Organism structures help plants and animals meet the needs of life, from absorbing water and making food to feeding, moving, breathing, and transporting materials. This Grade 4 science reading organizer explores how the structure of a body part relates to its function, using familiar plants and animals to make the science concrete.

How Plant and Animal Structures Work

Students read about the jobs performed by different external and internal structures. The plant passage connects roots, stems, and leaves: roots absorb water and minerals, stems support the plant and contain transport tissues, and leaves make food through photosynthesis. The animal examples show how body parts are suited to particular tasks.

• Plant structures: Explore how roots absorb water, stems support plants and transport materials, and leaves use sunlight to make food.
• Bird beaks: Compare a duck’s flat beak for straining food from water, a hawk’s hooked beak for tearing food, and a woodpecker’s pointed beak for reaching insects in tree bark.
• Animal teeth: Examine how rabbit incisors gnaw plants, horse molars grind tough plant food, and lion canine teeth grip and tear meat.
• Limbs and protection: Discover how a frog’s powerful back legs support leaping and swimming, an elephant’s sturdy legs support its body, and a turtle’s shell protects its soft body.
• Internal organs: Read how lungs bring oxygen into the blood, the heart pumps blood, and blood vessels carry blood around the body.

Main Idea and Supporting Details Practice

Each informational passage is organized around one central idea and supporting facts. Students identify the main idea sentence, find the details that support it, and record their answers in the accompanying graphic organizer. This gives students practice with identifying main ideas and supporting details in informational text while reading meaningful Grade 4 life science content.

The passages also provide opportunities to connect a structure with its job. Students can use evidence from the text to explain why a bird’s beak has a particular shape, how plant parts work together, or how an animal’s internal organs help keep its body supplied with oxygen and other materials.

Classroom Use

Use this organism structures reading set during a Grade 4 life science unit, as science reading practice, or for independent work. It can also support a lesson review or a discussion in which students refer to details from a passage when explaining how a structure helps an organism. The graphic organizers give students a clear way to collect information from each text rather than simply reading facts without organizing them.

For teachers covering the NGSS framework, the resource is listed with 4-LS1-1, which focuses on how internal and external structures support the survival, growth, behavior, and reproduction of plants and animals. The examples in these readings emphasize structure and function through plant parts, feeding structures, limbs, protective shells, and organs involved in breathing and circulation.