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What is the most important source of water on Earth?


Where is the majority of Earth’s water found?


What is Earth’s biggest source of fresh water?

What are the source of fresh water?

On the landscape, freshwater is stored in rivers, lakes, reservoirs, and creeks and streams. Most of the water people use everyday comes from these sources of water on the land surface. Lakes are valuable natural resources, both for human and non-human life.

What is Earth’s biggest source of light?


What is Earth’s source of light?

the sun

What are 5 sources of light?

Examples of natural sources of light

  • Sun.
  • Stars.
  • Lightning.
  • Fireflies.
  • Glowworms.
  • Jellyfish.
  • Angler fish.
  • Viperfish.

Is light man made?

Artificial light is created by humans. Flashlights, table lamps, neon signs, and televisions are some sources of artificial light.

What does man-made light mean?

Artificial light, as opposed to natural light, refers to any light source that is produced by electrical means. Artificial lighting has many different applications and is used both in-home and commercially.

Which light source is natural and which is man-made?

A light source is anything that makes light, whether natural and artificial. Natural light sources include the Sun and stars. Artificial light sources include lamp posts and televisions.

What is the first man made source of light?

Since the discovery of fire, people have strived to create better and brighter light sources. The origin of artificial light goes all the way back to 500 BC, when bamboo pipes carried natural gas from volcanoes to light the streets of ancient China.

What are the 3 types of lighting?

3 Basic Types of Lighting

  • Ambient lighting.
  • Task lighting.
  • Accent lighting.

Can artificial light grow plants?

Researchers can successfully grow plants using only artificial light in growth chambers. But sunlight is best for most plants. And there’s another difference between lamps – even “grow lamps” – and sunlight. Grow lamps need energy to light up.

What kind of artificial light do plants need?

There are four primary sources of artificial light available for the enhancement of plant growth: incandescent; fluorescent; high-intensity, or gas, discharge; and light-emitting diodes. As a single light source for plants, incandescent lights are not particularly good.

Do plants like music?

Plants thrive when they listen to music that sits between 115Hz and 250Hz, as the vibrations emitted by such music emulate similar sounds in nature. Plants don’t like being exposed to music more than one to three hours per day. Jazz and classical music seems to be the music of choice for ultimate plant stimulation.

Do plants grow better in sunlight or artificial light?

Generally, sunlight is best for plant growth, since artificial lights cannot replicate the specific colors of light (wavelengths) that are optimal for plants. However, artificial lights can work well to supplement sunlight, especially during winter or where sufficient sunlight is unavailable.

Can I use a grow light instead of Sun?

You can almost equal the quality of sunlight with grow lights if you only use full-spectrum bulbs. Plants that aren’t getting enough light will suffer ill effects. Plants may pale or turn yellow or white. Leaves may drop and the plant will grow less foliage and fail to flower.

What can replace sunlight?

Types of Artificial Lights

  • Fluorescent lights are by far the most economical and easy choice for houseplants.
  • Incandescent lights give off a lot of heat and should be placed farther away from plant foliage.
  • LED lights are also a low heat, energy-efficient artificial light source.

Which plant part is responsible for absorbing water?

Plants absorb water through their entire surface – roots, stems and leaves. However, the majority of water is absorbed by root hairs. Root hairs are thin-walled uni-cellular outgrowths of epidermis. They are in close contact with the thin film of water surrounding the soil particles.

How does a plant get carbon dioxide?

Plants get the carbon dioxide they need from the air through their leaves. It moves by diffusion through small holes in the underside of the leaf called stomata .

How quickly do plants absorb water?

Plants absorb water most rapidly during the day, so more is absorbed by the roots, instead of being lost into the soil.

Which is the first plant hormone?

hormone auxin

What is the most important plant hormone?

Gibberellins, being one of the most important and primary plant hormones, have physiological functions such as stimulating organ growth through enhancement of cell elongation and cell division; they also act as a developmental switch between seed dormancy and germination, juvenile and adult growth phases, and …

Where is cytokinin found?

Cytokinins are present in all plant tissues. They are abundant in the root tip, the shoot apex and immature seeds. Their endogenous concentration is in the low nM range.

Which gibberellin is discovered first?

So, the correct answer is ‘GA1’.

Who named gibberellin?

The term “gibberellin” was first used in 1935 by Teijiro Yabuta for this active substance, from which two crystalline solids, named gibberellin A and gibberellin B, were eventually obtained.

Where does gibberellin come from?

Gibberellin, any of a group of plant hormones that occur in seeds, young leaves, and roots. The name is derived from Gibberella fujikuroi, a hormone-producing fungus in the phylum Ascomycota that causes excessive growth and poor yield in rice plants.

Where is gibberellin produced?


How is gibberellin produced?

Gibberellins are produced in greater mass when the plant is exposed to cold temperatures. They stimulate cell elongation, breaking and budding, seedless fruits, and seed germination. Gibberellins cause seed germination by breaking the seed’s dormancy and acting as a chemical messenger.