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Science: Elementary School: Grades 3, 4 and 5 Quiz - Life Cycles - Plants (Questions)

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The life cycles of plants are the stages from seed to dispersal. In flowering plants the cycle goes like this: seeds in the soil germinate. They then grow roots and shoots. The next stage is a seedling which matures into an adult plant and makes flowers. Then the plant makes fruit which itself contains seeds. These are spread through dispersal and the cycle starts again. Did you know that some trees have lived for hundreds, or even thousands of years? One yew tree in Llangernyw, Wales, is believed to be at least 4,000 years old! Other plants, such as cress, only live for a few weeks.

Which of the following is true?

[ ]	All plants grow from seeds
[ ]	All plants have flowers
[ ]	All plants can reproduce
[ ]	All plants have fruit

Which of the following words describes the moment a seed begins to grow?

[ ]	Pollination
[ ]	Dispersal
[ ]	Flowering
[ ]	Germination

What is dispersal?

[ ]	The ripening of a seed pod
[ ]	The method by which a plant spreads its seeds
[ ]	The transfer of pollen to the stigma
[ ]	The length of time it takes a seed to germinate

Which part of a flowering plant is male?

[ ]	Stamen
[ ]	Stigma
[ ]	Petals
[ ]	Seeds

Which part of a flowering plant grows into a fruit?

[ ]	Petals
[ ]	Stem
[ ]	Seed
[ ]	Ovary

Which of the following plants disperses its seeds by wind?

[ ]	Beech trees
[ ]	Dandelions
[ ]	Apple trees
[ ]	Poppies

What do seeds need in order to germinate?

[ ]	Water and soil
[ ]	Sunlight and soil
[ ]	Water and warmth
[ ]	Sunlight and warmth

Why do plants need sunlight?

[ ]	Plants use sunlight to make food
[ ]	Sunlight makes plants warm
[ ]	Sunlight allows plants to flower
[ ]	Sunlight keeps plants from getting too wet

What happens if seeds are planted too closely together?

[ ]	None of the seeds will grow
[ ]	The young plants struggle to compete for moisture and nutrients
[ ]	Only one seed will grow
[ ]	The young plants will be healthier

10.

Flowering plants produce many seeds which never grow. Why do they do this?

[ ]	Because many of the seeds are defective
[ ]	Because some of the seeds will not have enough soil to germinate
[ ]	Because many of the seeds will be eaten by animals, blown away by the wind, or washed away
[ ]	Because some seeds will not receive enough food to survive

Science: Elementary School: Grades 3, 4 and 5 Quiz - Life Cycles - Plants (Answers)

Which of the following is true?

[ ]	All plants grow from seeds
[ ]	All plants have flowers
[x]	All plants can reproduce
[ ]	All plants have fruit

All plants reproduce, but not all plants reproduce by flowering

Which of the following words describes the moment a seed begins to grow?

[ ]	Pollination
[ ]	Dispersal
[ ]	Flowering
[x]	Germination

Seeds need certain conditions before they can germinate

What is dispersal?

[ ]	The ripening of a seed pod
[x]	The method by which a plant spreads its seeds
[ ]	The transfer of pollen to the stigma
[ ]	The length of time it takes a seed to germinate

Plants have several methods of dispersing seeds - by wind, by explosion, by animal, even by water - coconut palms can disperse their seeds (coconuts) by sea

Which part of a flowering plant is male?

[x]	Stamen
[ ]	Stigma
[ ]	Petals
[ ]	Seeds

The stamen produces pollen

Which part of a flowering plant grows into a fruit?

[ ]	Petals
[ ]	Stem
[ ]	Seed
[x]	Ovary

The fertilized ovary, containing seeds, develops into a fruit

Which of the following plants disperses its seeds by wind?

[ ]	Beech trees
[x]	Dandelions
[ ]	Apple trees
[ ]	Poppies

Have you ever blown the seeds from a dandelion clock?

What do seeds need in order to germinate?

[ ]	Water and soil
[ ]	Sunlight and soil
[x]	Water and warmth
[ ]	Sunlight and warmth

Seeds can germinate without light or soil, but cannot germinate in a cold, dry place

Why do plants need sunlight?

[x]	Plants use sunlight to make food
[ ]	Sunlight makes plants warm
[ ]	Sunlight allows plants to flower
[ ]	Sunlight keeps plants from getting too wet

Although seeds can germinate without sunlight, plants need it to make their food, using a process called photosynthesis

What happens if seeds are planted too closely together?

[ ]	None of the seeds will grow
[x]	The young plants struggle to compete for moisture and nutrients
[ ]	Only one seed will grow
[ ]	The young plants will be healthier

Plants need space to spread their roots and stems

10.

Flowering plants produce many seeds which never grow. Why do they do this?

[ ]	Because many of the seeds are defective
[ ]	Because some of the seeds will not have enough soil to germinate
[x]	Because many of the seeds will be eaten by animals, blown away by the wind, or washed away
[ ]	Because some seeds will not receive enough food to survive

The more seeds a plant produces, the better its chance of reproducing