Problem 6 - Biology Concepts and Applications

Question

A tick is a(n) _____. a. brood parasite b. ectoparasite c. endoparasite

Step-by-Step Solution

Answer

A tick is an ectoparasite.

Step 1: Identify the Terms

Examine the terms 'brood parasite,' 'ectoparasite,' and 'endoparasite.' A 'brood parasite' uses another species to raise its offspring. An 'ectoparasite' lives on the surface of its host. An 'endoparasite' lives inside the host.

Step 2: Analyze the Host-Relation

Ticks attach to the surface of other animals to feed on their blood. They do not lay eggs in another's nest, nor do they live inside a host's body like an endoparasite.

Step 3: Select the Correct Option

Based on the fact that ticks live on the exterior of their host and feed externally, the correct term that describes a tick is 'ectoparasite.'

Key Concepts

Brood Parasite

A brood parasite is a fascinating creature in the animal world. Instead of raising their own young, brood parasites rely on other species to do the hard work. They lay their eggs in the nest of a host species, tricking the hosts into rearing their offspring. This unusual form of parenting allows brood parasites to invest their energy into producing more eggs rather than nurturing.

• Brood parasites are typically birds, such as cuckoos and cowbirds.
• This strategy provides their young with safety and food without the parent having to care for them directly.
• Host species often have no idea they're caring for a brood parasite's young.

This relationship, while advantageous to the parasite, can be quite costly for the host, as they unknowingly care for a foreign chick, taking resources away from their young.

Endoparasite

Endoparasites are organisms that reside inside their host. These types of parasites have adapted to live and feed within the bodies of their hosts, often inside the intestines, tissues, or blood.

• Common examples of endoparasites include tapeworms, roundworms, and flukes.
• They have developed various strategies to remain undetected by the host's immune system.
• Some even have complex life cycles involving multiple hosts.

The relationship is beneficial for the parasite but detrimental to the host, as endoparasites can cause diseases or reduce the host's vitality by consuming their nutrients.

Host-Parasite Relationship

The host-parasite relationship is a complex and varied interaction where the parasite benefits at the expense of the host. This type of symbiotic relationship has evolved over millions of years.

• Parasites can range from simple organisms like viruses to more complex beings like insects and worms.
• They typically do not kill their host immediately, as they rely on them for survival.
• Hosts, over time, may develop defenses against parasites, leading to an evolutionary arms race.

Understanding the dynamics of this relationship helps in the study of ecology and in devising methods to prevent and control parasitic diseases.