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Portal system is a part of venous circulation, which is present between two groups of capillaries, i.e., starts in capillaries and ends in capillaries. The vein which drains blood into organs other than heart is called portal vein.

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During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.

Double Circulation: In the human heart, blood passes through the heart twice in one cardiac cycle.This type ofcirculationis calleddouble circulation.Double circulationensures complete segregation of oxygenated and deoxygenated blood which is necessary for optimum energy production in warm-blooded animals

A circulatory path is a path taken by the blood, wherein it travels throughout the different organs of the body through arteries and veins. In humans, it is a closed circulatory system that exists, as blood flows in closed blood vessels. The circulatory system is responsible for the transport of gases, nutrients, waste products etc.

During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system more efficient and helps in maintaining constant body temperature.

xylem are the vascular tissue in plants which conducts water and dissolved nutrients upwards from the root and also helps to form the woody element in the stem.

Two Fusion results in the formation of = Zygote.

two fusion result in the formation of Zygote

answer will be zygote

Xylem helps in transportation of water in plants phloem helps in transportation of food in plants

Forests are considered as natural ecosystem because of the following reasons:

a. They have species of plants and animals that grow without human intervention.

b. All these species interact with each other and are interdependent on each other.

c. These are naturally sustainable.

Aforest is an natural ecosystembecause it is a natural woodland unit consisting of all plants, animals and micro-organisms (Biotic components) in that area functioning together with all of the non-living physical (abiotic) factors of the environment

forest is an ecosystem because an ecosystem is consists of many biotic and abiotic components and it is natural because of growing own without any external help of a person

it is the chapter in which you will get to know that how minerals, water and food are transported to plant mechanism or process of transportation of minerals, water and food by different tissue to various parts and places by following process

An inorganic compound is a substance that does not contain both carbon and hydrogen.

The answer is option C

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Aquarium (b) is the answer

Yes bacteria do exist in water bodies They are in aquarium as well One of the most important things an aquarium hobbyist can do to maintainwater qualityis seed their aquarium with good bacteria from an established, stable and healthy tank.Good bacteria can come from a handful of populated gravel or substrate, or a used filter pad that’s been rinsed intank water, a usedsponge filter, or even an external filter box itself. Dropping a piece of used filter pad into a new filter box helps establish a colony of good bacteria in a new tank. Growing and maintaining good bacteria is probably the single most important thing an aquarium hobbyist can do to keep a healthy tank. Protect good bacteria as if it were gold, and so many of the most common issues may never arise.

option 1.

option 1

Robert Hooke discovered the cell first time.

TheCavendish experiment, performed in 1797–1798 by British scientistHenry Cavendish, was the first experiment to measure the force ofgravitybetweenmassesin the laboratory.

the various steps involved in the management of ponds at all the three stages of culture may be classified as (i) pre-stocking, (ii) stocking and (iii) post-stocking management operations.

Adolescence is the period of physical and psychological growth between childhood and adulthood. With regard to male adolescents, masturbation-related myths may be the most frequently harbored. Male adolescents have a hormone-driven need to have sexual intercourse, frequently. Masturbation is a healthy, no-cost way to relieve sexual tension.A young man can masturbate virtually whenever he wants. Despite the guilt and misinformation implanted by adults that masturbation causes weakness, boys masturbate rather frequently. Also contrary to popular myth, the nocturnal emissions which may result in growing boys as a result of sexual excitement during a dream are completely normal and no reason for concern. Further, boys should not worry about penis size, for, when erect, they all work just fine. People grow at different rates. Menstruation starts when 17% of a woman's body weight is fat. The onset of menstruation may therefore start earlier in well-fed girls compared to in girls who are more lean. The frequency and duration of menses are not constant. Menstrual irregularity therefore does not necessarily mean that a young woman is pregnant or that professional medical treatment is required. Breasts, like penises, serve their intended function irrespective of size. The hymen is a membrane at the opening of the vagina. It may have a hole in the center or the side for the escape of menstrual blood. There are myths that an intact hymen is indicative of virginity, the hymen should be intact until marriage, and the first sexual experience should be painful for a woman. The hymen is elastic and even some prostitutes have been found to have intact hymens. The hymen also may tear due to a fall, cycling, or horse riding. Furthermore, myths exist that kissing can cause pregnancy or AIDS, homosexuality is abnormal and incompatible with heterosexual relationships later in life, and different positions of coitus may adversely affect physical health. Adolescents sorely need sources of sound scientific factual information to dispel their myths.

Matches:Sodium - (c)Nephron - (f) Endrocind gland - (d) Homologous organ - (a) Measurement of potential difference - (b)

Although the amounts of CFCs in the atmosphere are very small, measured in parts per trillion (million million), they do contribute significantly to theenhancementof the naturalgreenhouse effect, because they are very good at trapping heat. Molecule for molecule some CFCs are thousands of times stronger thancarbon dioxideasgreenhouse gases.

True. As, Sodium is an element that is a member of thealkalimetal group with a symbol Na. It is physically silver colored and is a soft metal of low density. Pure sodium is not found naturally on earth because it is a highly reactive metal

Alkynes undergo ozonolysis to give an acid anhydride or a diketone as the final product. The fragmentation is not complete in this reaction (alkenes undergo complete fragmentation). No reducing agents are required as a simple aqueous workup is followed. If the reaction happens in the presence of water, the acid anhydride undergoes hydrolyzation to give two carboxylic acids. Ozonolysis can also be used to determine the position of the triple bond in an unknown alkyne.

Ozonolysis of Alkynes Mechanism:The alkyne reacts with the ozone, causing the breakage of the alkyne. This gives rise to the ozonide intermediate. A simple aqueous workup follows with the help of zinc metal, finally yielding a dicarbonyl compound. The reaction can be written as:

Ozonolysisis an organic reaction where the unsaturated bonds of alkenes,alkynes, or azo compounds are cleaved with ozone. Alkenes andalkynesform organic compounds in which the multiple carbon–carbon bond has been replaced by a carbonyl group while azo compounds form nitrosamines

Greenhouse gases includewatervapor, carbon dioxide, methane, nitrous oxide, and ozone.

The major greenhouse gases arewatervapor, which causes about 36-70% of the greenhouse effect on Earth (not including clouds);carbon dioxide, which causes 9-26%; methane, which causes 4-9%, and ozone, which causes 3-7%.

Characteristics of the tropical forest

Because of the lack of seasonal differences, due to the geographical location of the forests, and the high humidity level the vegetation is luxuriant here. The recurring features of rainforests are basically the following:

a.high animal and vegetal biodiversity

b.evergreen trees

c.dark and sparse undergrowth interspersed with clearings

d.scanty litter (organic matter settling on the ground)

e.presence of “strangler” creepers (e.g.Ficusspp.)

f.presence of “buttresses” (i.e. large winged ribs at the base of trunks) and spindly roots in trees living in often-flooded areas.

a)The distance of stars are expressed in terms of light years.b)We measure the atmospheric pressure by an instrument called barometer.c) Coal and Oild) Fungi are heterotrophic in their mode of nutrition.e) The hardest naturally occurring substance is known as Diamond.whereas graphite is soft.

The primary greenhouse gases inEarth's atmospherearewater vapor,carbon dioxide,methane,nitrous oxideandozone. Without greenhouse gases, the average temperature ofEarth's surfacewould be about −18°C

Agriculture is the third largest contributor toglobal emissionsby sector, withmethaneaccounting for just under half of total agricultural emissions,nitrous oxidefor 36 percent, andcarbon dioxidefor some 14 percent

Option 2)Septum is the correct answer .

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The process of photosynthesis is correctly given by D) as Oxygen is released along with glucose and water.

Oxygeniswritten as O2when there are twooxygenatoms in themolecule. Pureoxygendoesn't generally exist as individual atoms, twooxygenatoms bond together to form anoxygen molecule. This is becauseoxygenis highly reactive, disconnected atoms have a very strong tendency to form bonds.

I want pencil diagram

A labelled diagram of the ear is given below.As is seen from the figure, the ear consists of three main parts namely (i) outer ear (it) middle ear (iii) inner ear.When sound enters the outer ear, it is directed to the eardrum along the auditory canal. The eardrum is a membrane which starts vibrating. The vibrations are transmitted through the middle ear through a set of is in the middle ear that the wave pressure is amplified. The amplified pressure wave enters the inner ear which includes semicircular canals and cochlea. It is in the cochlea that sound waves are translated into nerve impulses and the pitch or frequency discrimination is made when a region of the membrane is set into vibration by sound of a particular frequency, hair cells in that region are translated. The resulting nerve impulses are sent to the brain and are interpreted as sound.

A cochlearimplant is a surgically implanted device that helps overcome problems in the cochlea (KO-klee-uh). The cochlea are snail-shaped, curled tubes near nerves in the ears. They transform sound vibrations reaching the ear into signals that can be sent to the auditory nerve (or hearing nerve). The auditory nerve then sends these signals to the brain, where they're translated into recognizable sounds.

Steps Of Construction

1) Draw a line segment MO of 6 cm measurement.

2) Take M as a centre draw an angle of 60° measurement.

3) Take point O as a centre draw an angle of 105° measurement.

4) Cut OR of 4.5 cm measurement.

5) Take R point as a centre draw an angle of 105° measurement.

6) The arc of 105° angle and the arc of 60° angle intersect with each other at E.

7) Hence, MORE is a required Quadrilateral.

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