacteria in the nodules use nitrogen when there isn't enough in the soil, so in conditions of high soil nitrogen the plant tries to exclude the rhizobia to keep the nitrogen for itself. When there is already high soil nitrogen there is no benefit to the plant to having rhizobial nodules, which can rob the plant of the high nitrogen supplies so that the rhizobia bacteria do not have to fix the nitrogen themselves.

In the early 1800s, potatoes became the main food staple for the people of Ireland. In 1845, a fungus native to South America, Phytophthora infestans, began to infect potato plants, causing potato blight and making the tubers inedible. Over the next several years, most of the potato plants in the country were destroyed by this invasive species. Which of the following statements correctly explains why the Irish potato famine occurred? A - The arrival of ships from South America led to human introduction of the disease. B - A drought across Ireland in 1844 led to more damaged potato plants that were susceptible to infection. C - An increase in trade with other European countries led to the introduction of plants that were already infected with the fungus. D - Ireland’s climate became closer to that of South America, which allowed the fungus to infect potato plants and reproduce.

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Answer 2

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 35.5, Problem 3R

Summary Introduction

To review:

The way in which the loss of genetic and morphological traits is responsible for an autotrophic lifestyle has caused plants to become holoparasites.

Introduction:

When an organism lives and feeds off another organism, it is termed as a parasite. Parasites can either be completely dependent on the host (obligate) or can be partially dependent (facultative). In evolutionary biology, parasitism refers to the relationship present between the species wherein one of the organisms is a parasite, while another one is the host.

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Answer 3

Question

Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 35.5, Problem 3R

Summary Introduction

To review:

The way in which the loss of genetic and morphological traits is responsible for an autotrophic lifestyle has caused plants to become holoparasites.

Introduction:

When an organism lives and feeds off another organism, it is termed as a parasite. Parasites can either be completely dependent on the host (obligate) or can be partially dependent (facultative). In evolutionary biology, parasitism refers to the relationship present between the species wherein one of the organisms is a parasite, while another one is the host.

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Check out a sample textbook solution

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Answer 4

Question

Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 35.5, Problem 3R

Summary Introduction