what is geotropism and photoperiodism? pls answer fast I will mark you brainlest
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Answer:
What is Geotropism?
If you put a plant on its side, you would notice that, after a while, the roots will start to grow downward as the stalk grows upwards. This reaction to gravity is called geotropism, or gravitropism.
The roots show good geotropism, or grow with gravity, while the stalk shows bad geotropism, or grow against gravity.
Different parts of the plant grow differently because they have different functions. The roots need to grow in the soil to provide plant stability, as well as access to water and nutrients. The stalk needs to grow upwards in the sun to allow the plant to soak, or to make food from the sun.
So, how do different parts of the plant know which way to grow? Plants have organelles called statoliths, which sit below their cells and allow plants to feel gravity. They also contain a hormone called auxin, which promotes growth and growth in plant cells. In root cells, statoliths and auxins cause growth at the bottom, while cells above the soil are signed to grow higher.
Photoperiodism, the functional or behavioral response of an object to changes in length daily, at certain times of the year, or through annual cycles of light and darkness. Photoperiodic reactions can be accurately predicted, but temperature, nutrition and other environmental factors also alter the immune response.
In animals, the normal functions of migration, reproduction, and changing coats or pipes can be performed out of season by deliberately changing the daytime sun. Birds, for example, have migrated north in the winter following exposure after restoration of seasonal light in laboratory areas. The illusion of a certain stimulating period of darkness, required by each species at all stages of the migration process, is an important element in Photoperiodism.
When stimulated by light, the starvation of the developing animal will release the hormones that affect the reproduction. Thus, the breeding season of the species can be performed at an abnormal time by daylighting. The longer periods of light followed by shorter periods will promote growth performance in breeds that are normally breeding in the fall (e.g., goats and sheep), while spring breeders (e.g., mink) will begin the breeding process at daylight. The use of photoperiodism is common in the poultry industry, as daytime affects egg laying, growth and body weight of birds.
Answer:
These non-photosynthesis-related responses allow plants to adjust to their environment and optimize growth. ... Phototropism is a directional response that allows plants to grow towards, or in some cases away from, a source of light. Photoperiodism is the regulation of physiology or development in response to day length.
Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. It occurs in plants and animals. Photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark periods.\
The definition of geotropism is the growth of a plant or immovable animal in response to the force of gravity. An example of geotropism is the roots of a plant growing down into the ground.
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