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128 free Plants trivia questions with answers — nature quiz, new questions added Aug 2026.
50 free plants trivia questions with answers. Did you know that plants produce about 80% of the oxygen we breathe? Test your botanical knowledge with our comprehensive 128-question Plants quiz covering everything from photosynthesis to rare species. You'll learn surprising facts about the green world around you while challenging yourself against trivia questions that span beginner to expert levels.
30 of 128 questions with answers and explanations. Play the quiz
Q 01What pigment gives most plants their green color?
Chlorophyll
Chlorophyll is the green pigment found in chloroplasts that absorbs light energy for photosynthesis. It reflects green wavelengths, giving plants their characteristic color.
Q 02What gas do plants absorb from the atmosphere during photosynthesis?
Carbon dioxide
Plants absorb carbon dioxide (CO2) from the atmosphere through tiny pores called stomata. During photosynthesis, CO2 is combined with water using light energy to produce glucose and oxygen.
Q 03In which part of a plant cell does photosynthesis primarily occur?
Chloroplast
Photosynthesis takes place in chloroplasts, which contain chlorophyll and the molecular machinery needed to convert light energy into chemical energy (glucose).
Q 04What is the main product plants create through photosynthesis?
Glucose
Photosynthesis produces glucose (a simple sugar) as its primary product. Plants then use this glucose as an energy source or convert it into other molecules like starch and cellulose.
Q 05What are the tiny pores on the surface of leaves called that allow gas exchange?
Stomata
Stomata are microscopic pores found mainly on the underside of leaves. They open and close to regulate gas exchange (CO2 in, O2 out) and water loss through transpiration.
Q 06What part of a flower produces pollen?
Anther
The anther is the pollen-producing part of the stamen (the male reproductive organ of a flower). Pollen grains contain the male gametes needed for fertilization.
Q 07What is the process by which water moves up through a plant from roots to leaves?
Transpiration
Transpiration is the process by which water evaporates from leaf surfaces, creating a pull that draws water upward through the xylem from the roots. This transpiration stream carries water and dissolved minerals throughout the plant.
Q 08What type of plant tissue transports water from roots to leaves?
Xylem
Xylem is the vascular tissue responsible for transporting water and dissolved minerals upward from the roots. It consists of dead, hollow cells that form continuous tubes through the plant.
Q 09What is the female reproductive part of a flower called?
Pistil
A pistil is made of stigma, style and ovary; the stamens around it make up the male androecium.
Q 10Which of these is NOT a part of a typical flower?
Node
A node is the point on a stem where leaves attach; the four whorls of a typical flower are sepals, petals, stamens and pistils.
Q 11What is the tallest species of tree in the world?
Coast redwood
Coast redwoods (Sequoia sempervirens) are the tallest trees; Hyperion, found in northern California in 2006, measured about 116 metres, taller than any giant sequoia or Douglas fir.
Q 12What is the largest tree by volume in the world?
Giant sequoia
The giant sequoia (Sequoiadendron giganteum) is the largest tree by volume. General Sherman, the largest known specimen in Sequoia National Park, has a volume of about 1,487 cubic meters.
Q 13What does a Venus flytrap primarily catch for nutrients?
Insects
Venus flytraps catch insects and the odd spider; the trap only snaps shut when a trigger hair is touched twice within about twenty seconds, which stops it wasting energy on raindrops and debris.
Q 21What do botanists call the transfer of grains from a flower's anther to its stigma?
Pollination
Pollination is the transfer of pollen from the male anther to the female stigma; wind, insects, birds, bats or water carry the grains, setting up fertilisation and seeds.
Q 22Which insect do beekeepers truck from field to field in hives to pollinate food crops?
Honeybee
Crop pollination is a major share of the western honey bee's commercial value; wild pollinators have dwindled as fields have grown.
Q 23What is a plant that completes its entire life cycle in one growing season called?
Annual
Wheat, corn and most garden vegetables are annuals; biennials take two seasons and perennials keep going.
Q 14Which carnivorous plant uses a pitfall trap filled with digestive fluids?
Pitcher plant
Pitcher plants (families Sarraceniaceae and Nepenthaceae) use modified leaves shaped like pitchers to trap insects. Prey fall in and cannot escape due to slippery walls, then are digested by enzymes in the fluid.
Q 15What is the part of a seed that develops into the new plant?
Embryo
The embryo is the tiny living plant inside a seed that will germinate and grow into a new plant. It contains the embryonic root (radicle), shoot (plumule), and one or two seed leaves (cotyledons).
Q 16What is the function of the endosperm in a seed?
Feeding the embryo
In wheat and corn the endosperm makes up most of the grain, which is why it feeds people as well as embryos.
Q 17How many seed leaves does a grass seedling have?
One
Grasses are monocots and sprout one seed leaf (cotyledon), as do lilies, orchids and palms; beans and sunflowers, with two, are dicots.
Q 18What do we call trees that drop all their leaves each year, usually in autumn?
Deciduous
Deciduous trees such as oaks, maples and birches shed all their leaves in autumn to cut water loss in the cold or dry season; the word comes from Latin decidere, 'to fall off'.
Q 19What is the largest individual flower by diameter in the world?
Rafflesia arnoldii
Rafflesia arnoldii produces the largest individual flower, reaching up to 1 meter (3 feet) in diameter and weighing up to 11 kg. It is a parasitic plant found in Southeast Asian rainforests and emits a rotting flesh smell.
Q 20What type of plant reproduces via spores rather than seeds?
Fern
Ferns reproduce by spores, which form in sporangia clustered into sori, the brown dots on the underside of the fronds; roses, sunflowers and apple trees all set seed.
Q 24What is the most widely grown cereal crop in the world by production?
Corn (maize)
Corn (maize) is the most-produced cereal: world output reached about 1.16 billion tonnes in 2020, ahead of wheat and rice at roughly 760 million tonnes each.
Q 25What ecological role do plants play as the base of most food chains?
Producers
Nearly all energy in food webs starts with producers converting sunlight into chemical energy through photosynthesis.
Q 26What is the symbiotic relationship between fungi and plant roots called?
Mycorrhiza
Mycorrhiza is a mutualistic association between fungi and plant roots. The fungus helps the plant absorb water and minerals (especially phosphorus), while the plant provides the fungus with sugars from photosynthesis.
Q 27Which growing method, used for greenhouse lettuce and tomatoes, raises plants with their roots in nutrient-rich water instead of soil?
Hydroponics
Hydroponics literally means 'water working'; the roots may be held in an inert medium such as perlite or clay pebbles.
Q 28Which part of the rice plant do we eat?
Seed
The seed is milled to strip its outer layers; how much is removed decides whether you get brown rice or white.
Q 29What is the process of growing a new plant from a cutting of an existing plant?
Vegetative propagation
Vegetative propagation (also called cloning) is a form of asexual reproduction where a new plant grows from a fragment of the parent plant, such as a stem cutting, leaf, or root division.
Q 30Which biome has the greatest diversity of plant species?
Tropical rainforest
Rainforests hold about half of the world's plant and animal species and two-thirds of all flowering plants.