Do substances that dissolve in water pass through the plasma membrane

Steps of Double Fertilization.

1. Germination of pollen on stigma :

(i) By absorbing secretion of stigma pollen swells up and outer layer exine ruptures whereas inner lintine comes out in the form of pollen tube.

(ii) Branched polen tube is formed in amentiferae group.

(iii) In families malvaceae, cucurbitaceae, etc. polysiphonous condition (many pollen tubes from a single pollen) is found.

2. Path taken up by pollen tube :

(i) Pollen tube pierces through stigmatic papilla into the tissue of style.

(ii) Filiform apparatus of synergids secrete some chemotropically active substances, which promotes porogamy.

(iii) Obturator (special structure) act as a bridge for growth of pollen tube.

(iv) Cations are naturally occurring chemotropic agents in the pistil.

3. Entry of pollen tube into embryo sac :

(i) It enters into the ovule by either of the two methods; porogamy, chalazogamy or mesogamy.

(ii) Irrespective of the mode of entry of pollen tube into the ovule, the pollen tube always enters into embryo sac at micropylar end (Porogany).

(iii) If enters through chalaza (base) it is termed chalazogany.

(iv) If pierces through integuments, it is called mesogamy.

(v) Tip of pollen tube penetrates embryo sac and reaches egg apparatus.

4. Syngamy (Generative fertilization)

(i) Pollen tube burst as tube nucleus disorganises.

(ii) One of male gametes fuses with egg cell or oosphere.

(iii) Deploid oospore or zygote is formed.

5. Triple fusion (Vegetative fertilization) :

The other gamete fuses with secondary nucleus forming triploid primary endosperm (PEN) which later give rise to endosperm.

Answer:

Double fertilization is a process unique to flowering plants (angiosperms) in which two sperm cells fertilize two different structures within the female reproductive system. The steps of double fertilization are:

Double fertilization leads to the formation of both the embryo and endosperm within the ovule, which ultimately results in the development of a seed.

Answer:

Like a prokaryotic cell, a eukaryotic cell has a plasma membrane, cytoplasm, and ribosomes, but a eukaryotic cell is typically larger than a prokaryotic cell, has a true nucleus (meaning its DNA is surrounded by a membrane), and has other membrane-bound organelles that allow for compartmentalization of functions

Answer + Explanation:

Moose numbers boomed during the wolf drop-off but have plunged since. Predation accounted for nearly 9 percent of deaths over the past year. Other factors were blood-sucking tick infestations and malnutrition caused by a shortage of balsam fir, the moose's primary winter food source.

The advantage that rabbits with floppy ears have over rabbits with straight ears is not entirely clear, and there are different hypotheses that attempt to explain this trait.

What is Floppy Ears?

Floppy ears refer to ears that hang down rather than standing upright. This trait is commonly observed in some dog breeds, such as Basset Hounds, and in rabbits, such as the lop-eared breed.

In rabbits, the floppy ear trait is caused by a genetic mutation that affects the development of cartilage in the ear. Normally, the ear cartilage is strong enough to support the weight of the ear and keep it standing upright. However, in rabbits with the mutation, the cartilage is weaker and less able to support the weight of the ear, causing it to flop down.

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Populations in Hardy-Weinberg equilibrium express the same allelic and genotypic frequencies through generations. Number of individuals expressing each phenotype: 63 sheep S^AS^A, 84 sheep S^AS^B, 28 sheep S^BS^B.

The Hardy-Weinberg equilibrium theory states that allelic and genotypic frequencies in populations that is in equilibrium remain the same through generations. No evolutive forces are acting on these populations, so no evolution occurs.

Assuming a diallelic gene,

Allelic frequencies

Genotypic frequencies

The addition of the allelic frequencies equals 1

p + q = 1.

The sum of genotypic frequencies equals 1

p² + 2pq + q² = 1

In the exposed example,

Alleles          Frequencies

Genotypes

We need to get the number of animals expressing each genotype and phenotype. To do it, we just need to use allelic frequencies and calculate  genotypic frequencies (p², 2pq, and q²), and then multiply these values by the total number of animals (N = 175).

Genotypic and Phenotypic frequencies

F(S^AS^A) = p² = 0.6² = 0.36

F(S^AS^B) = 2pq = 2 x 0.6 x 0.4 = 0.48

F(S^BS^B) = q² = 0.4² = 0.16

Number of individuals expressing each phenotype

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Complete question

A single gene with two alleles control variation in haemoglobin type in sheep. There are three different phenotypes corresponding to genotypes

In a flock of 175 sheep the frequency of allele S^A was found to be 0.6 and frequency of allele S^B WAS found to be 0.4.

Using the hardy weinberg equation calculate the number of sheep with each phenotypes in the flock show your working

Answer:

No image of the cell has been provided.

Explanation:

Answer:

Label A

✔ Vacuole

Label B

✔ Cell wall

Label C

✔ Chloroplast

Label D

✔ Mitochondrion

Explanation: this is right on endgenuity, i just completed this question.....hope this helps! (but keep in mind our picture may be labled different so im sry in advance)

A.)Lysosomes and B.) extracellular space. Glycolysis marks the beginning of cellular respiration.

It doesn't need oxygen and doesn't happen in the mitochondrion; instead, it happens in the cytosol of the cytoplasm. Beginning with the formation of citrate, an oxaloacetate molecule receives an acetyl group with two carbons from acetyl CoA. Since this reaction initiates the citric acid cycle, oxaloacetate is necessary for the cycle to proceed. The body uses anabolism to create complex molecules by using the energy produced by catabolism. Cellular structures are created from small, basic precursors, which serve as the building blocks, using these complex molecules as the final product.

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Explanation:

c. high winds. is the answer

Answer:

b. lightning bolts

Explanation:

Answer:

The conversion of Pfr to Pr.

Explanation:

If the seeds germinates properly  when the surface is in full sun and persist to germinate when buried deep into the soil, this shows that this lineage of seeds  has a mutation that inhibits the conversion of Pfr to Pr

Answer:

Because it helps us by different ways.Like forests helps us by taking carbon dioxide and by throwing out Oxygen. Water helps us in different types of household works like cooking,bathing, e.t.c

Answer:

mostly natural things are the base for our man made stuff..so without natural things no made made things would exist

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Answer:

Errors in the human genetic code, which are called mutations, sometimes lead to the production of abnormal proteins that may cause disease, including autoimmune disease and malignancy.A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block (base pair) to a large segment of a chromosome that includes multiple genes.

Explanation:

White blood cells are part of the body's immune system. They help the body fight infection and other diseases and Red blood cells are responsible for transporting oxygen from your lungs to your body's tissues. Your tissues produce energy with the oxygen and release a waste, identified as carbon dioxide. Your red blood cells take the carbon dioxide waste to your lungs for you to exhale.

Answer:

White blood cells helps the body fight infection and other diseases.

Red blood cells helps in transporting oxygen from your lungs to your body's tissues. 

have a nice day <3

The two species are mutualistic in nature. The two species exhibit commensalism.

Answer:

Glaciers cause erosion by plucking and abrasion. Valley glaciers form several unique features through erosion, including cirques, arêtes, and horns. Glaciers deposit their sediment when they melt. Landforms deposited by glaciers include drumlins, kettle lakes, and eskers.

Explanation:

Glaciers cause erosion by plucking and abrasion. Valley glaciers form several unique features through erosion, including cirques, arêtes, and horns. Glaciers deposit their sediment when they melt. Landforms deposited by glaciers include drumlins, kettle lakes, and eskers.

Answer:

TAGG

Explanation:

Adenine always pairs with thymine and cytosine always pairs with guanine

Answer:

Can you show the options

Answer:

we need options

Explanation:

but if there is no option also I guess because there is no fertile soil?

Answer:

Dominant, recessive, heterozygotes.

Explanation:

A heterozygote (heterozygous), individual has one dominant and one recessive allele. So to fill out this answer you have to remember that information.

The dominant trait is always shown over the recessive.

Hope this is correct, have a great day!

Answer:

cellular respiration and photosynthesis work together by taking in energy such as the sun, or Co2 to convert that into energy and oxygen right back into the atmosphere.

Explanation:

The process of Photosynthesis and cellular respiration work in tandem because the reactants of photosynthesis are the products of cellular respiration while the reactants of cellular respiration are the products of photosynthesis.

Photosynthesis may be defined as the process through which green plants and some photosynthetic algae synthesize their own food in the form of glucose with the help of carbon dioxide and water in the presence of sunlight.

The complete reaction of photosynthesis is as follows:

With the help of this reaction, it is clear that carbon dioxide and water are the reactants of photosynthesis, while cellular respiration is a chemical process in which oxygen is used to make energy from carbohydrates (sugars) and derives energy along with carbon dioxide.

Therefore, the process of Photosynthesis and cellular respiration work in tandem.

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Answer:

I think b is the right answer

Answer:

^^ The answer is below ^^

Explanation:

Water vapor is water in the gaseous phase. Meteorologists have defined several different terms to express the amount of water vapor in air. ... Specific humidity is the ratio of the mass of water vapor in a sample to the total mass of the moist air, including both the dry air and the water vapor.

Meteorologists refer to the water vapour in the atmosphere as moisture or humidity.

The atmosphere is continually being circulated with water. Water evaporating from the surface of the Earth rises into the sky on heated updrafts. When the air is driven by the wind, it condenses into clouds before returning to Earth as rain or snow. This cycle is vital to how heat and energy are moved around our globe from one location to another and from the Earth's surface to the atmosphere.

The most significant greenhouse gas found in the atmosphere is also water vapour. The heat emitted from the surface of the Earth is absorbed by water vapour molecules in the lower atmosphere. In turn, the molecules of water vapour emit heat in all dimensions. The Earth's surface receives some of the heat back. So, in addition to sunshine, water vapour serves as a second source of warming for the Earth's surface.

Therefore, meteorologists refer to the water vapour in the atmosphere as moisture or humidity.

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Explanation:

The rough ER, studded with millions of membrane bound ribosomes, is involved with the production, folding, quality control and despatch of some proteins. Smooth ER is largely associated with lipid (fat) manufacture and metabolism and steroid production hormone production. It also has a detoxification function.

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Answer:

C. Mudflow

Explanation:

The land contains approximately 60% of water in a mudflow.

:D

Answer:

Mudflow

Explanation:

I got mudflow correct on edge its not landslide

Vector-borne diseases are human illnesses caused by parasites, viruses and bacteria that are transmitted by vectors.

Infections known as vector-borne illnesses are those that are spread by the bite of an infected species of arthropod, including mosquitoes, ticks, triatomine bugs, sandflies, and blackflies. Being cold-blooded (ectothermic), arthropod vectors are particularly susceptible to climate influences. Mosquitoes can transmit the Zika virus, West Nile virus, Chikungunya virus, dengue, and malaria to humans. Direct touch, droplets, a vector like a mosquito, a vehicle like food, or the airborne route are all possible modes of transmission.The tick is the most prevalent vector. Mosquitoes are the most prevalent and are the primary carriers of many dangerous illnesses.

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The Devil's Hole pupfish has evolved a behavior described as "paradoxical anaerobism" as a result of adapting to a lack of oxygen in its habitat.

The correct answer is: A.

HABITAT: Having evolved to live within dry regions, deserts pupfish are capable of withstand conditions such as daily temperature changes of up to forty-five degrees Celsius, water temperatures around 120 degrees Celsius, extremely low concentrations of oxygen, salinity levels over twice as much of the ocean, and water temperatures above 110 degrees Fahrenheit.

Warm, salinized waters or salt streams are where they live, which would quickly kill a trout. For example, a Salt Creek pupfish can survive in seawater that is three times as salty. In Monument Valley National Park, they are plainly visible from a boardwalk.

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Answer:

postive its "C"

Explanation:

The third trophic level is made up of prairie dogs that get their matter and energy from the grasses (option d).

The energy pyramid depicted in the image illustrates the flow of energy through an ecosystem. In an energy pyramid, each level represents a trophic level, indicating the position of organisms in a food chain. The pyramid narrows as it ascends, indicating the decrease in available energy at higher trophic levels.

In this specific pyramid, the lowest trophic level is occupied by the grass. This makes sense because grass is a producer that captures energy from the sun through photosynthesis. As a result, it possesses the most energy within the ecosystem.

Moving up the pyramid, the second trophic level is occupied by the prairie dogs. They are herbivores that primarily consume grass for their energy needs. This demonstrates that the prairie dogs acquire their matter and energy from the grasses, supporting option D.

The third trophic level contains the coyotes, which are tertiary consumers. Tertiary consumers feed on other consumers, not producers. Therefore, option A is incorrect since vultures, not coyotes, are tertiary consumers in this ecosystem.

Option B is also incorrect because the coyotes do not obtain their energy from other coyotes located in the third trophic level. They acquire their energy indirectly from the grasses through the prairie dogs.

Finally, option C is incorrect as it states that the grasses' trophic level has the most energy. While the grasses are indeed the primary producers and possess the most energy, not all of that energy moves to the second trophic level.

Thus, the correct statement supported by the ecological pyramid is option D: The third trophic level is made up of prairie dogs that get their matter and energy from the grasses.

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The two factors are concentration, charge, and size all affect its capacity to traverse a membrane.

Molecules often diffuse through membranes from high concentration areas to low concentration areas. Charged molecules cannot enter a cell across the membrane unless the cell is electrically charged.

A semipermeable or selectively permeable membrane's ability to transport a molecule or molecules depends on:

1. The size of the transported molecule or molecules

2. The molecule(s)' solubility in lipids

The lipid solubility of the chemical to be carried across the membrane is a crucial consideration because phospholipid bilayers make up cell membranes in biological systems.

Ion-gated channels of the cell membrane, which open and close in response to the ion concentration and charge of the molecule as well as the charge inside the cell (in cytoplasm or cytosol), are used to transport some molecules.

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