What are types of tropisms in animals?

Answer 1

Tropisms are the growth responses of plants where the plant grows towards or away from the stimulus. Growth towards the stimulus is a positive topism. Growth away from the stimulus is called a negative tropism.

There are three main tropisms:

1) The response to light is called phototropism.

2) The response to gravity is called gravitropism (or sometimes geotropism).

3) The third tropic response to heat is thigmotropism

Answer 2

The tropisms can go into two directions:

A positive response is when the plant moves toward or in the direction of the stimulus. A negative response is when a plant moves away from the stimulus.

Phototropism: plant stems grow towards light ( positive ), important for photosynthesis.

Photoperiodism: response of a sunflower f.e. to naturally occurring changes in light during a 24-hour period and to have always best wavelength to photosynthesize ( positive )

Gravitropism/geotropism: a plant will grow so that it stays oriented relative to the source of gravity (the earth).If a plant is knocked down the shoot will grow faster on the lower side until the shoot is more-or-less standing up again ( negatively to gravity by growing up toward the sky ).

The root grows down into soil ( direction of gravity > positive ); that`s important for stability and uptaking nutrients.

Hydrotropism: plant grows or bends in response to water, roots grow down in search of water ( positive ). Every plant needs water to transport nutrients and to photosynthesize.

Thigmotropism: plants ( fungi, bacteria ) grow or bend in response to touch.

http://cat.inist.fr/?aModele=afficheN&cp...

When mistletoe-seeds geminate, a root-like structure, called a radicle, emerges from the germinated seed and grows along the branch surface by a process known as thigmotropism.

http://www.apsnet.org/online/feature/mis...

Answer 3

gravitropism-growth towards the ground/following gravity

phototropism-growth towards the light

hydrotropism-growth towards water, soil(nutrients e.t.c)

thermotropism-growth towards heat

See related link bellow

Answer 4

A growth movement of a plant part in response to an external stimulus in which the direction of stimulus determines the direction of response is called tropism. Types of tropism : a) Phototropism b) Geotropism c) Chemotropism d) Hydrotropism e) Thigmotropism

Answer 5

Tropism, response or orientation of a plant or certain lower animals to a stimulus that acts with greater intensity from one direction than another. It may be achieved by active movement or by structural alteration. Forms of tropism include phototropism (response to light), geotropism (response to gravity), chemotropism (response to particular substances), hydrotropism (response to water), thigmotropism (response to mechanical stimulation), traumatotropism (response to wound lesion), and galvanotropism, or electrotropism (response to electric current). Most tropic movements are orthotropic; i.e., they are directed toward the source of the stimulus. Plagiotropic movements are oblique to the direction of stimulus. Diatropic movements are at right angles to the direction of stimulus.

Answer 6

The types of tropism are Positive/Negative Tropism, Phototropism, Gravitropism(geotropism), and Thigmotropism.

Answer 7

There are several types of animal tropism, including cytotropism, electrotropism, rheotropism, and anemotropism. There is also chemotropism, thigmotropism, and neurotropism.

Answer 8

Heat, light and gravity

Answer 9

Geotropism,Phototropism and Hydrotropism