Plant Responses

Front 1

Meristem

Back 1

Growing part of the plant for cell division

Front 2

Root cap

Back 2

At tip of root, protects delicate meristem cells

Front 3

Tropism

Back 3

Growth response towards or away from an environmental stimulus coming from one direction. Can be positive (towards) or negative (away from)

Front 4

Nastic

Back 4

Responses of plants to diffuse stimuli

Front 5

Phytochrome

Back 5

Controls development and flowering

Front 6

Chlorophyll and carotenoids

Back 6

Runs photosynthesis

Front 7

Riboflavin and beta carotene

Back 7

Present in the coleoptiles

Front 8

Flavins

Back 8

Membrane bound pigments (something that absorbs certain wavelengths of light) systems

Front 9

Phototropism

Back 9

A growth towards or away from light. Can be neg or pos

Front 10

Geotropism

Back 10

A growth towards or away from sunlight. Can be pos or neg

Front 11

Thigmotropism

Back 11

Response to touch. Can be neg or pos. Eg. A change in the direction of growth of plant caused by touch

Front 12

Hydrotropism

Back 12

Growth towards or away from water . Can be neg or pos

Front 13

Auxin

Back 13

Produced in meristem. Causes elongation of cells on side away from light. Plant will grow and bend towards light

Front 14

Abscisic acid

Back 14

A plant hormone. It functions in many plant developmental processes, particularly bud dormancy

Front 15

Abscission

Back 15

The process whereby a plant sheds parts, particularly leaves, fruit and seeds when their loss is beneficial to the plant

Front 16

Autotroph

Back 16

An organism that is able to produce complex organic molecules from simpler molecules found in its environment, using an external energy source

Front 17

Critical day length

Back 17

A period of day length that when exceeded triggers flowering in long day plants or inhibits flowering in short day plants

Front 18

Cytokinin

Back 18

A group of hormones that promote cell division in plant roots and shoots, and the growth of buds

Front 19

Ethylene

Back 19

A plant hormone that promotes the ripening of fruit

Front 20

Gravitropism

Back 20

Growth towards (pos) or away from (neg) a gravitational attraction

Front 21

Gibberellins

Back 21

Plant hormones that regulate growth and influence various developmental processes including germination, dormancy and flowering

Front 22

Long day plant

Back 22

A plant that is triggered into flowering when nights become shorter than a critical length

Front 23

Nastic response

Back 23

A fast and reversible movement that is proportional to the intensity of the stimulus. Usually involves a change in turgor pressure

Front 24

Turgor pressure

Back 24

The force within the cell that pushes the plasma membrane against the cell wall

Front 25

Nyctinasty

Back 25

A circadian rhythmic movement of plants in response to the onset of darkness eg. The closing of the petals of a flower at dusk.

Front 26

Photoperiod

Back 26

The period of time each day during which an organism receives sunlight

Front 27

Photoperiodism

Back 27

The response of an organism to seasonal changes in the photoperiod

Front 28

Photosynthesis

Back 28

The process by which plants and some bacteria use the energy from sunlight to produce glucose from carbon dioxide and water

Front 29

Phytochrome

Back 29

A blue-green pigment found in many plants that regulates various developmental processes, particularly flowering

Front 30

Phytohormone

Back 30

Any of a range of chemicals that regulate plant growth

Front 31

Short day plant

Back 31

A plant that is triggered into flowering when nights become longer then a critical length

Front 32

Thigmonastic

Back 32

A nastic response triggered by touch