IPA KELAS 7 : Kunci Determinasi

Summary

In this 7th-grade science lesson, the teacher introduces the concept of a determination key, a tool used to classify living organisms based on observable morphological traits. The lesson covers the purpose and use of determination keys (also called dichotomy keys) to identify animals and plants. Examples are provided, including how to classify a goat, snake, and snail using the key. The teacher explains the process step by step, ensuring students understand how to navigate through the choices and identify species. The session concludes with encouragement to ask questions and engage with the material further.

Takeaways

• 😀 The lesson begins with an apology for the teacher’s hoarse voice due to a cold.
• 😀 A prayer is offered to ensure that the knowledge gained is useful and that resources like internet data are also helpful.
• 😀 The class will be discussing the 'Determination Key,' a method used for identifying organisms.
• 😀 The Determination Key is a list of descriptions that helps in identifying organisms based on their morphological characteristics.
• 😀 The Determination Key is also known as the Dichotomy Key, where choices are presented in pairs (A or B) to guide identification.
• 😀 The purpose of the Determination Key is to help identify and group unknown organisms, especially when encountering new species.
• 😀 An example of how a Determination Key is used involves recognizing a goat: starting with whether the goat has a backbone, proceeding through choices to classify it as a mammal.
• 😀 The example of a snake determination key follows a similar process: identifying whether it has a backbone, is scaly, and determining its classification as a reptile.
• 😀 Another example involves identifying a snail, which has a soft body and a shell, leading to its classification as a mollusk.
• 😀 The key takeaway from the lesson is the importance of using the Determination Key method to classify and understand different life forms in nature.
• 😀 The teacher encourages students to repeat the video and ask questions if they are still confused, ensuring that the learning process is clear.

Q & A

What is a determination key?

A determination key, also known as a dichotomous key, is a list that helps in identifying organisms based on a series of descriptive choices about their physical characteristics, usually their morphological traits.

What is the main purpose of a determination key?

The main purpose of a determination key is to facilitate the identification and classification of organisms, making it easier to recognize and group living things.

How does a determination key work?

A determination key works by presenting a series of choices, usually in pairs (A and B), which help narrow down the possibilities about an organism's characteristics. You follow the numbered steps, selecting one choice at each decision point, leading you to the organism's identity.

Can you describe an example of how to use a determination key?

For example, when identifying a goat using a determination key, you start by checking if it has a backbone. If yes, you proceed to the next characteristic. If it doesn't have a backbone, you follow a different path. You continue to make choices based on features like scales or hair, until you reach the final classification.

What is the difference between 'hair' and 'fur' as used in the determination key?

In the context of the determination key, 'hair' refers to the covering on mammals, like goats, while 'fur' refers to the covering on birds. This distinction helps to identify whether the organism is a mammal or a bird.

What group do goats belong to according to the determination key?

Goats are classified as mammals according to the determination key, because they are warm-blooded, have hair (not fur), and possess other mammalian characteristics.

What are the key steps involved in identifying a snake using the determination key?

To identify a snake using the determination key, you first confirm it has a backbone. Then, check if it has scales. Next, determine whether the snake lives on land or in water. Finally, the snake is classified as a reptile.

How do you distinguish between different groups of organisms using a determination key?

A determination key allows you to distinguish between groups of organisms by following a series of characteristics. For instance, by checking whether an organism has scales, a backbone, or lives in water or on land, you can classify it into groups such as mammals, reptiles, or mollusks.

What group does a snail belong to according to the determination key?

A snail is classified in the mollusk group, as it has a soft body and a shell, which are key characteristics used in the determination key.

What should you do if you're confused about the steps in a determination key?

If you're confused, you can repeat the video explanation or refer to the key again, reviewing each step carefully to make sure you're following the choices correctly.