Plant Life Cycles

Grade 5 · Science · Study Guide

Trace how plants grow from seeds through germination, growth, reproduction, and back to seeds again.

Plants go through a life cycle just like animals do. Most flowering plants follow the same basic pattern: seed, germination, seedling, mature plant, flower, pollination, fruit, and back to seed. This cycle can take anywhere from a few weeks (like a bean plant) to thousands of years (like a bristlecone pine).

A seed is an amazing survival package. Inside every seed is a tiny plant embryo, a supply of stored food (cotyledons), and a protective seed coat. When conditions are right — enough water, warmth, and sometimes light — the seed germinates. The seed absorbs water, swells, and the embryo begins to grow. The root pushes down to anchor the plant and absorb water, while the shoot pushes up toward light. This early growth uses the food stored in the seed before leaves are big enough to photosynthesize.

Once the plant matures, it produces flowers. Flowers are the plant's reproductive organs. They contain male parts (stamens) that produce pollen and female parts (pistils) that contain eggs. Pollination happens when pollen moves from a stamen to a pistil — often carried by wind, bees, butterflies, or even bats and birds. After fertilization, the ovary grows into a fruit that protects the seeds inside.

Seeds need to travel away from the parent plant to find space, sunlight, and nutrients. Plants have evolved incredible seed dispersal strategies: dandelion seeds float on the wind, coconuts float on ocean currents, burrs stick to animal fur, and animals eat berries and deposit seeds in their droppings far from where they were eaten.

Key terms

Germination: The process by which a seed begins to grow into a seedling.
Pollination: The transfer of pollen from a stamen to a pistil, enabling fertilization.
Cotyledon: Seed leaf that stores food for the embryo during germination.
Photosynthesis: The process plants use to convert sunlight, water, and CO2 into sugar and oxygen.
Seed dispersal: The movement of seeds away from the parent plant by wind, water, animals, or other means.
Fertilization: The joining of a pollen cell and an egg cell to form a new seed.

Flashcards

Germination: When a seed absorbs water and begins to grow into a seedling.
Pollination: Transfer of pollen from stamen to pistil; required for fertilization.
Seed dispersal: Movement of seeds away from the parent plant by wind, water, or animals.
Stamen: The male reproductive part of a flower that produces pollen.
Pistil: The female reproductive part of a flower that contains eggs.
Cotyledon: Seed leaf that provides stored food to the plant embryo during germination.

Practice questions

What is the correct order of a flowering plant's life cycle?
1. Flower → Seed → Germination → Mature plant
2. Seed → Germination → Mature plant → Flower
3. Germination → Seed → Flower → Mature plant
4. Mature plant → Germination → Seed → Flower
Show answer
Answer: Seed → Germination → Mature plant → Flower
The correct sequence is: seed → germination → seedling/mature plant → flower → pollination/fertilization → fruit/seeds.
During germination, the seedling uses stored food from the cotyledons before it can photosynthesize.
Show answer
Answer: True
Before a seedling's leaves are large enough to photosynthesize, it relies entirely on food stored in the cotyledons (seed leaves).
The transfer of pollen from a stamen to a pistil is called ___.
Show answer
Answer: pollination
Pollination is the first step in sexual reproduction for flowering plants; fertilization occurs after pollen reaches the pistil.
Which of the following is a method of seed dispersal by wind?
1. Coconut floating on water
2. Burr sticking to fur
3. Dandelion seed with a feathery parachute
4. Animal eating a berry
Show answer
Answer: Dandelion seed with a feathery parachute
Dandelion seeds have feathery structures called pappus that act like parachutes, letting the wind carry them long distances.
A fruit is formed from the ovary of a flower after fertilization.
Show answer
Answer: True
After fertilization, the ovary wall thickens and develops into the fruit, which surrounds and protects the seeds.

Fun facts

The oldest known seed to successfully germinate was a 32,000-year-old narrow-leafed campion seed found frozen in Siberian permafrost — scientists grew it into a flowering plant!
A coconut is actually a seed — one of the largest seeds on Earth. It can float thousands of miles across the ocean and still germinate on a distant beach.

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