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BONY FISHES EXCREATE THROUGH AMMONOTELISM (a)

RER means the endoplasmic reticulum which surface contains ribosomes and is useful in protein synthesis .SER means the endoplasmic reticulum which does not contain ribosomes and it is useful for synthesis of cholesterol in body

angiosperms: rose is the answer

Functions1.Transportofnutrients, oxygen, andhormonesto cells throughout thebodyand removal of metabolic wastes (carbon dioxide, nitrogenous wastes2.Regulationof body temperature, fluid pH, and water content of cells.

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Contact forces are those in which energy is applied by human or any other object.while non contact for are defined as those which arise without any physical contact between the two objects.contact forces are mainly of following types muscular force and frictional forcenon contact forces are as follows magnetic forcegravitational force.electrostatic force

ribo nucleic acid is the right answer.

Structurally,DNA and RNAare nearly identical. As mentioned earlier, however, there are three fundamentaldifferencesthat account for the very different functionsof thetwo molecules.RNAhas a ribose sugar insteadof adeoxyribose sugar likeDNA.RNAnucleotides have a uracil base instead of thymine.

DNA :1. It usually occurs insidenucleusan d some cell organelles (Mitochondria andChloroplast in plants2. It isdouble strandedwith exception of some viruses3. DNA contains over a million nucleotides.

RNA:1. Very little RNA occurs inside the nucleus. Most of it is found in thecytoplasm.2. It issingle strandedwith exception of some viruses 3. Depending on the type, RNA contains 70-12,000 nucleotides.

all the statements are correct.

Porifera- presence of sporesAnnelida- segmentedchordata- unsegmentedechinodermata- cellular levelArthopoda- Largest phylum

Stratification

Some seeds contain germination inhibitors that break down when exposed to cold temperatures. This is nature’s way of preventing the seed from germinating before spring arrives. Stratification exposes the seeds to cold temperatures in the refrigerator, simulating a short winter. When brought back to room temperature, they germinate readily. Large seeds are easy to stratify by placing them between moist paper towels or in a jar of moist sand in the refrigerator. It’s best to plant small seeds in a tray of soil before refrigerating them. It takes between two and six weeks of cold temperatures to break down the inhibitors, depending on the type of seed.

Light

Exposure to light breaks down the germination inhibitors in some types of seeds, particularly wildflowers that produce small seeds. Press seeds that need light exposure onto the surface of moist potting medium or garden soil, but don’t cover them with soil. These seeds may take a few extra days to germinate, so don’t give up on them too soon.

Scarification

In some cases, a seed doesn’t contain germination inhibitors, but it has a seed coat that is hard and impermeable to water. This is the case with many member of the legume family. In their natural environment, these seeds are waiting for drenching spring rains that soften the coat. Before planting the seed, break through the seed coat by nicking it with a sharp knife or razor or abrade it with sandpaper or a file.

Water

Soaking seeds in water overnight softens a hard seed coat enough to allow moisture inside so that the seed can germinate. Some gardeners like to nick the seeds before soaking them, but it isn’t usually necessary. For quicker results, pour boiling water over the seeds and let them soak until the water cools. Many types of legumes benefit from this treatment, including the garden pea (Pisum sativum).

Double Dormancy

Nature sometimes increases the odds of a seed germinating at just the right time by requiring that two conditions be met. In the case of columbine (Aquilegia spp., which is hardy in U.S. Department of Agriculture zones 3 through 9), the seeds need a four-week period of stratification, followed by exposure to light. Turk’s cap lily (Lilium superbum, USDA zones 5 through 8) needs three months in moist soil at room temperature, which allows the root portion of the seeds to emerge. After the roots begin growing, it needs three months of cold temperatures to allow the rest of the seed to germinate.

Ans :- Because the pressure is the same on both sides of them. Windows get broken by pressure when there is a big pressure difference between the sides (tornado, hurricane, bomb blast).

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Apical Meristem is the tissue which is responsible for growth in plants

Answer:

In the onion of glass- A you will see that the roots have shown growth, whereas you will see that roots of onion in glass - B will show no growth...this is because of the absence of apical meristem tissue...

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mango is the common name and mangifera indica is the scientific name Yar it was so easy

option (c) is correct

correct answer is 2

2.Linn represents the name of the author i,e., Carolous Linnaeus who first coined the term Mangifera indica.

wrong

Curdis rich in proteins, riboflavin, vitamin B6 and vitaminB12. It hasnutritionalbenefits beyond those ofmilk. Buttermilk is lower in fatthanregularmilk, because the fat has been removed to make butter. It is also high in potassium, vitamin B12, calcium, and riboflavin as well as a good source of phosphorus.

Generally, themonohybrid crossis used to determine the dominance relationship between two alleles. ... Thiscrosswas originally used by biologist GregorMendel, who crossed two pea plants to obtain a hybrid variety and discovered the dominance relationships between alleles of several genes.

Weeding is the process to remove out the weeds. Weeds are unwantedvplants which grown along the useful crops. Weeding is required because weeds are competitive plants as they reduce the useful crop yield by acquiring space, fertilizers and nutrients from the soil.

DNA profiling is the process of determining an individual's DNA characteristics, which are as unique as fingerprints. DNA analysis intended to identify a species, rather than an individual, is called DNA barcoding.

Seven steps to understand DNA fingerprinting:

Extracting the DNA from cells.

Cutting up the DNA using an enzyme.

Separating the DNA fragments on a gel.

Transferring the DNA onto paper.

Adding the radioactive probe.

Setting up the X-ray film.

ThePrairiesEcozone provides habitat for many animal species. ... River valleys also offer sheltered habitats important towildlife, especially during the harsh winters. ThePrairiesoffer unique habitat for the Black-tailedPrairieDog, while its southern region is home to the Short-horned Lizard and Western Rattlesnake.

the American Buffalo and the bisonis the main animal in the prairie region, however it is nearly got extinct due to indiscriminate hunting. othe animal found in this region are rabbit's prairie dogs, coyotes and grophs.

all the options are correctas inorganic catalysts areusually small and simple moleculesnot specific for any reactions can be used for multiple reactionsnot present in living cells

nuclei; from Latinnucleusor nuculeus, meaning kernel or seed) is a membrane-enclosed organelle found in eukaryoticcells. Eukaryotes usually have a singlenucleus, but a fewcell types, such as mammalian red bloodcells, have nonuclei, and a few others including osteoclasts have many.

Donald Trump is America's President.

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The cell was first discovered by Robert Hooke in 1665 using a microscope. The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830s.

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Thusgeographical isolation is notamajor factorAsasexual reproduction iscarried out within the sameorganism, resultingorganismin next generationwillhave identical copies of DNA, so therewillbe very less genetic variant to be a cause of the speciation of anorganism.

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When a chemical reaction occurs, molecular bonds are broken and other bonds are formed to make different molecules. For example, the bonds of two water molecules are broken to form hydrogen and oxygen. Energy is always required to break a bond, which is known as bond energy.

(d) is correct option

Solar energyis arenewablefree source ofenergythat is sustainable and totally inexhaustible, unlike fossil fuels that are finite.so it is not exhaustible.

False.

Exhaustible resources are the resources which after using for many years, will not be left for future uses unlike Solar

the correct answer is C

the correct answer is C

The main function of the tail; is the propulsion system which means it helps in propelling or swim the sperm cell forward to meet theegg.

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Thecorpus luteum(Latinfor "yellow body"; pluralcorpora lutea) is a temporaryendocrinestructure in femaleovariesand is involved in the production of relatively high levels ofprogesteroneand moderate levels ofestradiolandinhibin A. It is the remains of the ovarian follicle that has released a mature ovum during a previous ovulation.

Acorpus luteumis a mass of cells that forms in an ovary and is responsible for the production of the hormone progesterone during early pregnancy. The role of thecorpus luteumdepends on whether or not fertilization occurs .

Thecorpus luteum(Latinfor "yellow body"; pluralcorpora lutea) is a temporaryendocrinestructure in femaleovariesand is involved in the production of relatively high levels ofprogesteroneand moderate levels ofestradiolandinhibin A.It is the remains of the ovarian follicle that has released a mature ovum during a previous ovulation.

a hormone-secreting structure that develops in an ovary after an ovum has been discharged but degenerates after a few days unless pregnancy has begun.

a hormone-secreting structure that develops in an ovary after an ovum has been discharged but degenerates after a few days unless pregnancy has begun.

A corpus luteum is a mass of cells that forms in an ovary and is responsible for the production of the hormone progesterone during early pregnancy.

The role of the corpus luteum depends on whether or not fertilization occurs.

Sometimes,cystscan form in a corpus luteum, which can lead to painful symptoms. These cysts can go away on their own, but some may require treatment.

In this article, we examine the role of the corpus luteum and how it forms. We also take a look at what happens when corpus luteum cysts form, and what can be done about them.

corpus luteumis a mass of cells that forms in an ovary and is responsible for the production of the hormone progesterone during early pregnancy. The role of thecorpus luteumdepends on whether or not fertilization occurs.

corpus luteum is a mass of cells that froms in a overy and is responsible for the production of the hormone progesterone during early pregnancy. the role of the corpus luteum depends on whether or not fertilization occurs.

corpus luteumis a mass of cells that forms in an ovary and is responsible for the production of the hormone progesterone during early pregnancy. The role of thecorpus luteumdepends on whether or not fertilization occurs.

1. corpus luteum is seen during the oogenesis process....2. it is the next stage when the secondary oocyte rubtures the wall of antrum..3. it secreats progesterone during early pregnancy

b. Endometrium

The answer is option A

are u sure? In the question it is asked unlikely... not likely...

ok... may be the answer is (b)

Corpus callousm is located in the cerebral cortex

The corpus luteum’s main function can be distilled down to its role in supporting the early phases of pregnancy in the female body.

It does so by releasing progesterone and estrogens.

This mixture will cause the uterine mucosa to undergo all of the changes it needs to prepare for the successful implantation of a fertilized embryo.

Progesterone is mostly released in the latter half of the menstrual cycle in a timeline that matches the structural changes occurring in the ovaries.

Capillariesare very thin blood vessels that were first discovered in frog lungs in 1661. They bring nutrients and oxygen to tissues and remove waste products.

Ans :- 10 and 19 years

Adolescence begins with the onset of physiologically normal puberty, and ends when an adult identity and behaviour are accepted. This period of development corresponds roughly to the period between the ages of10 and 19 years, which is consistent with the World Health Organization's definition of adolescence.

Healthy eating during adolescenceis important as body changesduringthis time affectanindividual's nutritional and dietary needs. Many teens have a growth spurt andanincreaseinappetite and needhealthy foodsto meet their growth needs. Teens tend toeatmore meals away from home than younger children.