Based on your knowledge of reproduction in bryophytes and ferns, is the presence of flagellated sperm in cycads surprising? Why or why not?

Answers

Answer 1

Answer:

The correct answer is - All plants share a similar life cycle

Explanation:

The sperms that the bryophytes are biflagellated whereas in ferns these are multi-flagellated that helps in the swimming to the archegonia or female part to perform the fertilization, due to the presence of water.

The sperms in cycads also have flagella for the same purpose of swimming in the pollen tube. The ferns and the bryophytes both require the same or similar life cycle that includes the flagella and water for the formation of the zygote.


Related Questions

Conservation of mass the mass of a whole object

Answers

Answer:

Explore the Law of Conservation of Mass by demonstrating that the mass of a whole object is always the same as the sum of the masses of its parts. All objects and substances in the world are made of matter. ... Matter has two fundamental properties: matter takes up space and matter has mass.

Explanation:

What is the optimal pH for Enzyme B?

Answers

Answer:

6,7.77.0

Please correct Ok ?

Which statements best describe shared characteristics? Select two options.
A. Shared characteristics always exist in the common ancestor and in the modern organism.
B. Shared characteristics never exist in the common ancestor or in the modern organism.
C. The more characteristics organisms share, the more closely related they are.
D. The fewer characteristics organisms share, the more closely related they are.
E. Shared characteristics can exist among organisms that belong to different species. F. Shared characteristics only exist among organisms that belong to the same species.

Answers

Answer:

The more characteristics organisms share, the more closely related they are.

Shared characteristics can exist among organisms that belong to different species

Explanation:

A shared character can be regarded as a character that is shared by two lineages.

The statements that best describe shared characteristics

The more characteristics organisms share, the more closely related they are.Shared characteristics can exist among organisms that belong to different species.

The classification of all living entities is based on extremely basic, universal  traits.

Each group's organisms are subsequently subdivided into smaller groupings.

Each bigger group is divided into smaller groups based on more detailed similar shared characteristics.

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Difference between "Releasing" and "Inhibiting" hormones?

Answers

Answer:

Releasing hormones cause downstream release of a hormone and Inhibiting hormones does the opposite.

Hope this helps you!



What is exocytosis?

The process by which a cell engulfs a large particle or another cell, eating it

Pressure that a fluid exerts against a structure that contains it

The process by which a cell takes in a small amount of extracellular fluid and its contents by the ballooning inward of the plasma membrane

The process by which a cell expels the contents of an internal vesicle to the extracellular fluid

Answers

Exocytosis is a process by which the contents of a cell vacuole are related to the exterior through fusion of the value membrane with the cell membrane.
The answer is D - the process by which a cell expels the contents of an internal vesicles to the extracellular fluid.

A depiction of the MAPK/ERK signaling pathway that leads to cell growth is shown in the image.

What would be observed if a carcinogenic compound in coal tar activated step 3 of the pathway, even in the absence of the signaling molecule?

A) The transduction molecules in step 5 would always be active.
B) Step 2, the step linking the receptor to transduction, would always be active.
C) Step 4, a transduction step, would be prevented from activating the target protein.
D) The transcription factor in step 6 would be prevented from transcribing the target genes.

Answers

the correct answer is D

Answer:

a

Explanation:

I am pretty sure its a

One of the key elements in creating a green economy is the construction of ________________.
a.
green buildings
c.
solar panels
b.
a new tax system
d.
a new workforce

Answers

Answer:

A One of the key elements in creating a green economy is the construction of green buildings.  

Explanation:

Any economy relies on businesses and buildings, so a green economy is going to need green buildings to support a green economy as well.

Which two pieces of equipment did the geologist most likely use to determine the density of the copper nuggets?

Answers

A glass flask and sodium and hydrogen hope it helped

Explain one way the water cyce affects weather.

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Answer:Consequently, the temperature will fall. Rainfall and snow are results of water cycle and can lead to severe weather conditions. Excessive rainfall due to water cycle can cause floods. Extremely low rainfall, lack of adequate water sources can lead to draught in a given region.

Explanation:

PLEASE HELP ME WITH THIS QUESTION

Answers

Coarse I’m like 92% sure

a metacentric chromosome is one that has a centrally located centomere and chromosome arms with approximately equal length. which of the human chromosomesare metacentric

Answers

Answer:

Human chromosomes 1 and 3

Explanation:

There are four types of chromosomes classified based on the position of their centromere. These chromosomes are metacentric, submetacentric, acrocentric and telocentric. As rightly stated in this question, metacentric chromosome is the chromosome that has a centrally located centomere making the chromosome arms to be approximately of equal length.

The metacentric type of chromosomes are present in humans as viewed using KARYOTYPE (a pictorial display of chromosome arrangement). Based on karyotyping, chromosomes 1 and 3 are METACENTRIC.

the diagram below is a model that shows structural organization within a multicellular organisms. why is "tissue" listed between cell and organ?​

Answers

Because an organ is made up of several types of tissues, therefore several types of cells due to the fact that tissues are a group of cells of the same type that perform a specific function in an organism.

how animals in the taiga have adapted to survive the extreme cold of winter.
I

Answers

Answer:

Some animals have adapted to life in the taiga by hibernating when temperatures drop. Other animals have adapted to the extreme cold temperatures by producing a layer of insulating feathers or fur to protect them from the cold. In some instances, the adaptation of a seasonal change in color of feathers or fur protects the animal from its predators.

Answer:

Some animals have adapted to life in the taiga by hibernating when temperatures drop. Other animals have adapted to the extreme cold temperatures by producing a layer of insulating feathers or fur to protect them from the cold. In some instances, the adaptation of a seasonal change in color of feathers or fur protects the animal from its predators.

Explanation:

Which organelle makes energy for the animal cell?
A. mitochondria
B. chloroplasts
C. chromatin
D. golgi apparatus

Answers

The answer for that question is A

Answer:

A. mitochondria

Explanation:

The mitochondria makes energy for the animal cell. The mitochondria organelle is known as the "power house of all cells". It makes energy for the cell.

Hope this helped! If so, plz mark brainliest!

How can we conserve energy and instead of wasting energy?

Answers

Answer:

Adjust your day-to-day behaviors.

Replace your light bulbs.

Use smart power strips.

Install a programmable or smart thermostat.

Purchase energy efficient appliances.

In facilitated diffusion, do molecules move down their concentration gradient? Explain.

Answers

Answer:

Molecules move up the concentration gradient in facilitated diffusion, which requires ATP to be used as molecules naturally move from high to low concentration

Explanation:

: )

Molecules move down their concentration gradient in facilitated diffusion through channels of proteins.

For most molecules, movement through the membrane, with a significant rate, is only possible by the presence of transporter proteins (integral membrane proteins, which recognize substances with a high specificity, accelerating their translocation) or channels of proteins.

Transport proteins allow the facilitated diffusion of molecules, moving them along the free energy gradient (concentration gradient, charge gradient, or both), in the direction of thermodynamic equilibrium.

When a carrier protein binds to a solute, the protein changes shape in such a way that it carries the solute to the other side of the membrane.

Facilitated diffusion is similar to simple diffusion, since the molecules move from a region of higher to a lower concentration of solutes.

For example, by facilitated diffusion, chlorine ions move down their concentration gradient into the cell through chlorine channels.

Therefore, we can conclude that many molecules are assisted by transporter proteins for their diffusion through the plasma membrane, a process known as facilitated diffusion, where the molecules descend through their concentration gradient.

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Which fossils provide information as to the mode of formation of an oxygen-rich atmosphere by about 2 billion years ago?

Answers

Answer:

The fossils that provide information on the formation of an oxygen-rich atmosphere are the stromatilites from the Precambrian era. These are layered and columnar fossils consisting mainly of cyanobacteria which were the original life form back then. These bacteria took in carbon dioxide and produced oxygen by photosynthesis as early as 2.5 billion years ago (the earth is about 4.5 billion yrs old).

Explanation:

Which is greater 1,000 ml or 1,000 cm?

Answers

Answer:

Neither, they are equal.

1,000 cm3 = 1000 mL

2. Running water can be used as an energy
source to produce _____
power.

Answers

running water can be used as an energy source to produce hydroelectric power.

NEED HELP RLLY BAD
where are excessive ketones normally seen in a test?
1. blood
2. urine
3. saliva

Answers

I’m pretty sure it’s in normally seen in urine from what I remember or could be blood but its not saliva

Which statement is evidence that the components of the genetic code are common to all organisms?

A. All animals have the same four nitrogenous bases in common with each other.

B. All eukaryotes have the same four nitrogenous bases in common with each other.

C. All living organisms have the same four nitrogenous bases in common with each other.

D. All prokaryotes have the same four nitrogenous bases in common with each other.

Answers

Answer:

C. All living organisms have the same four nitrogenous bases in common with each other.

Explanation:

Because all living organisms have the same 4 nitrogenous bases in common with each other but different sequences.

can somebody do 4 and 5 for me

Answers

Answer:

4. According to what is observed in the diagram, the maltose (substrate) binds to the maltase (enzyme) to obtain glucose molecules (product), in a process of hydrolysis of the maltose.

5. Three factors that can affect intestinal maltose activity - slowing it down or stopping it - are temperature, pH and substrate depletion.

Explanation:

4. Enzymes, such as maltase, have the function of making a reaction faster and decreasing the activation energy. Maltase is responsible for breaking down a maltose molecule, a dimer, into two glucose monomers, which is a hydrolysis reaction of the bonds that hold glucose molecules together.

5. There are several factors that can cause the decrease or cessation of the activity of an enzyme. Enzymes are activated when substrate is available and work best under ideal temperature and pH conditions. When there are alterations of these factors, the enzyme will reduce or stop the reaction in which it intervenes.

pH: when the pH increases or decreases it produces a decrease in the speed of reaction that catalyzes an enzyme. Very high or low pH levels can denature the enzyme and make the expected reaction not occur. Temperature: like pH, changes in temperature can slow or stop maltase activity. Substrate availability: It is a fact that when the specific substrate of an enzyme becomes depleted, the rate of reaction slows down, stopping when no substrate is available.

4. Which part of the plant do we eat:
a. Cucumber:
b. Olive:
C. Broccoli:
d. Lettuce:

Answers

Stem stem stem stem stem

if a nutrient were in short supply in an ecosystem, how might it effect an organism

Answers

Answer:

Its leads to a deficiency

Explanation:

If a nutrient is in short supply in an ecosystem, it will lead to a deficiency of such nutrient in organisms that are in need of the nutrient.

Such a deficiency can lead to diseases in the ecosystem. If organisms that requires the nutrient cannot find an alternative, it will seriously affect their well being. Such deficiency often lead to very dire consequences for the balance of the ecosystem at large.

I need help can someone help me please?

Answers

Answer:

The answer is A

Explanation:

please help me with this question:)

Answers

Answer:

all cells so the last one

What effect does development, through erecting buildings and concrete pavement, have on the recharge of aquifers and the quality of the water?

Answers

Answer:

Infiltrate rate decreases and also water quality.

Explanation:

There is adverse effect of erecting buildings and concrete pavement on the recharge of aquifers and the quality of the water because the water is unable to infiltrate inside the soil due to concrete floor and the recharging of aquifers is not possible. These buildings and concrete pavements also reduces the quality of water due to degradation of sediments present in the building with the passage of time.

Red blood cells are able to maintain homeostasis because they are bathed in blood, which is to the fluid in the cells themselves.

Answers

Answer:

this is not a question it is a statement

Explanation:

pls helppppoooopppppoppppp

Answers

Answer:

direct observation

Explanation:

Describe the role of a nebula in the life cycle of a star. Please use your own words​

Answers

Answer:Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. The exact lifetime of a star depends very much on its size.

A star can be defined as a giant celestial (astronomical) object that is made up of a luminous sphere of plasma bounded together by its own gravitational force.

Generally, a star consists of two (2) main interstellar hot gas and these are:  

I. Hydrogen (H).

II. Helium (He).

Some of the examples of a star are;  

Sun (the closest to planet Earth). Antares. Canopus. Vega. Betelgeus.

A nebula simply refers to a low-density cloud of interstellar hot gas (hydrogen and helium) and dust.

Basically, a nebula is needed for the creation or formation of a star.

Hence, the role of a nebula in the life cycle of a star include the following:

Stage 1: The temperature increases in the center of a nebula, thereby, causing the small nuclei of atoms to fuse.

Stage 2: The nebula gets hotter and brighter as the nuclear fusion sets off a chain reaction while providing enough energy to turn the nebula into a star.

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