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相关概念视频

Light as Energy01:35

Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
C4 Pathway and CAM01:27

C4 Pathway and CAM

Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
Regulation of Transpiration by Stomata02:04

Regulation of Transpiration by Stomata

During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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PLAGIOTROPIC HABIT OF GROWTH IN NORWAY SPRUCE.

Science (New York, N.Y.)·1942
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ROOTING NORWAY SPRUCE CUTTINGS WITHOUT CHEMICAL TREATMENT.

Science (New York, N.Y.)·1939
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EFFECTS ON TREES OF AN ILLUMINATING GAS IN THE SOIL.

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METHYLENE BLUE AND GASSED PLANTS.

Science (New York, N.Y.)·1934
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CHEMICAL TREATMENTS TO SHORTEN THE REST PERIOD OF TREE SEEDS.

Science (New York, N.Y.)·1931
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CHEMICAL TREATMENT TO SHORTEN THE REST PERIOD OF SUGAR MAPLE TREES.

Science (New York, N.Y.)·1929

相关实验视频

Updated: Jul 10, 2026

A Venturi Effect Can Help Cure Our Trees
05:26

A Venturi Effect Can Help Cure Our Trees

Published on: October 1, 2013

照明气体对树木的刺激作用

C G Deuber

    Science (New York, N.Y.)
    |May 6, 1932
    PubMed
    概括

    No abstract available in PubMed .

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