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1. EXINE is the hard outer LAYER of pollen grain.

2. It is made up of sporopollenin which is one of the most resistant ORGANIC material known.

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1. INTINE is the inner WALL of the pollen grain.

2. It is thin and continous layer made up of CELLULOSE and pectin.

This is true. CELLS are very small and we can't SEE them without a MICROSCOPE

If the xylem of a PLANT is REMOVED it will not be ABLE to TRANSPORT water from the roots to all parts of the plant and THUS the plant will wilt and finally die.

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➡️.. in the process of REGENERATION a piece is CUT from an organism it grows into complete organism. By specialised cells regeneration is CARRIED out and it is not REPRODUCTION because most organisms would not be able to GROW through pieces


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A drunkard walks unsteadily because he has consumed alcohol and alcohol which affects the cerebellumof the brain which that helps maintains the BALANCE in the BODY. Hence the body balance gets DISRUPTED, while if someone CONSUMES too MUCH alcohol.

"The depth at which soil pore SPACES or
fractures and VOIDS in rock become
completely saturated with WATER is
called the water table. GROUNDWATER is
recharged from and eventually flows to
the surface naturally; natural discharge
often occurs at SPRINGS and seeps, and
can form oases or wetlands."........

Catharanthus roseus

Explanation:

1. Catharanthus roseus, usually known as brilliant eyes, Cape periwinkle, burial ground plant, Madagascar periwinkle, old house keeper, pink periwinkle, rose periwinkle, is a TYPES of blooming plant in the family Apocynaceae.  
2. The parts that develop over the ground are utilized to make medication.
3. Periwinkle is likewise utilized for treating the RUNS, vaginal release, throat afflictions, tonsillitis, chest torment, hypertension, sore throat, intestinal agony and GROWING (irritation), TOOTHACHE, and water maintenance (edema).

1.All vertebrate have large brain inclosed in CRANIUM .
2. Notochord is present in embryonic STAGE which is replace by vertebrate in adults
3. In LOWER veribartes INTERNAL skeleton is made by cartilage.

In the CASE of human the sex determining in XY types. Out of 23 pairs of chromosomes present, 22 pairs of chromosomes are exactly same in both males and females, are called AUTOSOMES.

• In the pair of x-chromosomes are always present in the female, and the presence of an an X and Y chromosomes are determinant of male features . During spermatogenesis between males, there are two types of GAMETES are produced. Out of 100 PERCENT the 50 percentage of total sperm produced which carry the x-chromosomes and the left 50 percent has Y-chromosomes besides the autosomes.

• But female produced only one type of ovum with an x-chromosomes.

Explanation:

Thyroxine is the dominant hormone that the thyroid gland secretes into the bloodstream. This PLAYS vital roles in the process of digestion, heart and muscle, brain development, and bone maintenance. It affects almost all of the systems of the body,thus proper thyroxine levels are vital for a GOOD health.

Thyroid hormone production and release, are regulated by a FEEDBACK LOOP SYSTEM involving the hypothalamus in the brain and the pituitary and thyroid glands. The hypothalamus secretes the hormone that releases thyrotropin, which in turn stimulates the pituitary gland to produce the hormone that stimulates thyroid.

In F2 have 2 type of diffrent genotypic TALL PLANT TT Tt aap KISKA self pollination krvana chah rahe HO

The Apical MERISTEM is FOUND in the SHOOT apex ,ROOT apex and the tip of the leaves. It helps in the increase of the plant's length.

Irrigation vs. Rain-Fed Agriculture
There are two main ways that farmers and ranchers use agricultural water to cultivate crops:

Rain-fed farming
Irrigation
Rain-fed farming is the natural application of water to the soil through direct rainfall. Relying on rainfall is less likely to result in contamination of food products but is open to water shortages when rainfall is reduced. On the other hand, artificial applications of water increase the risk of contamination.

Photo of a water SPRAYER irrigating a field
Irrigation is the artificial application of water to the soil through various systems of tubes, pumps, and sprays. Irrigation is USUALLY used in areas where rainfall is irregular or dry times or drought is expected. There are many types of irrigation systems, in which water is supplied to the entire field uniformly. Irrigation water can come from groundwater, through springs or wells, surface water, through rivers, lakes, or reservoirs, or even other sources, such as treated wastewater or desalinated water. As a result, it is critical that farmers protect their agricultural water source to minimize the potential for contamination. As with any groundwater removal, users of irrigation water need to be careful in not pumping groundwater out of an aquifer faster than it is being recharged.

Types of Irrigation Systems
There are many different types of irrigation systems, depending on how the water is distributed throughout the field. Some common types of irrigation systems include:

Surface irrigation
Water is distributed over and across land by gravity, no mechanical pump involved.

Localized irrigation
Water is distributed under low pressure, through a piped network and applied to each plant.

Drip irrigation
A type of localized irrigation in which drops of water are delivered at or near the root of plants. In this type of irrigation, evaporation and runoff are minimized.

Sprinkler irrigation
Water is distributed by overhead high-pressure sprinklers or guns from a central location in the field or from sprinklers on moving platforms.

Center pivot irrigation
Water is distributed by a system of sprinklers that move on wheeled towers in a circular pattern. This system is common in flat areas of the United States.

Lateral move irrigation
Water is distributed through a series of pipes, each with a wheel and a set of sprinklers, which are rotated either by hand or with a purpose-built mechanism. The sprinklers move a CERTAIN distance across the field and then need to have the water hose reconnected for the next distance. This system tends to be less expensive but requires more labor than others.

Sub-irrigation
Water is distributed across land by raising the water table, through a system of pumping stations, canals, gates, and DITCHES. This type of irrigation is most effective in areas with high water tables.

Manual irrigation
Water is distributed across land through manual labor and watering cans. This system is very labor intensive.

For more INFORMATION on types of irrigation, visit the United States Geological Survey’s (USGS)

Let Tarun be x YEARS old
Mahesh=3x
4 YRS BACK Tarun=x-2
4 yrs back Mahesh=3x-2
3x-2=4(x-2)
3x-2=4x-8
3x-4x=-8+2
-x=-6
x=6
Therefore Tarun is 6 yrs old and Mahesh is 18 yrs old.

Chordates are coelomate and show an organ system level of organisation. They have the characteristicnotochord, DORSAL nerve cord, PHARYNGEAL SLITS. In this phylum, the nervous system is dorsal, hollow and SINGLE. The HEART is ventral, with a closed circulatory system.

There are SEVEN CHARACTER

accumulation of harmful chemicals can not be avoided but it can be reduced. it can be reduced by REDUCING the levels in the food chain.. for eg in a food chain like... plants-goat-humans..humans are at higher LEVEL so accumulation of chemicals will be more.. but if the food chain is like this... planrs-humans... here humans will have LESS accumulation of chemicals in their BODY.

Smallest CELL is mycoplasma
largest is OSTRICH egg
longest is neuron
IN HUMANS
sperm is smallest
ovum is largest

Hey mate.
Here is your answer-

a)ASSIMILATION of ENERGY from food.

Because combustion MEANS burning of SOMETHING. In assimilation it is also same.Food it burned by O2 to change food in glucose,energy and protein.

Hope it HELPS!!!!!!

Small pox is a very serious disease caused by the virus known as variola. The small pox obtains its name from pus-filled BLISTERS which occurs during the illness.

This disease is contagious so it might spread to others. The infected PERSON must STAY away from others contact.

It used to transmit from one person to another through SNEEZES, talks and COUGHS.

Title:

Monohybrid cross is defined as the TYPE of cross which is MADE between two parents that are differ from each other only in one HERITABLE characterstics. The hybrid obtained is CALLED monohybrid.

Explanation:

In monohybrid cross one TRAIT is dominant while the other is recessive and is not expressed in the next generation.

The ratio of monohybrid cross obtained in F2 generation is 3:1.

Brightfield microscopy is the CONVENTIONAL technique. It is suitable for observing the NATURAL colors of a specimen or the observation of stained samples. The specimen APPEARS darker on a bright background.

Darkfield microscopy shows the specimens bright on a dark background. Brightfield microscopes that have a condenser with a filter holder can be easily converted to darkfield by placing a patch stop filter into the filter holder. The specimens appear bright, because they reflect the LIGHT from the microscope into the OBJECTIVE.

hope this will help you!!!!

Economic importance
Sclerenchyma cells are the principal SUPPORTING cells in plant TISSUES that have ceased ELONGATION. Sclerenchyma fibers are of great economic importance, since they constitute the source material for MANY fabrics (e.g. [flax]) hemp, JUTE, and ramie)

Location
They don't have a permanent location. They are present in different parts of plants.

Structure
These cells are dead. They have different shapes and sizes but main two types occurs in sclereids and fibres.

Hey mate here is ur answer

Connective tissue is FOUND in between other tissues everywhere in the body, including the nervous SYSTEM. In the CENTRAL nervous system, the three outer membranes (the meninges) that envelop the brain and spinal cord are composed of connective tissue. They support and protect the body.

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MARK AS BRAINLIST

No REACTION will take PLACE as it is least REACTIVE metal and can't displace copper from its SOLUTION

a)the controlled breeding and rearing of FISH.
b)an installation or building in which the hatching of fish or poultry EGGS is artificially controlled for commercial purposes.
c)Swarming is the process by which a new honey bee COLONY is FORMED when the queen bee leaves the colony with a LARGE group of worker bees.

Menstruation means PERIOD OCCURRING in girls and it's PART of science and menstruation is RELATED to MATHEMATICS

Heya !!

Here is your answer..

Females have no role in determining gender of a child because of the sex CHROMOSOME.

Females have XX pair of chromosome while MALE have XY pair of chromosome.

The sex of the child TOTALLY depends upon the male.

And since FEMALE have no role in determining.

Hope it helps..

Phylum Porifera (Sponges) ...Phylum Coelenterata (Cnidaria) Corals & JELLYFISH. ...Phylum Ctenophora (Comb JELLIES) ...Phylum Platyhelminthes (FLATWORMS) ...Phylum Nemertea (Ribbon Worms) ...Phylum Rotifera (Rotifers) ...Phylum Gastrotricha (Gastrotrichs) ...Phylum Nematomorpha (Horsehair Worms)

All EUKARYOTIC cells have WITHIN them a VARIETY of different structures CALLED organelles.

Embryo transfer refers to a STEP in the process of assisted reproduction in which embryos are placed into the uterus of a female with the intent to establish a PREGNANCY. This technique (which is often used in connection with in vitro FERTILIZATION(IVF)), may be used in humans or in animals, in which situations the goals may vary.

Embryo transfer can be DONE at day two or day three, or later in the blastocyst stage, which was first PERFORMED in 1984.[1

When the CONCENTRATION of solution is higher than inside the cell. the water TEND to move inside the cell through OSMOSIS but it is moving TOWARDS inside the cell,so it is known as endosmosis

Carbon=6
hydrogen = 12
OXYGEN = 6

"A person after having LUNCH or dinner WANTS to pass urine because of (c) water content in the food MATERIAL.

All food materials come with nutrients and water content.

When the water content present in the food enters the blood, the required amount is absorbed and the unwanted is passed on to the kidneys for FORMATION of urine to be thrown out from the body.

"

ANSWER:

Caseinogen to casein.

Explanation:

Rennin is the ENZYME that acts as the endoaspartic peptidase. The newborn ruminant animals has this enzyme for the digestion of MILK. This enzyme is used in the production of cheese.

The rennin acts on the proteins present in the milk. The rennin converts caseinogen into insoluble casein. This casein is insoluble and curdle like in appearance. This HELPS in the precipitation of the milk and its substrate is K casein.

THUS, the correct answer is option (a).

"The correct option is (c) sponges.

Excretory SYSTEM has two main responsibilities. It maintains balance between WATER and salts and removes excess water and nitrogenous wastes from the body.

There are certain soft BODIED animals like sponges, COELENTERATES and echinoderms in which there are no special excretory organs.

The nitrogenous waste and water are removed from body SURFACE.

"

MENDEL alleles are responsible for the character. There are two types of alleles such as Homozygous and heterozygous alleles.

The homozygous alleles are the kind of same alleles that can be either RECESSIVE or dominant such as TT or tt WHEREAS heterozygous are recessive and dominant GENE such as Tt.

STEPS of construction:
1) Draw a line segment AB =3cm.
2) With B as center, construct an angle of 60° such that angle ZBA = 60°.
3) With B as center, draw an arc of RADIUS 5.5cm to cut off Z at C such that BC =5.5cm.
4) Join the points A and C.
The required triangle ABC is CONSTRUED.

Receptors are groups of SPECIALISED CELLS. They can detect changes in the ENVIRONMENT, which are CALLED stimuli, and turn them into electrical impulses.Receptors are often located in the sense ORGANS, such as the ear, eye and skin. Each organ has receptors sensitive to particular kinds of stimulus.