Internal And External Environment
Overview
Step outside on a harmattan morning in Jos and then again at midday in Lagos in the rains, and the air around you could not be more different: cold and dry, then hot and humid. Yet a healthy goat standing in either place keeps almost exactly the same body temperature, the same blood chemistry, the same steady internal state. That contrast, a constantly shifting outside against a remarkably steady inside, is the starting idea of environmental physiology and the foundation for everything this section of the syllabus will teach.
In this lesson you will learn what farm animal scientists mean by the internal environment and the external environment, the specific factors that make up each one, and how the two relate: the animal's body works continuously to hold its internal environment steady despite an external environment that never stops changing. Grasp this one relationship and the next three lessons, homeostasis, the effects of climate, and how farmers modify the environment, will all make immediate sense.
Objectives
- Define the internal environment of a farm animal
- Define the external environment of a farm animal
- Give examples of external environmental factors affecting farm animals
- Explain the relationship between the internal and external environment
- Explain how animals respond to changes in their environment
Lesson Note
Sign Up to Continue
Create a free account to access all learning resources, practice questions, and track your progress.
Lesson Evaluation
Congratulations on completing the lesson on Internal And External Environment. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The fluid medium inside an animal's body, mainly blood and tissue fluid, in which its cells actually live is called the: A. External environment B. Internal environment C. Ecosystem D. Habitat Answer: B
- Which of the following is an EXTERNAL environmental factor acting on a farm animal? A. Blood glucose level B. Body temperature C. Relative humidity of the housing D. Blood pH Answer: C
- Which of the following is an INTERNAL environmental variable of a farm animal? A. Air temperature B. Water balance C. Daylength D. Wind Answer: B
- The general relationship between an animal's internal and external environment is best described as: A. Both remain fixed and unchanging at all times B. The internal environment is kept stable despite a constantly changing external environment C. The internal environment changes to match the external environment exactly D. The external environment has no effect on the internal environment Answer: B
- A goat seeking shade under a tree at midday to avoid direct sunlight is an example of a: A. Physiological response B. Behavioural response C. Managed response D. Genetic response Answer: B
Sign Up to Continue
Create a free account to access all learning resources, practice questions, and track your progress.
Sign Up to Continue
Create a free account to access all learning resources, practice questions, and track your progress.
