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All cells are surrounded by a plasma membrane. The membrane is composed of a phospholipid bilayer arranged back-to-back. The membrane is also covered in places with cholesterol molecules and proteins. The plasma membrane is selectively permeable and regulates which molecules are allowed to enter and exit the cell.

Allcellsspend the majority of their energy to maintain an imbalance of sodium and potassium ions between the interior and exterior of thecell. The most direct forms ofmembrane transportare passive. The passive forms oftransport, diffusion and osmosis, move materials of small molecular weightacross membranes.

same answer given by nandini chander

DiffusiomOsmosisEndocytosis

Diffusion is movement of a substance from a region of higer concentrations to the region of lower concentrations.

Diffusion is movement of a substance from a region of higer concen

Diffusion through a permeable membrane moves a substance from an area of high concentration (extracellular fluid, in this case) down its concentration gradient (into the cytoplasm). The passive forms of transport, diffusion and osmosis, move materials of small molecular weight across membranes.

it is nothing but a osmosis means the liquid enter from higher to lower concentrations or lower to higher concentrations

definition of plasma membrane is movement of a substance from a region of higher concentration to the region of lower concentration is called plasma membrane

SimpleDiffusion acrosstheCell(Plasma)Membrane. The structure of the lipid bilayer allows small, unchargedsubstancessuch as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to passthroughthecell membrane, down their concentration gradient, by simplediffusion.

Diffusion is movement of a substance's from a region of higer concen

Diffusion is movement of a substance from a region of higher concentration to the region of lower concentration

All cells are surrounded by aplasma membrane. Themembraneis composed of a phospholipid bilayer arranged back-to-back. Themembraneis also coveredinplaces with cholesterol molecules and proteins. Theplasma membraneis selectively permeable and regulates which molecules are allowed to enter and exit thecell.

diffusion is the movement of substances from high concentration to low concentration.

Theplasma membrane, also called thecell membrane, is themembranefound in all cells that separates the interior of thecellfrom the outside environment. In bacterial and plant cells, acellwall is attached to theplasma membraneon its outside surface.

water from osmosis and depend upon a material which transferred

Osmosis is the diffusion of water through a semipermeable membrane according to the concentration gradient of water across the membrane. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane and the membrane limits the diffusion of solutes in the water.

Ans :- The primary function of the plasma membrane is to protect thecellfrom its surroundings. Composed of a phospholipid bilayer with embeddedproteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates themovementof substances in and out of cells.

1. substances like CO2 & water move in & out of the cell because cell act as semipermeable membrane which allows solvent particles to pass through it while solute particles not pass through it

2. plasma membrane is called a selectively permeable membrane because it allows solvent particles to pass through it not to solute particles.

substances like co2 and water move in and out of the cell due to the process called diffusion

2) plasma membrane is called selectively permiable membrane because it allows some selective things to come in and out of the cell

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ANS 1st - Sustances Luke CO2 And Water Moves In And Out Of The Cell By Diffusion Process Through which they Passes A Semi Permeable Membrane

ANS - 2 - Plasma Membrane Is Also Called Cell Membrane Which Have Tiny(very small) Pores Over Its Body Thats Why Its Body Is Porus And Very Soft So It is Called A semi permeable Membrane

Hormones are organic chemical substances released by a cell, or organ or a gland or any body partof plants and animals that functions in the regulation of physiological activities and to maintain homeostasis.

General characteristics of hormones are asfollows:

Hormones are secreted by endocrine cells.

Hormones are chemical messengers.

Hormones are a special messengers of the body that are produced by the endocrine glands. These messengers control most of the body functions right from the primary needs like hunger to complex system and function like reproduction and emotions.

Two features of hormones are: 1) they are chemical signals that circulate in the body fluids.2) they regulate the behaviour of the target cells.

Tha Perfusion of the intervillous spaces of the placenta with maternal blood allows the transfer of nutrients and oxygen from the mother to the fetus and the transfer of waste product and carbon dioxide back from the Fetus to the maternal

1) Barrier method -in this method a barrier is place in vergina of a female or male to avoid fertilization and STD's(sexually transmitted desises)MALES - CondomFEMALE- Diaphragm

2) Chemical method- in this method a child is avoided by taking oral pills and changing the hormonal balance of the body (for females only) eg . Mall day, saheli,etc

3) IUCD - in this method a copper -T is placed in the uterus of a female which creates an atmosphere of copper in the uterus and the sperm gets killed

4) Surgical method - It is a permanent method in this method fallopian tube of a female or the vas difference of a male is stiched together to avoid fertilization

MALE - visectomyFemale- tubictomy

Humans can sense five basic tastes: salty, sweet, sour, bitter, and umami (representing chemicals known as amino acids).

3. Phytoplanktons and aquatic plants —> small aquatic animals (larvae, insects, etc.,) --> fish —> bird.

4th question

fast please because i am not well

the substance that are not decomposed by microorganisms into harmless substances are called non- biodegradables.

examples:they contaminate soil and water resources as they cannot be decomposed by microorganisms.

Vegetative propagation is a process in which any vegetative part of a plant (root, stem or leaf) gives rise to a new plant under appropriate conditions.Two advantages:(i) Large number of plants obtained in a short interval.(ii) Propagation of seedless plants is made possible.Two disadvantages:(i) No genetic variations, so, less adaptability to the environment.(ii) The disease of plants gets transferred to the offsprings.

cell is the fundamental unit of life

g)protons, Neutrons, electrons. h)greenhousei)magnet j) herbicides

graphs or curves is a graphical representation of the table

option (d)

Bryophytes in general are of little economic importance.

1)Importanceto humans and ecology. The peat moss genus Sphagnum is an economicallyimportant bryophyte. ...Bryophytesare veryimportantin initiating soil formation on barren terrain, in maintaining soil moisture, and in recycling nutrients in forest vegetation.

I have 2 more options ( 3)- bryophytes are shade and humidity loving plants. (4)-bryophytes are widely distributed on Earth

please solve my all questions today it is very urgent

Frogsand toads are right in the middle of the food chain and provide a very efficient transfer of solar energy. (See the end ofFrogand Toad Basics) They play animportantrole in consuming insects and are animportantfood source for birds, snakes, and other animals throughout the food web.

Frogs play a central role in many ecosystems. They control the insect population, and they're a food source for many larger animals. To keep things in balance, frogs use lots of survival tools. Some run away, play dead or swell up when threatened. Others have more sophisticated defenses. Many use color as a warning or ascamouflage. For example, the four-eyed frog,Physalaemus nattereri, has two spots that look like eyes near its back legs. It shows these spots to predators, making it look like a more threatening animal.

1.Beneficial effects of Bacteria:

Bacteria play important roles in different fields such as agriculture, industry etc. Some of them are mentioned below:

A)Role in agriculture

a)Scavenging Role:b)Nitrificationc)Production of Organic Manured)Preparation of Ensilagee)Production of fuelf)Disposal of sewage

B)Role in Industry

a)Dairy Industryb)Production of Organic Compoundsc)Fibre Rettingd)Curinge)Production of Antibioticsf)Production of Vitamins

Role in environmental pollution: Lichens are very sensitive to atmospheric pollutants such as sulphur dioxide. They are unable to grow in towns, cities and around industrial sites such as oil refineries and brickworks. So, the lichens can be used as reliable biological indicators of pollution

What is the question

A patient needs to be on glucose when the amount of glucose is low in the body

her khavathiiii murthu that chhhe

Yes when we sneeze our heart stops for milliseconds

No the ovulation and menstruation doesn't occur till birth of baby in order to prevent blood loss from baby and also there no space for another fertilised egg.

It is excretory system

Liver is a part of digestive system.

liver is the part of digestive system

Theexcretory systemremoves the waste materials presentin theblood. The primary components of theexcretory systemare thekidneys, the ureter, theurinarybladder, and the urethra.

Plantsuse a variety of techniques to remove waste materials. Oxygen, a by-product of photosynthesis is removed through stomata.

coiled tubes of nephron

option (D) is a correct answer

correct option is {D}

option d is the correct answer of the given question

option D is the correct answer

Coiled tube of nephron

glomerulus is correct

Glucose reabsorption is a process that takes place in the proximal tubule. So correct answer is glomerulus

b)A respiratory pigmentisamolecule, such as hemoglobin inhumansand other vertebrates, that increases the oxygen-carrying capacity of the blood. The four most common invertebraterespiratory pigmentsare hemoglobin, hemocyanin, hemerythrin and chlorocruorin.

c)Aquatic animalstake in the oxygen dissolved in water. The amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air. Therefore,rate of breathing in aquatic organismsis muchfaster thaninterrestrial organisms.

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(i)

(ii) The trachea is supported by c-shaped rings of cartilage which hold them in place when there is less air inside it. So, the walls of trachea do not collapse even when there is a little air.

The primary organs of the respiratory system are the lungs, which function to take in oxygen and expel carbon dioxide as we breathe.

The gas exchange process is performed by the lungs and respiratory system. Air, a mix of oxygen and other gases, is inhaled.

human respiratory system names

I)The biggestpart of the brainis the cerebrum. The cerebrum makes up 85% of thebrain'sweight, and it's easy to see why. The cerebrum is thethinking part of the brainand it controls your voluntary muscles — the ones that move when you want them to

Ii)The cerebellum is at the back of thebrain, below the cerebrum. It's a lot smaller than the cerebrum at only 1/8 of its size. But it's a very importantpart of the brain. Itcontrols balance, movement, and coordination

c is the correct answer

Ureter is the answer

a option is the correct answer

option a is correct answer

A option is the correct answer

a.Ureter is the correct option

it's ureter a long tube which urine from kidney to urinary bladder

As all options are correct hence option (4) is correct.

Fleming's Right-hand Rule(for generators) shows the direction of induced current when a conductor attached to a circuit moves in a magnetic field. ... Theright handis held with the thumb, index finger and middle finger mutually perpendicular to each other (atrightangles)

When raisins are kept in water for a few hours, the raisins will swell up or they will expand in size.

This happens due to osmosis, which is the movement of molecules from a region of its higher to its lower concentration through a semi or selectively permeable membrane.

Osmosis can be of two types, endosmosis ( the entering of solvent from high to low concentration) and exosmosis( the leaving of solvent from high to low concentration)

So :

When raisins are kept in water, the raisins has less solvent concentration and the water has comparatively more solvent concentration, which means that it will act as aHypotonic Solution.

The raisins will act as a semi permeable membrane and water will move from the outer surroundings into the raisins (endosmosis) due to which the raisinwill increase in size or swell up.

No, carbon dioxide can be produced in night also. Not all plants give oxygen at day and co2 at night. Oxygen is released during day because of photosynthesis. co2 is released due to lack of sunlight plants cant make photosynthesis.



1

Secondary SchoolScience8 points

All Plants give out oxygen during Day and carbondioxide during Night. Do you agree with statement? Give Reason.

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Answers



prmkulk1978Ace

This statement is incomplete."All plants give out oxygen during day and carbon dioxide during night"

Explanation :

Photosynthesis occursonly during day time.During this time oxygen is produced . Some oxygen is used for respiration and rest of oxygen is diffused out into air.Carbon dioxide produced during day time by respiration is used in photosynthesis.

But at night time, no photosynthesis occurs and hence no oxygen is producedoxygen from air diffuses into leaves to carry out respiration and carbon dioxide produced by respiration diffuses out into air.

Desert plants take up carbon dioxide at night and prepare an intermediate which is acted upon by the energy absorbed by the chlorophyll during the day.

there are three exceptions to this statement:- 1. non- green plants do not perform photosynthesis.2. desert plants prepare an intermediate during night.3. green plants also produce carbon dioxide during respiration but the net amount of oxygen is greater.

No, I don't agree with the given statement.When plants respire they take in carbon dioxide and give out oxygen. These gases are taken in and given out whenever plants respire.. For example desert plants take up Co2 at night and prepare an intermediate which is acted upon by the energy absorbed by chlorophyll during the day.

Adipose Tissue in animal which stores fats.

Iodine solution can be used to test the presence of starch in food items. If starch is present, it turns in to blue-black colour on the addition of iodine

Starch is the most common carbohydrate in the human diet and is contained in many staple foods. The major sources of starch intake worldwide are cereals (rice, wheat, and maize) and root vegetables (potatoes and cassava). We can use iodine solution to test for the presence of starch. If starch is present is a food item, it turns blue-black colour when iodine solution is added to it.

Subtract the fiber from the total carb count. The result is the amount of net carbs in a serving. Net carbs correspond to the amount of carbohydrates able to raise your blood sugar level. In other words, net carbs correspond to the amount of sugars and starches per serving. In the case of the canned red kidney beans, subtract the 14 grams of fiber from the 40 grams of total carbs to obtain 26 grams of net carbs.

Add iodine in the food sample...if it turns blue-black it signifies the presence of starch

Eatinga varied, well-balanceddietmeanseatingavarietyoffoodsfrom eachfoodgroups daily, intherecommended amounts. It is also important to choose avarietyoffoodsfrom within eachfoodgroup because differentfoodsprovide different types and amounts of key nutrients.

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It depends on the subject. In Social Studies, my area, the overwhelming problem is that there is too much content to cover in such a brief period of time. For example, we are meant to teach U.S. History from 1600 to 2018 in only 18 weeks; the state has to choose what history to keep and what to ignore.

Furthermore, some subjects require end-of-course exams, which guarantees that teachers will have to teach to the test in some capacity. It is a disservice to the students to teach to the test, but at the same time, it’s a disservice to not prepare them for the test

Ans :- Inter cropping is a farming method that involves planting or growing more than one crop at the same time and on the same piece of land.

The most important goal of intercropping is to produce greater number of crops at the same time thus it produce more benifits. It also helps in wise use of the land resources which could be more efficiently used by growing multiple crops at the same time that would otherwise not be utilized by a single crop.

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