b. monocot angiosperms
c. cone bearing gymnosperms Eliminate
d. seedless non-vascular plants
Answer:
D
Explanation:
The gametophyte of these lower plants produces haploid spores/gametes. These spores/gametes either produce new gametophytes or swim and fuse with another haploid spore/gamete to produce a zygote. The zygote grows into a sporophyte (the other phase of these plants’ life cycle). This is why these plants thrive in moist conditions. Examples are mosses, liverworts, and ferns.
(B) introduction of a new parasite
(C) introduction of a new mutation
(D) interspecific competition for limited resources
(E) habitat destruction
Please explain the work behind the solution
C is the correct response to this query: the introduction of a new mutation. Mutations are modifications to an organism's genetic code; while they may result in phenotypic alterations, they seldom result in extinction.
If a new predator is able to hunt down or outcompete an existing species, or if it spreads a disease or parasite, it can lead to extinction. If a novel parasite can spread swiftly and generate significant mortality rates, it may lead to extinction.
If one species is more suited and can outcompete the other species for resources, interspecific rivalry for scarce resources can lead to extinction. Last but not least, extinction may result through habitat damage if it results in a decrease in food, water, or shelter. something an organism requires to survive.
In conclusion, the introduction of a novel mutation is not seen to be a probable cause of extinction since mutations are often too gradual and the changes they bring about are typically too minor to do so.
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B) Mutations can be positive and produce organisms with improved traits.
C) Mutations can be fatal to the organism that has a mutation, if the mutation is in a critical gene.
D) Mutations can be silent, and not affect the organism that has them, if the mutation is in a non-critical area.
Answer: The correct answer is- A) Mutations must be present in parents and then passed to offspring.
Mutation can be described as the permanent change in the genetic material ( DNA) of an organism. It can be beneficial or harmful to the life form. Mutations can be heritable ( that is passed from one generation to the next) or non inheritable ( not passed from parents to offsprings).
A silent mutation ( change in the nucleotide sequence without any change in the amino acid sequence) that does not show any observable effects in the phenotype of the organism.
Thus, only option A) is not true about mutation.
All the statements are true about mutations except Mutations must be present in parents and then passed to offspring.
Thus, An organism's observable traits, or phenotype, may or may not change as a result of a mutation. Evolution, cancer, and the maturation of the immune system, including junctional variety, are among the normal and malignant biological processes in which mutations play a role.
All genetic variety originates from mutation, which also provides the basis for the action of evolutionary forces like natural selection.
Sequence changes can take many distinct forms as a result of mutation. Gene mutations can have no effect, change the gene's product, or stop the gene from working fully or correctly. Non-genic areas are likewise susceptible to mutation.
Thus, All the statements are true about mutations except Mutations must be present in parents and then passed to offspring.
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In order from smallest to largest :
Atom, base subunit, nucleotide, gene, chromosome, nucleus, cell.
A cell is the structural and basic unit of life. The study of cells from their basic structure to the functions of each cell organelle is called cell biology. Robert Hooke was the first biologist who discovered cells.
All organisms are made up of cells. They can consist of one cell (unicellular) or many cells (multicellular). Mycoplasmas are the smallest known cells. Cells are the building blocks of all living things. They give structure to the body and transform nutrients from food into energy.
Cells are complex and their components perform different functions in the body. They come in different shapes and sizes, like the bricks of buildings. Our body is made up of cells of different shapes and sizes.
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Answer:
Option). 4-5 days.
Explanation:
Morula is a 4-5 days stage of early embryonic development. It represents a solid ball, having 16 cells, known as blastomeres. In human embryo, differentiation begins with morula stage, along with cleavage to form trophoblast (an outer layers of cell) and inner cell mass.
During development, trophoblast forms embryonic part of placenta and inner cell mass form respective structures of embryo.
Thus, the correct answer is option).4-5 days.
Answer:
Day 4-5
Explanation:
The first cell differentiation occurs when the embryo reaches approximately five days after fertilization, forming the blastocyst.
In this case, the cells on the outside undergo the process of differentiation and become responsible for the formation of embryonic attachments (structures that derive from the embryo's germ leaflets but are not part of the embryo's body, such as the amnion).
In the meantime, those cells that remained inside, also undergoing the process of differentiation, become pluripotent stem cells, which are responsible and capable of forming all tissues.
Previously, when they are still undergoing the process of dividing up to 8 cells, each cell is capable of forming a complete being when inserted into an egg.
By going through the whole process and becoming pluripotent stem cells, they can form all kinds of body tissues, butno longer a complete being.