question
(a) draw a diagram of a fully developed embryo sac of an angiosperm. label its chalazal end and any other five parts within the embryo sac.

(b) why does the development of an endosperm precede that of the embryo in angiosperm ?

(c) number of chromosomes in an onion plant cell is 16. name the cells of the embryo sac having 16 and 24 chromosomes formed after fertilisation.
a)



antipodals side is called chalazal end.

b) becausethe cells get packed with reserve food supplies, used for providing the nutrition to the developing embryo.

c)cells with 16 chromosomes is calledzygote and cells with 24 chromosome is called endosperm
different cells in the body have different instructions or marching orders as to how they are to grow and function. sometimes clumps of cells with diverse marching orders form a tumor and mature into very different types of tissue. one type is called a dermoid cyst. these can contain a variety of different tissues including hair. see more... chloroplast is a powerhouse for the synthesis of carbohydrates in plants. it is broadly divided into three parts (fig 3) namely:a) membrane: chloroplast is double walled organelle viz. it contains inner and outer membrane.b) stroma corresponds to the cytoplasm of chloroplast. it also serves as site for dark reaction of photosynthesis to take place.c) thylakoids/ granum: thylakoids contains chlorophyll that absorbs light. stacks of thylakoids are known as granum.fig 3 shows different parts of chloroplast to answer this question we have to take into account several aspects. 

the first of these is the assessment of the male factor. when we speak of oligoazoospermia we refer to a low concentration of sperm in the semen. we consider an altered concentration when there are less than 15 million spermatozoa per milliliter (ml) of ejaculate. 

but although 15 million per ml is the reference parameter for talking about oligoazoospermia, when we assess the seminogram we must take into account the degree of deviation from that normality. that is, a concentration of 13 million/ml, where we would speak of a mild oligoazoospermia, is not the same as 1 million/ml, where we would speak of a severe oligoazoospermia. in addition we must also assess the other parameters of the study of the semen (total volume, motility). 

in order to group all the important parameters of the seminogram into a single value that will help us decide which assisted reproduction technique to use, the concept of msc (mobile sperm count) is established. this tells us the number of spermatozoa with good motility in each milliliter of ejaculate after the training of the semen in the laboratory. 

it is considered that in order to perform an artificial insemination (ai), the msc must be over 3 million spermatozoa. 

therefore, as far as the male factor is concerned, it will depend on the severity of the oligoazoospermia and how it influences the msc whether the technique of choice is an ai or, on the contrary, we have to opt for a more complex technique, such as in vitro fertilization (ivf). 

the second aspect to take into account is the female factor. in this case we are presented with a woman with a polycystic ovary syndrome (pcos). pcos is an endocrine pathology that is often difficult to achieve ovulation. when a woman is unable to ovulate, she will not be able to become pregnant and the clinic that most women with pcos consult for will appear, which is the absence of menstruation. 

thus, what we must do with this patient is to give her medication to help her achieve, first, follicular development and, later, ovulation. once ovulation is achieved, the semen sample should be added either by ai or by directed intercourse. one option or the other will depend on the quality of the semen. 

to achieve ovulation in a patient with pcos we perform an "ovulation induction" treatment. for this we have several therapeutic options. as first-line drugs we would have the drugs for oral administration (clomiphene citrate and letrozole) and, as second-line treatment, we would have the drugs for subcutaneous administration (gonadotropins). 

even so, before considering ovulation induction treatment in a patient with pcos, we should assess the patient's age. the main reason for this is that ovulation induction treatments end with ai or directed intercourse. it is known that women over 38 years of age do not benefit from these techniques due to poor egg quality. in such cases, the first option should be an ivf. 

therefore, and in response to the initial question, the most likely treatment of choice for this couple is ai with ovulation induction, but before indicating such a technique we must take into account other parameters such as emr and the age of the patient. yeah, its an incomplete genetic code, having only half the required chromosomes needed to create a life. it also doesn't consume food and produce waste, it cannot itself reproduce, etc. its clearly and obviously, as long as your not an anti science person, not a human being but a fetus is (again so long as your not anti-science). the term sperm implantation is actually incorrect and we suppose it refers to egg fertilization. what implants is the embryo after the sperm reaches the egg, and they fuse together. after that, the resulting embryo travels through the fallopian tube toward the uterus. once there, it will adhere to the endometrial lining, which is what we know as embryo implantation.

you can learn more about this process here: sperm's journey to the egg. yes, the plants have chloroplasts and they have chromoplasts. 

chromoplasts contain pigments, just like chloroplasts, but the pigments are not photosynthetic. their abundant pigments overwhelm the light reflected from the chloroplasts making the leaf another color. chromoplasts are what color flowers, fruit and other plant parts. the function of chromoplasts pigments can be as a signal or protective.

chromoplast content in leaves varies naturally in plants. plants with more chromoplasts can survive regions of marginal nutrient resources because they are better protected from both oxidative and uv stress. the green leaved sugar maple is more sensitive to nutrient stresses associated with low ph soils than the red maple acer rubrum. acidic soils are less fertile. an increase in chromoplast content can mediate the negative effects of nutrient imbalances on maples by relieving uv & oxidative stress. red maples can out compete other maples for nutrient poor acidic soils by having more chromoplasts. 
http://www.ingentaconnect.com/content/bsc/pce/2005/00000028/00000007/art00005 
http://www.rsc.org/delivery/\_articlelinking/displayhtmlarticleforfree.cfm?journalcode=pp&year=2005&manuscriptid=b417802e&iss=4

chromoplasts content in flowers signals to pollinators while in fruit it signals to seed dispersers when the plant is ready for them. chromoplasts are not different organelles they are chloroplasts that continued to mature with regulation to produce more carotenoids or anthocyanins than chlorophylls. a 5aa blastocyst is probably one of the best embryos that we can get, but, unfortunately, having a good morphology does not necessarily mean that the embryo is of good quality.  it only means that the chances of having normal genetics and implantation are going to be higher.
when we grade an embryo 5aa, it means that it has almost done the hatching, and both the inner cell mass and trophectoderm are of top quality.  the chances for one of these embryos, though it will depend on the age if we get this quality in egg donation, the pregnancy rate should be around 60-65% with just a single embryo transfer. <p>power house of the cell</p><p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"><span style="box-sizing: border-box; font: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline;"><u style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; font: inherit; vertical-align: baseline;">mitochondria:</u></span></p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"> </p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"><span style="box-sizing: border-box; font: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline;">mitochondria</span> are the organelle present in the cell, which can be seen only through electron microscope. they are spherical or elongated organelle in the cytoplasm of nearly all eukaryotic cells, containing genetic material and many enzymes important for cell metabolism.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"> </p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"><span style="box-sizing: border-box; font: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline;"><u style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; font: inherit; vertical-align: baseline;">structure:</u></span></p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"> </p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">they are bounded by a <span style="box-sizing: border-box; font: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline;">double membrane</span> the outer membrane projects to the cytoplasm and the inner membrane project into the <span style="box-sizing: border-box; font: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline;">matrix.</span></p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">the inner membrane is convoluted into several folds, called <span style="box-sizing: border-box; font: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline;">“cristae.”</span> the surface area of the inner membrane is increased by cristae. matrix contains a concentrated mixture of enzymes, which play an important role in the metabolism of nutrients.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"> </p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"><span style="box-sizing: border-box; font: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline;"><u style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; font: inherit; vertical-align: baseline;">function:</u></span></p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"> </p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">the main function of mitochondria is <span style="box-sizing: border-box; font: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline;">energy production.</span> and so, because of this function, they often called as “power hoses of the cell.” the metabolism of nutrients takes place in the matrix by the enzymes present it. oxidative phosphorylation is the main metabolic process through which atp (adenosine triphosphate) is generated.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">depend upon the energy needs; their occurrence varies from cell to cell. for example, skeletal muscles have more mitochondria; whereas red blood cells are completely lack of mitochondria.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"> </p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">explanation of their function</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"> </p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">1.the main function of mitochondria is to perform cellular respiration this means it takes in nutrients from cell ,breaks it down ,and turns it into energy</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">it is called as power house of cell because the process of atp formation takes place in mitochondria.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">2.it helps cells to maintain proper concentration of calcium ions within the compartments of the cell.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">3.it also helps in building certain parts of blood and harmons like testosterone and estrogen.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">4.liver cell mitochondria have enzymes that detoxify ammonia.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;">5.they plays an important role in the process of apoptosis.</p>
<p style="box-sizing: border-box; font-size: 14px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: 'open sans', sans-serif; vertical-align: baseline; color: #333333; background-color: #ffffff; margin: 0px 0px 5px !important 0px;"><img src="https://s3.amazonaws.com/si.experts.images/answers/2021/06/60cc394f7dc8d\_1623996748448.jpg"></p> (a) the candidate was studying the effect/importance of sunlight on the rate of photosynthesis.explanation: the candidate had covered one part of the leaf to study the rate of photosynthesis in the absence of sunlight. the candidate would compare it with the rate of photosynthesis on the uncovered parts of the leaf and thus, determine the role of sunlight during photosynthesis.(b) yes, the uncovered portion of the leaf of the potted plant is used as the control here.explanation: the control is used to compare the results which will be obtained after the experiment with the covered portion of the leaf to obtain conclusions.(c) plant was kept in the dark before the experiment, to remove the starch present in the leaf, to the storage organs.explanation: destarching is done by placing the plant for 24-48 hours in darkness before starting the experiment. this is done to make sure that all starch has been formed under experimental conditions only.(d) 1) first, the candidate would have dipped the prepared leaf in boiling water to kill the leaf cells.2) then he would have boiled the leaf in methylated spirit to remove the chlorophyll.3) the leaf would have then been placed in hot water to soften it.4) he would have placed it in a dish and poured iodine solution. the presence of starch is confirmed in regions that turn bluish-black in colour.the uncovered portion of the leaf would have turned bluish black and the cover region would have turned brown in colour.explanation: the uncovered portion of the leaf would have turned bluish black as starch would have formed in those regions. sunlight activates the chlorophyll, which in turn catalyzes the photosynthesis reaction. in the covered portion, on which sunlight could not have penetrated, the region turns brown due to the absence of chlorophyll. this implies that photosynthesis would not have taken place on the covered portion of the leaf. Hello Miilla,



  

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The difficulty of couples in having a baby can be caused by fertility problems in women and men. Fertility disorders in men often occur due to lack of quality and quantity of sperm cells. Therefore, sperm analysis is one of the most frequently performed examinations in cases like this.



  

Various indicators will be assessed in sperm analysis, including sperm cell concentration, motility and morphology, semen liquid volume, acidity level, time of liquefaction, as well as fructose levels. Ideally, sperm analysis checks are indeed carried out on direct examination from the examining doctor. If it is needed, this examination can be done independently on the examination of the patient. However, given the interpretation of the results of the analysis of sperm cell analysis must also be done directly by a doctor, then you should continue to consult a doctor or a specialist in urology surgery. With his competence, after checking your general health condition, he certainly understands more whether it is necessary for you to undergo a sperm analysis examination or not.



  

To take the examination specimen, the doctor will generally invite you to ejaculate in a special place, then then collect the ejaculation fluid that comes out in a container. In some conditions, you can also do this ejaculation at home, that is by masturbating or ejaculating during sexual intercourse that is accommodated in a special condom (not just any counselor). However, even if it is done at home, this ejaculatory fluid must be stored at room temperature and taken directly to the doctor in less than 1 hour to be examined. Before taking a specimen, to get accurate results, you need to delay sexual intercourse and masturbation for 2 to 3 days in order. Also avoid consuming alcohol, caffeinated minerals, drugs, or any supplements without first consulting a doctor. So that the results are right, this examination can also be repeated 2 to 3 times in 2-3 weeks.



  

Hope this helps ...