one correctly describes reproduction and life cycle of fern is Spore → Gamete → Prothallus → Sporophyte
The correct option is (A).
Option A correctly describes the reproduction and life cycle of a fern. Here's a detailed explanation:
1. Spore Formation: The life cycle of a fern begins with the formation of spores. Spores are reproductive structures produced by the sporangia located on the undersides of fern leaves called fronds. These spores are haploid, meaning they contain half the number of chromosomes compared to the parent plant.
2. Gamete Formation: Spores germinate and develop into gametophytes, specifically a small, heart-shaped structure called a prothallus. The prothallus produces both male and female gametes through mitosis. These gametes are haploid as well.
3. Fertilization: Male gametes (sperm) swim to female gametes (eggs) on the prothallus and fertilization occurs, forming a diploid zygote.
4. Sporophyte Formation: The zygote develops into a new sporophyte, which is the familiar fern plant that we recognize. The sporophyte grows and develops, producing fronds and eventually sporangia.
5. Spore Production (Again): Sporangia develop on the undersides of mature fronds of the sporophyte. Inside the sporangia, diploid cells undergo meiosis to produce haploid spores, completing the life cycle of the fern.
Option A follows the correct sequence of events in the fern life cycle, starting from spore formation, through gamete production and fertilization, to the formation of the sporophyte, which eventually produces spores again. Therefore, option A correctly describes the reproduction and life cycle of a fern.
complete question given below:
Which one correctly describes reproduction and life cycle of fern?
A Spore → Gamete → Prothallus → Sporophyte
B Gamete Spore Prothallus → Plant
C Prothallus → Sporophyte → Gamete → Fern
D Sporangia Spore → Prothallus → Sporophyte → Plant
A flood kills most of the population of ants that live near river water
Answer:
A minor, usually, form of evolution that works best in small populations or in situation as you have described above.
Explanation:
How conditions in the biome affect the plant and animal life in contains
Glycolysis and the citric acid cycle are similar in that they both produce ______
While observing the sun, you note a large number of sunspots. what can you conclude?
A large number of sunspots indicates an active phase in the solar cycle with increased magnetic activity on the Sun's surface. It also suggests heightened solar activity, such as flares, and signifies a period close to the sunspot maximum phase of the cycle.
Explanation:Observing a large number of sunspots suggests that the Sun is in an active phase of its solar cycle. Sunspots are large, dark features on the Sun's surface due to increased magnetic activity. They are cooler regions compared to the surrounding areas, typically around 3800 K versus the brighter regions at about 5800 K. The occurrence of sunspots is associated with the solar cycle, which has an average period of 11 years, fluctuating between periods of sunspot maximum and minimum.
During the maximum phase, more than 100 spots can often be seen on the Sun’s surface. The frequency and number of sunspots can also indicate heightened solar activities such as solar flares, which occur more often near sunspot maximum and contribute to more conspicuous solar phenomena like a stronger solar corona. Careful and regular observation allows one to track these sunspot cycles and understand the patterns of increased and decreased solar activity.
Extracellular pathogens such as viruses and bacteria in body fluids are attacked by _____. view available hint(s)
19. (03.06 HC)
Some individuals have a mutated recessive allele and a homozygous individual is resistant to HIV infection and AIDS. Some populations have a high frequency of the mutant allele. What inference can be made about the mutant allele? (1 point)
Heterozygous individuals must be genetically advantaged even if they are not resistant to HIV.
The mutated allele must have developed and been acquired by many people before exposure to the virus.
The mutated allele must not be inherited by offspring or the disease would be close to eradication.
Being homozygous is an advantage for the mutated allele, while being heterozygous is a genetic disadvantage.
20. (03.07 MC)
Some portion of the milk produced in the United States comes from cows treated with genetically manipulated hormones that increase a cow's milk production. This increased production helps farmers make a better return on their investment in each cow. What aspect of this biotechnology must be fully understood before the benefits can be justified? (1 point)
Its effect on the cost of production
Its effect on other animals in the dairy
Its effect on the offspring of the cow
Its effect on consumers of the milk
21. (03.07 HC)
What issues will society need to resolve regarding this developing biotechnology, such as recombinant DNA technology? (1 point)
The issues regarding the cost of these procedures for patients
The question of who gets to benefit from these technologies
The issues surrounding its lack of medical benefits
The question of the long-term effects on consumers and the targeted species
22. (03.08 MC)
Marissa and Sean are in the process of adopting a baby. One of the documents the adoption agency provides is a full medical history of the birth mother. Why would the birth father's medical history also be important? (1 point)
The father has greater impact on the health of the baby than the mother.
The father's history will be important only when the child also becomes a parent.
The father's medical problems will always be expressed in the child.
The father's history will suggest potential medical problems in the baby.
23. (03.08 MC)
Paul's father and paternal grandfather both contracted but survived prostate cancer with treatment. Which answer best explains what this means for Paul? (1 point)
Paul should know he has a higher risk of prostate cancer and take preventative steps.
Paul should not worry about this history as both survived the cancer.
Paul should have his prostate removed as soon as possible.
Paul should live a healthy lifestyle and not worry about cancer at all.
24. (03.08 MC)
Which of the following would most severely affect a human population? (1 point)
A high degree of genetic similarity among people
A high degree of illegal drug use among young adults
A high number of smokers in a community
A high rate of mental disorders
25. (03.08 HC)
Meredith's office had a large group of people out sick at the same time with the flu. Which of the following is the most likely cause of the mass illness? (1 point)
Lack of cleanliness in the office kitchen
Mutation in the type of flu virus, making it resistant
Germs being spread by person-to-person contact
Inadequate ventilation system in the office
Answer:
19. The mutated allele must have developed and been acquired by many people before exposure to the virus.
20.
21. The issues surrounding its lack of medical benefits
22.
23. Paul should know he has a higher risk of prostate cancer and take preventative steps.
24. A high degree of genetic similarity among people
25. Germs being spread by person-to-person contact
Explanation:
Many diseases, including general diseases, require the general prevention methods. These include diagnostics, prevention, and monitoring.
The shuffling of chromosomes that occurs during both fertilization and _____ can lead to genetic variation. the shuffling of chromosomes that occurs during both fertilization and _____ can lead to genetic variation. natural selection genetic drift mutation meiosis mitosis
Some embryos do not survive through to the fetal stage, which begins about two months after fertilization. When this happens, the mother is said to have had A) endometriosis. B) a miscarriage. C) a toxic shock. D) an implantation.
Answer:
It's B trust me
Explanation:
Miscarriage
Energy derived from hot rocks and fluids beneath the earth’s surface is _____. electro magnetic energy thermal energy geothermal energy heat energy
The answer is geothermal energy. This energy can be harnessed to generate electricity. The energy emanates from the deep core of the earth due to the radioactivity of the rocks in the region. The radioactivity heats Magma from the mantle which subsequently heats the rocks and fluids in the earth crust.
Nerve roots in the spine are the key component of intervertebral disks.
a. True
b. False
Answer:
The correct answer is - false.
Explanation:
The nerve root is the beginning part of a nerve that leaves CNS and the spinal cord. It is the initial part of the nerve that is present in between the intervertebral disks and runs through spines which acts as a shock absorber and protects these nerves to any type of damage to these nerves.
The nerve root is not the component of the inter-vertebral disks but initial part of the nerves which are protected by these shock absorbers.
Thus, the correct answer is - false.
Which of the following is an example of a metamorphic rock? Granite limestone marble pumice WILL MARK BRAINLIEST IF CORRECT HURRY
Answer:
The answer would actually be Marble
The example of a metamorphic rock is Mable.
What is metamorphic to k?Metarmorphic rock is a type of rock that is formed from solidification and transformation from igneous rocks or sedimentary rock to another form rock.
Therefore, The example of a metamorphic rock is Mable.
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Fungi can be unicellular and multicellular.
True or false?
The statement is true: fungi can indeed be both unicellular, like yeasts including Saccharomyces cerevisiae and Candida species, and multicellular, forming complex structures such as molds and mushrooms. Dimorphic fungi can even switch between these states depending on environmental conditions.
Explanation:The statement that fungi can be unicellular and multicellular is true. Fungi include a wide range of organisms with diverse characteristics, from microscopic yeasts to large, complex molds and mushrooms. For example, yeasts, like Saccharomyces cerevisiae (baker's yeast) and Candida species (known for causing thrush), are unicellular fungi, thriving in various environments and under different conditions. On the other hand, multicellular fungi develop complex structures, such as molds and mushrooms, with networks of hyphae contributing to their vegetative body, known as a thallus. Notably, some fungi, known as dimorphic fungi, possess the remarkable ability to switch between unicellular and multicellular forms depending on environmental conditions. This dual nature highlights the adaptability and diversity within the fungal kingdom.
Many cars use electricity stored in lithium ion batteries as an alternative fuel. While there are many positive benefits to this technology, what negative impacts do they present?
Answer choices:
A)
Reduces air pollution
B)
Decreases carbon emissions
C)
Disposal of spent batteries
D)
Cut dependence on fossil fuels
All head injuries should be treated as ________ , and require ________.
Out of the following given choices;
A. unimportant; no medical attention
B. stable; the R.I.C.E. formula
C. severe; immediate medical attention
D. severe; the R.I.C.E. formula
The answer is C. Head injuries should never be overlooked. This is because the brain could be damaged yet it is the most important organ of the body. Many symptoms of serious brain injury won’t appear right away. Some injuries result to internal hemorrhage that is not detected then but later causes serious brain damage such as intracranial hematoma.
Answer:
Yes it’s C give her/him brainlest
Explanation:
A 60-year-old woman is hospitalized after losing an extensive amount of blood in a work-related accident. she tells the nurse that she heard the doctor say that she would keep feeling faint until her brain made more blood. the nurse recognizes that when the woman's blood pressure dropped, the pressure in her carotid arteries decreased. this was detected by baroreceptors in the carotid arteries, with which subsequent effect?
How is feedback inhibition important to the body systems?
- The body is more efficient when it ignores feedback
- The body systems have a chance to work in isolation.
- reaction to a stimulus helps maintain homeostasis.
- reaction to a stimulus controls the external environment.
The correct answer is reaction to a stimulus helps maintain homeostasis.
If fertilization does not occur, the uterine lining is shed in a process called
Your spinal cord works like a a0 wire, sending messages back and forth between your body and your brain.
Answer:
Telephone wire
Explanation:
The spinal cord can be compared to a telephone wire. This is because both of these objects operate in similar ways. A telephone wire allows a message to be transmitted from the speaker to the listener. In a similar way, the spinal cord allows a message to travel between your body and your brain, fulfilling an important role.
The piece of dna that will be made into an rna and eventually a protein is called a
Which action must occur for an enzyme to catalyze a chemical reaction?
A. A noncompetitive inhibitor must first bind to an active site.
B. A competitive inhibitor must first bind to an active site.
C. A substrate must bind to an allosteric site of the enzyme.
D. A substrate must bind to an active site of the enzyme.
A complex big molecule that fastens the metabolic reactions without actually participating in it is called an enzyme. They fasten the formation and breakdown of the metabolic and catabolic reactions.
The actions that are required in a chemical reaction is:
Option: D. Active site of an enzyme must be attached to a substrate.
This can be explained as:
If a non-competitive binds to the active site then the substrate would not be able to bind to the site and a chemical reaction would not occur.If in the second option a competitive bind to the active site it will block the substrate to bind on the active site of the enzyme and the complex would not be able to form.If a substrate binds to an allosteric site then it will inhibit or activate the enzyme.Therefore, the enzyme can catalyze chemical reactions when the substrate binds to the active site.
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Which of the following can be cofactors?
organic molecules
inorganic molecules
anions
cations
organic molecules and cations
Answer:
your answer is below
Explanation:
Why might genetically engineering a crop to be herbicide resistant result in producing weeds that are herbicide resistant?
The genetically engineered design is flawed so weeds are not affected.
The weeds that are not affected by the herbicide are able to reproduce.
Insects that are not affected by the herbicide can pollinate new species of weeds.
The weeds will become tolerant to the herbicide through repeated exposure.
Herbicide resistant weeds can emerge when genes flow from genetically engineered crops to weeds via cross-pollination, or the weeds develop resistance through repeated exposure to the herbicide.
Explanation:Genetically engineering a crop to be herbicide resistant might result in producing weeds that are herbicide resistant through a process known as gene flow. This happens when the genetically engineered crops cross-pollinate with nearby weeds. Some of the offspring of these weeds could inherit the herbicide resistance trait, making them more likely to survive and reproduce in an environment where that herbicide is being used. Over several generations, this could result in a population of weeds that are resistant to the herbicide. In other cases, weeds may become herbicide resistant through repeated exposure to the herbicide, which can lead to the evolution of herbicide resistance.
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Which of the following best describes an effective adaptation of plants commonly found in the rain forest?
the following correctly describes plant and animal adaptations of a particular biome is Savanna plants have deep root systems and tundra animals have fur or feathers with seasonal color variations.
The correct option is (b).
1. The Savanna biome is characterized by hot and dry conditions, with periodic droughts. Savanna plants have adapted to this environment by developing deep root systems that can reach water stored deep underground, allowing them to survive during dry periods.
2. In contrast, the Tundra biome is characterized by cold temperatures and a short growing season. Tundra animals have adapted by growing thick fur or feathers with seasonal color variations, which help them blend into their surroundings and provide insulation against the cold temperatures.
3. These adaptations in both plants and animals are essential for their survival in their respective biomes, allowing them to thrive despite the challenging environmental conditions.
complete question given below:
Which of the following correctly describes plant and animal adaptations of a particular biome?
a-Desert plants have modified leaves to prevent water loss and megafauna are found in deciduous forest leaf litter (detritus).
b-Savanna plants have deep root systems and tundra animals have fur or feathers with seasonal color variations.
c-Chaparral plants are adapted for wildfires and savanna animals have thicker fat deposits.
d-Epiphytes are found in tropical rainforests and nocturnal animals are found deciduous forest canopies.
In two or more complete sentences describe how a dam placed in a river can act as both a constructive and destructive force.
Answer:
Dams are constructed over the narrow valleys and it acts like a barrier that obstructs the water from the flow. There are both advantages as well as disadvantages in constructing a dam.
Some of the constructive force or advantages of dams are as follows-
1) It generates electricity .
2) It is often used for irrigation and industrial purposes.
3) it is used for farming purposes in water such as raising as well as harvesting of fishes and other aquatic plants.
Some disadvantages are-
1) It degrades water quality.
2) Aquatic organisms are affected thereby harming the ecosystem.
3) It obstructs the flow of water.
4) Failure of a dam causes flood.
A metal surface becomes dull on exposure to air. phyiscal or chemical change?
Explain the effect that extreme vagus nerve stimulation had on the heart. how well did the results compare with your prediction?
Extreme stimulation of the vagus nerve can decrease heart rate significantly, causing symptoms ranging from dizziness to cardiac arrest. These effects are predictable given the vagus nerve's role in the parasympathetic nervous system.
Explanation:The vagus nerve, also known as the tenth cranial nerve, is primarily responsible for the regulation of internal organ functions. When the vagus nerve is stimulated excessively, it results in what is known as the vagal response. This response can significantly decrease the heart rate, leading to symptoms such as dizziness, fainting, or in extreme cases, cardiac arrest. The results of extreme vagus nerve stimulation on the heart are generally predictable based on understanding the function of the vagus nerve in the body's parasympathetic nervous system.
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1. Where trenches do not exist, the steep continental slope merges more into a more gradual incline known as the continental____.
a. abyss
b. rise
c. zone
d. rift
2. Deep, steep-sided valleys that originate on the continental slope and may extend to the ocean basin floor are called____.
a. slope canyons
b. submarine canyons
c. abyssal plains
d. trenches
The right options are;
1. b. rise
2. b. submarine canyons
Continental rise is the bottom feature of water that is composed of thick sequences of continental substances that coalesced between the continental slope and the deep ocean floor. Continental rises occurs due to three sedimentary processes which are vertical accumulation of biogenic and clastic substances, mass wasting and the deposition from contour currents.
Submarine canyons are deep, narrow steep-sided valleys that emanate from the continental slope and sometimes may extend to the ocean basin floor (continental shelf). The physical appearance of submarine canyons resembles canyons formed by rivers on land.
Why is it important for arteries to have thicker lining/walls than veins?
Is the chromosome number related to the complexity of the organism?
Compaction is most significant as a lithification process for sedimentary rocks composed of sand-sized particles.
a. true
b. false
Answer:
False
Explanation:
Lithification is defined as the summation of compaction and cementation. Finer materials undergo compaction due to the force exerted by the overlying sediment layers. Clay particles (diameter < 0.002mm) undergo more compaction because they are finest in terms of size whereas silt (diameter 0.002-0.06mm) and sand-size sediments (0.06-2mm) are relatively coarser..
So, compaction is relatively a more significant process for clay particles than the silt and sand-sized particles.
Hence the given statement is false.
Compaction is NOT the most significant process as a lithification process for sedimentary rocks composed of sand-sized particles.
Sedimentary rocks are as a result of compaction, lithification and cementation.
Further ExplanationRock A rock is a naturally occurring substances that is a solid mixture of one or more minerals together with organic matter.Rocks are classified based on the chemical composition, texture and the way they are formed. Sedimentary rocks Sedimentary rocks are types of rocks that are formed through accumulation of sediments at low temperatures in tectonic layers and sinks. The process involved include compaction and cementation of sediments.These sediments includes; pebbles, shells, sand and other material fragments. The sediments accumulates in layers and then harden into rocks over a period of time.Examples of sedimentary rocks include; limestone and conglomerateLithification, cementation and compaction
Lithification is the process by which sediments combine to form sedimentary rocks. Compaction involves the consolidation of sediments due to the intense pressure and weight of the overlying deposits. Compaction takes place when sediments get buried.Cementation is the process through which dissolved minerals crystallize and glue grains of sediments together.Other types of rocks Metamorphic rocksThese are types of rocks that are formed as a result of changes that occurs due to intense heat and pressure under the surface of the earth. They result from action of heat and pressure on other rocks that pre-existed.These types of rocks are characterized by shiny crystals, ribbon-like layers among other features.Examples of metamorphic rocks are marble and gneissIgneous rocks These are types of rocks that are formed as a result hardening and cooling of magma from volcanic eruptions. Magma may cool inside the earth or when on the surface of the earth as a result of volcanic eruptions. The lava from this eruptions cools and hardens to form metamorphic rocks.Igneous rocks are glass-like and shiny with no crystals. They may also have tiny spaces and holes due to gas bubbles trapped during the cooling process.Examples of igneous rocks include obsidian and basalt.Key words: Rocks, lithification, cementation and compaction, sedimentary rocks, examples of sedimentary rocks, other types of rocks.
Learn more about;Rocks and rock types; https://brainly.com/question/1542533Sedimentary rocks;https://brainly.com/question/1542533Igneous rocks; https://brainly.com/question/1542533Metamorphic rocks; https://brainly.com/question/1542533Level; High school
Subject: Geography
Topic: Rocks
sub-topic: classification of rocks