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ILTS Biology (105) Practice Tests & Test Prep by Exam Edge



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Are you ready for advancement? The ILTS Science Biology exam, administered by one of the most respected qualifying organizations in the field, is a pivotal opportunity to demonstrate your knowledge and skills. Set yourself up for exam success with practice tests from Exam Edge.

Our ILTS Science Biology practice tests are designed to help you master both the subject matter and the art of test-taking. Created to mimic the length, difficulty, and feel of the real exam, our tests feature:

  • Instant access to your online practice tests
  • Unlimited Test Access - available 24/7
  • Timed, untimed, and "study guide" modes
  • Detailed explanations for each question
  • 20 online practice exams with 100 unique questions per exam
  • 2,000 unique questions, if you purchase all 20 exams

Start your exam prep today with an Exam Edge ILTS Science Biology practice test!

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ILTS Biology (239) Shortcuts

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Pass Your ILTS Science Biology Certification Exam with Exam Edge

Are you nervous about your upcoming ILTS Science Biology certification exam? Look no further, Exam Edge is here to help you achieve your goal! Our world-class online practice certification tests are designed to provide you with the knowledge and confidence you need to pass your ILTS Biology exam on your first try!

Key Facts on Exam Edge's online practice tests for your ILTS Science Biology Exam.

  • 20 Online Practice Exams: With Exam Edge, you'll have access to 20 practice tests available, each with 100 questions, to help you thoroughly prepare for your ILTS Biology (239) exam.
  • Instant Access: Get started right away with instant access to your online practice exams. No waiting or software installation required!
  • Detailed Explanations: Each question is accompanied by a detailed explanation, so you'll fully understand the reasoning behind the correct answer and improve your knowledge.
  • Take Each Exam 4 Times: You can take each of our practice exams up to 4 times, giving you plenty of opportunities to review and master the material.
  • Web-Based: Our practice tests are available 24/7 at your convenience, and because they are web-based, there is no software to install.
  • Psychological advantage: Exam Edge practice tests will allow you to walk into your test day with confidence.

Exam Edge practice tests are a valuable tool for helping you prepare for the Illinois Licensure Testing System (239) certification exam. The practice tests provide a realistic simulation of the actual exam, allowing you to become familiar with the format, style, and types of questions you will encounter on the actual test. Certification exams don't just measure what you know -- they are also a test of how well you perform under pressure. The right type of test preparation helps you familiarize yourself not only with the material you're being tested on, but also the format of the test, so you feel less anxiety on test day.

ILTS Science Biology - General Exam Info Sample Questions

Which of the following best describes the principle of competitive exclusion?





Correct Answer:
two species cannot share the same niche within a habitat.


the principle of competitive exclusion, also known as gause's law, states that two species competing for the exact same resources cannot stably coexist if other ecological factors remain constant. when two species vie for the same niche, one species will outcompete the other, leading either to the extinction of the less competitive species or to an evolutionary or behavioral shift toward a different ecological niche.

the core idea behind this principle is that each species has its own set of natural advantages and adaptations that allow it to thrive in particular environmental niches. niches are multidimensional, including not just the physical space a species occupies but also its role in the ecosystem, such as what it eats, where it lives, and how it interacts with other species. when two species try to occupy the same niche, they compete for the same resources (food, space, etc.), which are limited.

the outcome of this competition is determined by which species can use the resources more efficiently. over time, the less efficient competitor will either adapt to a different niche, migrate to a different area, or face extinction. this principle has been observed in many ecological studies and has significant implications for understanding biodiversity and the organization of communities in nature.

in practical terms, the principle of competitive exclusion is important for conservation efforts, resource management, and understanding the impacts of invasive species. it helps explain why certain invasive species can dramatically alter existing ecosystems by outcompeting native species for their niches, leading to shifts in the community structure and sometimes to the extinction of native species.

therefore, the correct answer that "two species cannot share the same niche within a habitat" encapsulates the essence of the competitive exclusion principle by emphasizing the impossibility of coexistence within the same niche without evolutionary or ecological changes.


ILTS Science Biology (239) Exam Prep

Our comprehensive ILTS Science Biology practice tests are designed to mimic the actual exam. You will gain an understanding of the types of questions and information you will encounter when you take your Illinois Licensure Testing System Certification Exam. Our ILTS Biology Practice Tests allow you to review your answers and identify areas of improvement so you will be fully prepared for the upcoming exam and walk out of the test feeling confident in your results.

How to Prepare for the ILTS Science Biology Exam

So, you've decided to pursue your ILTS Biology certification. Not sure what comes next? Follow these steps to register for the exam, craft an effective study plan, and go into test day feeling confident.

Step 1: Check Eligibility and Apply for ILTS Science Biology

Start by researching the testing agency or credentialing organization and the different exams they offer for your field. Before you register for your exam, make sure that the ILTS Biology exam is the right match for your education, experience, and career goals.

Then, check whether you meet the requirements for taking the ILTS Biology exam. You can find eligibility information on the Illinois Licensure Testing System website: Illinois Licensure Testing System (ILTS). Once you have determined that you meet the qualifications or have completed the appropriate prerequisites, you can register with the organization and apply to take the ILTS Biology exam.

Step 2: Schedule the ILTS Biology

Once you have registered, you are ready to schedule your exam! The ILTS Science Biology exam is offered at various times throughout the year and at various locations across the United States. You can use the Illinois Licensure Testing System website to find a testing center near you and choose a date and time that suits your availability.

When you schedule your ILTS Biology exam, consider how much time you want to study and prepare. Choose a test date that gives you plenty of time to create a study plan, thoroughly review the material, and take several practice tests so that you can go into test day feeling confident and ready. Be sure to schedule your exam well in advance to secure your preferred date and time.

Step 3: Study and Practice for the ILTS Science Biology

After you schedule your test day, dive into your ILTS Biology study plan! Before you crack open a book or start reviewing exam flashcards, take a timed practice test to get a raw baseline of your readiness. As you continue your exam prep, take regular practice tests to track your progress.

Exam Edge practice tests for the ILTS Biology exam offer test-takers key benefits, like helping you identify areas where you need further study and practice. These insights into your test performance will empower you to focus your test prep efforts and prioritize the content areas or skills. This can help you use your study time more effectively and make the most of your efforts before you take the actual exam

Practice tests can also help you to develop your test-taking skills. When you take frequent practice exams, you become more familiar with the format of the ILTS Science Biology exam and learn how to pace yourself throughout it. You will also learn how to approach different types of questions and how to eliminate incorrect answers.

Ultimately, Exam Edge practice tests can help you build your confidence and reduce test-taking anxiety as you become a more comfortable and strategic test-taker. Incorporate ILTS Biology practice exams into your study plan to set yourself up for success on test day

Check out our resources to learn more about ILTS Biology test prep and practice tests.

Step 4: Take the ILTS Science Biology

On the day of the exam, arrive at the test center early to allow plenty of time to check in and get settled at your testing station. You will need to bring at least one valid, government-issued ID with you. Check on the Illinois Licensure Testing System (ILTS) website for other requirements, like:

  • Additional forms of identification
  • Required materials or supplies
  • Other recommended or permitted items, such as water or snacks
  • Prohibited items
The website will also include important information about procedures for check-in, security, and breaks, if applicable.

Once you are settled in your seat or at your testing station, take a moment to center yourself and visualize how to ace the ILTS Science Biology exam. Your diligent studying and use of practice tests have prepared you to tackle the exam with confidence. Trust yourself and your exam prep, pace yourself as you have practiced, and have fun showing off what you know!

ILTS Science Biology Exam Prep

Practice tests are a valuable tool for helping you prepare for the ILTS Biology exam. At Exam Edge, we focus on making our clients' career dreams come true by offering world-class practice tests designed to cover the same topics and content areas tested on the actual ILTS Biology. Our practice tests provide a realistic simulation of the actual exam, allowing you to become familiar with the format, style, and types of questions you will encounter on the actual test.

Location Information and Website

For more information on scheduling the Illinois Licensure Testing System exam, visit our Illinois Licensure Testing System (ILTS) information page.


ILTS Science Biology Aliases Test Name

Here is a list of alternative names used for this exam.

  • ILTS Science Biology
  • ILTS Science Biology test
  • ILTS Science Biology Certification Test
  • ILTS Biology test
  • ILTS
  • ILTS 239
  • 239 test
  • ILTS Science Biology (239)
  • Science Biology certification