Science 4.1

Tropisms, Dichotomous Key, Stimulus, Plants and Forces


there are 4 different tropisms 1. geotrpism 2. phototropism 3. thigmotropism

4. hydrotropism

Geotropism: the stem and roots of the plants have different reactions to gravity the stem has a negative reaction and grows away from gravity while the roots have a positive reaction and grow to gravity.

Phototropism: a photo tropism in general is sunlight but that's not all it is when plants grow to sunlight for example if you put a box over a plant with a maze inside and a hole at the top the plant would grow around the maze and eventually out the hole.

Thigmotropism: a thigmotropism is where the plant is using a structure to grow on such as vines the grow on almost anything fences, other plants, homes, buildings, ect.

Hydrotropism: a hydrotropism is when plants are close to water and their roots will grow to the water in order to sustain homeostasis/ or photosynthesis.

Dichotomous Key Flowers

1. a if the flower has a big yellow middle go to 2

b if the flower has big pedals go to 3

2. a if the flower has white pedals it is a daisy

b if it has no pedals it is a dandelion

3. a if it is red-pink go to 4

b if it has blue heart shaped pedals it is a petunia

4. a if its stem is spiky it is a rose

b if it has no spikes it it a turnip

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A= Daisy

B= Dandelion

C= Petunia

D= Rose

E= Turnip


Stimulus: A thing that rouses activity or energy in someone or something, a spur or incentive.

Response: a reaction to something.

you ingest poison and vomit Stimulus: poison Response: vomit

Plants and forces

plants need water that is clean to sustain a high turgor pressure to be able to stand/force upright.

plants Force/ wedge there roots to stay in the ground and keep the soil strong.

Other producer information

plants are important because if we didn't have them we wouldn't be able to breath and we would all die of suffocation.

we eat plants almost everyday, some of them are spinach, cilantro, turnips, onions, celery, ect.

plant cell's differ from other cells they have two different key elements chloroplasts, and the cell wall.