Behaviors and Structures That Help Reproduction
Aligned to MS-LS1-4 — Next Generation Science Standards.
What this lesson teaches
Many animal behaviors and plant structures exist because they raise the chance of producing offspring. Behaviors like nest-building, courtship displays, and protecting young, and structures like brightly colored flowers or sticky pollen, all increase reproductive success.
Worked examples
Example 1
A flower's bright petals and sweet nectar attract bees; as a bee feeds, pollen sticks to its body and travels to the next flower, fertilizing it — the flower's structure directly increases how many seeds it can make.
Example 2
A dandelion's seed parachute is a structure for reproduction too — it carries offspring far from the parent, where there is less competition.
Example 3
Some strategies favor quantity and some quality. A fish releases thousands of eggs and guards none; a bird lays three and defends them.
Practice questions
- Observe a flower and list the parts that might attract an insect or bird.
- Model how pollen moves between two flowers using a cotton swab as a pretend pollinator.
- Explain, using evidence, why a bird species that guards its eggs may leave more surviving offspring than one that does not.
Watch the lesson
Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.
▶ Watch this lessonEn español
Comportamientos y estructuras que ayudan a la reproducción
Muchos comportamientos de los animales y estructuras de las plantas existen porque aumentan la probabilidad de producir descendencia. Comportamientos como construir nidos, hacer despliegues de cortejo y proteger a las crías, y estructuras como flores de colores llamativos o polen pegajoso, todos aumentan el éxito reproductivo.
Ejemplo 1: Los pétalos brillantes y el néctar dulce de una flor atraen a las abejas; mientras una abeja se alimenta, el polen se pega a su cuerpo y viaja a la siguiente flor, fecundándola — la estructura de la flor aumenta directamente cuántas semillas puede producir.
Ejemplo 2: El paracaídas de la semilla del diente de león también es una estructura reproductiva — lleva a la descendencia lejos del progenitor, donde hay menos competencia.
Ejemplo 3: Algunas estrategias favorecen la cantidad y otras la calidad. Un pez suelta miles de huevos y no cuida ninguno; un ave pone tres y los defiende.
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