Explanation:
What is Seed Germination?
Seed germination may be defined as the fundamental process by which different plant species grow from a single seed into a plant. This process influences both crop yield and quality.
A common example of seed germination is the sprouting of a seedling from a seed of an angiosperm or gymnosperm.
Also, read: Formation and Dispersal of Seeds
The Process of Seed Germination
The complete process of seed germination is carried out in the following steps:
Process of Seed Germination
During the beginning stage of the germination, the seeds take up water rapidly and this results in swelling and softening of the seed coat at an optimum temperature. This stage is referred to as an Imbibition. It starts the growth process by activation of enzymes. The seed activates its internal physiology and starts to respire and produce proteins and metabolizes the stored food. This is a lag phase of the seed germination.
By rupturing of the seed coat, radicle emerges to form a primary root. The seed starts absorbing underground water. After the emerging of the radicle and the plumule, shoot starts growing upwards.
In the final stage of seed germination, the cell of the seeds become metabolically active, elongate and divide to give rise to the seedling.
Also Read Parts of a Seed.
Conditions Necessary for Seed Germination
Here are some important requirements which are essential for a seed to germinate into a seedling and to a plant.
Water: It is extremely necessary for the germination of seeds. Some seeds are extremely dry and need to take a considerable amount of water, relative to the dry weight of the seed. Water plays an important role in seed germination. It helps by providing necessary hydration for the vital activities of protoplasm, provides dissolved oxygen for the growing embryo, softens the seed coats and increases the seed permeability. It also helps in the rupturing of seed and also converts the insoluble food into soluble form for its translocation to the embryo.
Oxygen: It is an important and essential source of energy required for seed growth. It is required by the germinating seed for the metabolism and is used as a part of aerobic respiration until it manages to grow green leaves of its own. Oxygen can be found in the pores of soil particles, but if the seed is buried too deep it will be deprived of this oxygen.
Temperature: For a seed to germinate, it requires a moderate temperature of around 25-30°C. Quite obviously different seeds require different optimum temperatures. There are some seeds which require special requirements either lower or higher temperature between 5 to 40°C.
Light or darkness: This can act as an environmental trigger. Many seeds do not germinate until sunlight falls on them.
The process of seed germination triggers under the above mentioned favourable conditions. The seeds undergo rapid expansion and growth of the embryo and subsequently rupturing the covering layers and emergence of the radicle. This radicle emergence is considered the completion of germination.
Explore more: Significance of Seeds and Fruits Formation
Factors Affecting Seed Germination
There are some major factors that affect seed germination. These include:
External Factors
Water: The poor or additional supply of water affects the seed germination.
Temperature: This affects the growth rate as well as the metabolism of the seed.
Oxygen: Germinating seeds respire vigorously and release the energy required for their growth. Therefore, deficiency of oxygen affects the seed germination.
In certain cases, a temperature below the moderate level slows down the seed germination and promotes fungal growth. In some cases, the germination stops at the temperature above the moderate level.
Internal Factors
Seed Dormancy
This is a condition in which the seeds are prevented from germinating even under favourable conditions.
During seed dormancy:
The seed coat, which is resistant to water and gases, restrict water-uptake and oxygen exchange.
The seeds with undeveloped or immature embryo do not germinate.
Certain seeds contain plant growth regulators, which inhibit seed germination.
Some seeds require more time for their germination.
To learn more about the seed, its parts, seed germination, its process, factors affecting seed germinations and any other related topics visit BYJU’S Biology
States are not permitted to pass laws that increase the minimum wage established by the federal government.
True
False
Which of the following does not describe technological advances?
•the development of a global culture
•the bringing of harmony to diverse groups of people
•a reduction of the number of people living in rural areas
•people's increased exposure to new ideas
Only one answer not multiple choice
what would you expect to find in a countryBrazilians from rural areas who come to Rio de Janeiro and São Paulo looking for a better life _____.
a) find jobs and housing
b) end up in poverty
c) have useful job skills
d) are able to buy apartments
Answer:
a) find jobs and housing
Explanation:
People who generally migrate from rural to urban areas are seeking better jobs and housing.
These group of people can be characterized by their drive to attain a better standard of living.
Rural areas offers little opportunity outside of agricultural practices. People from these rural communities have different skills and some are bereft of skills. They all one goal which is to find better jobs and housing.Answer:
end up in poverty is the answer
Explanation:
It is believed the that the Appalachian Mountains used to reach heights of nearly 20,000 feet. Over the last 300 million years since the mountains were formed, there has been enough erosion to flatten the mountains. However, despite all of the erosion, Virginia still has its mountain ranges. Which is NOT a major cause of the erosion of the mountains? A)water run-off B)wind C)coal mining D)rain
Answer:
Coal mining is not a major reason for the erosion of the Appalachian Mountains.
Explanation:
The Appalachian Mountains are one of the oldest mountain chains in the world. They have formed over 300 million years ago, being one of the highest, if not the highest mountains in the world in their prime. As we can see nowadays though, these mountains are not anywhere near to being the highest, but instead have a medium and small height, depending on which part of them.
The reason that these mountains lost much of their elevation is the erosion. 300 million years is a very long time, and constantly being affected by erosion has led to gradual losing of rock layers, flattening, and having gentle slopes. The rainfall, water run-off, wind, high and low temperatures, ice, have all had their impact on the erosion of the Appalachians. Over time, in a few million years, what will be left of this mountain range would be smaller and larger hills intersected with lowlands.
Answer:
C , coal mining
Explanation:
natural please leave a heart
Define grey water footprint
A. The amount of greenhouse gases
B. The amount of freshwater required to mix and dilute pollutants enough to maintain water quality
C. The amount of rainwater required (evaporated or used directly) to make a product
D. The amount of surface water and groundwater required (evaporated or used directly) to make a product
Answer: B. the amount of fresh water required to mix and dilute pollution in the water.
Explanation:
a grey water footprint is the volume of fresh water that has ben assimulated to pollutants baced on back ground concentration and compisision it also test ambiant water standards to see the quality of the water it has a certain standered that has to be exceded in order to pass as clean water the cleaner the better it is for the ecosystem the minerals and life need the freshest water to drink (no that just is for fresh water sorces) but it is also used for the acidity of the ocean it needs to stay a certain saltyness or the fish and aquatic life will have to relocate or they will just die.
Why is the solor system considered a natural system
Answer:
The solar system is considered a natural system because it was made and controlled by natural forces, meaning, it was never influenced with human creations. It is considered as one of the products of the phenomenon of the physical world. Hope this answer helps you.
The landform circled on the map above is the __________.
A.
Sahara
B.
Sahel
C.
Nile River Valley
D.
Atlas Mountains
Answer:
c
Explanation:
A monsoon is a winter cold spell.
Question 13 options:
True
False
Answer:
false
Explanation:
Answer:
false
Explanation:
Given right triangle GYK, what is the value of tan(G)?
One-half
StartFraction StartRoot 3 EndRoot Over 2 EndFraction
StartFraction 2 StartRoot 3 EndRoot Over 3 EndFraction
StartRoot 3 EndRoot
Answer:
B
Explanation:
Answer:
D. √3
Explanation:
hope i could help :) have a nice day
DESCRIBE the main provisions of the Endangered Species Act.
Answer:
Summary:
The Endangered Species Act ("ESA") prohibits importing, exporting, taking, possessing, selling, and transporting endangered and threatened species (with certain exceptions). ESA also provides for the designation of critical habitat and prohibits the destruction of that habitat. ESA provisions are enforced through the use of citizen suits, imprisonment, fines, and forfeiture.
Explanation:
is that all or do you need more?
All of the following statements about Polish immigrants in Texas are true EXCEPT
Answer:
You need to include the statements for an answer or i cannot provide one.
Explanation:
match the climate change term in column 1 to column
suns out put atmosphere traps heat
green house gases coldest phase of climate cycle
green house effect can vary
ice age atmosphere traps even more heat
Answer:
Sun's output - can vary
Greenhouse gases - atmosphere traps even more heat
Greenhouse effect - atmosphere traps heat
Ice age - coldest phase of the climate cycle
Explanation:
The Sun is a star, and it is constantly active. Its activity is very important when it comes to the living conditions on Earth because it can have a big climatic impact. In general, when the sun's output is higher, the Earth is warmer, when the sun's output is smaller, the Earth is colder.
Greenhouse gases are gases that have properties that enable them to trap heat. Such gases are carbon dioxide and methane. When these two gases are in a higher amount in the atmosphere, the atmosphere becomes increasingly warmer, leading to global warming.
The greenhouse effect occurs when there is a solid amount of greenhouse gases in the atmosphere. They manage to trap the heat, thus increase the temperature. By increasing the temperature in the atmosphere, the whole climate on Earth experiences changes.
Ice ages occur because of the motion cycles through which Earth goes through When all three are in place, Earth cools down. Not just that the global climate becomes cooler, but it is also much drier, while the ice caps extend significantly more toward the lower latitudes.
Plateaus dominate the landscape of Pakistan.
Question 18 options:
True
False
Answer:
Plateaus dominate the landscape of Pakistan. FALSE.
Explanation:
PLS HELP NOW ‼️‼️What is Europe's rank in size?
A. fourth largest continent
B. smallest continent
C. Second smallest continent
D. Second largest continent.
Answer:
B
Explanation:
Europe is the smallest continent
What is the process to break down rocks into smaller pieces?
Answer:
Weathering
Explanation:
when a rock has been weakened and broken up by weathering. Weathering is the breaking down of rocks, soils, and minerals as well as wood and artificial materials through contact with the Earth's atmosphere, water, and biological organisms. Weathering and erosion help shape Earth's surface.
( erosion is different from weathering and weathering is the answer you are looking for! I hope this helped. I looked into different areas to find more information about weathering)
:)
Answer:
weathering rocks
Explanation:
This is the process of dissolving rocks into smaller pieces.
The elements that help to weather rocks are water, salt, minerals, animals, wind.
It is a breakdown of rocks, watering-away, revealing the elements, which can happen with the help of nonliving and living factors as well.
Why was intelligence so important during the Cold War?
The US was concerned about the possibility of a nuclear attack.
The US wanted to find out how communism was spreading so fast.
The US wanted to know how the Soviet Union became a superpower.
The US was concerned about how the Soviet Union was treating its citizens.
THE ANSWER IS A
Answer:
The US wanted to find out how communism was spreading so fast
Explanation:
The US knew how the USSR had become a super power, and they didn't care how the citizens were being treated. The threat of a nuclear attack was on the minds of many, but the US's main goal during the Cold War was to prevent communism from spreading, so using intelligence agents to find out how it was spreading is the best answer.
Answer:
The answer is A!!
Explanation:
Got it right on edge 2021 :>
describe how humans have adapted to hot, dry climates
Answer:
humans can asimulate to any climate as long as it is not to extream we can asimulate to the hot air and we will sweat to keep cool and we will actualy start to concerve energy and start using any digested matirial and our bodys will slow down some proceses to conserve energy and water so we dont over heat thats why when it is hot out side u get tired more easly because u can over heat and wast energy and water through sweat and other proceses thats why they say to carry a lot of water and drink a lot of water and eat lots of healthy high energy food and refraim from drinking the hot weather and alcahole can combust or even kill you.
Explanation:
i need someone that knows not thinks to answer my questions pls i have tons so u get a lot of points
Answer:
Im sorry im to stupid to answer them, i whould help you if u could!
Explanation: