CHUKA MIKE

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When carbondioxide is bubbled into limewater a white precipitate is formed. If the passage of the gas is continued, the precipitate disappears. The reason for this is calcium carbonate is formed which on reaction with further carbondioxide forms solube calcium hydrogen carbonate.
When excess of carbon dioxide gas is passed through lime water then the white precipitate calcium carbonate formed first dissolves due to the formation of a soluble salt calcium hydrogen carbonate (Ca(HCO3)2, and the Solution becomes clear again.

Yes

Acids conduct electricity and are decomposed by the current, liberating hydrogen at the anode

The nitrogen gas obtained by burning an excess of phosphorus in air has a density higher than the nitrogen from nitrogen compounds because the nitrogen from air is contaminated with? RARE GASES

When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are; NITROGEN AND THE RARE GASES
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ALL METALS
OHM'S LAW: It states that the current through a conductor is directly proportional to the voltage (or potential difference) across it, and inversely proportional to its resistance (assuming that the temperature and other physical conditions do not change). Conductors that obey Ohm's law are made of metal, carbon and some alloys.
Any material, component, or device that obeys Ohm's law, where the current through the device is proportional to the voltage applied, is known as an ohmic material or ohmic component. Any material or component that does not obey Ohm's law is known as a nonohmic material or nonohmic component.
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11th
Chemistry
Classification of Elements and Periodicity in Properties
Trends in Chemical Properties
As we move from left to rig...
CHEMISTRY
As we move from left to right in a period, which of the periodic properties decreases?
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ANSWER
On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases. On moving from left to right in a period, the number of valence electrons increases from 1 to 8. On moving from left to right in a period, the atomic size decreases; the size of the atoms decreases. Since the atomic size decrease when we move from left to right in a period, therefore, electronegativity increases in moving left to right. Atomic size increases when moving down in a group thus electronegativity decreases when we move from top to bottom in the periodic table.

Metallic character decreases as you move across a period in the periodic table from left to right. This occurs as atoms more readily accept electrons to fill a valence shell than lose them to remove the unfilled shell.

ii and iv only

The glomerular filtrate contains water, glucose, salts, and urea, so the first option is wrong. The glucose, salts, and urea enter the Bowman's capsule in essentially the same concentrations as they have in the blood.
Filterable blood components include water, nitrogenous waste, and nutrients that will be transferred into the glomerulus to form the glomerular filtrate. Non-filterable blood components include blood cells, albumins, and platelets, that will leave the glomerulus through the efferent arteriole.

All the components of blood except plasma protein and cells is DEFINITELY CORRECT
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An accumulator in which the electrodes are made of lead and the electrolyte consists of dilute sulphuric acid. The electrodes are usually cast from a lead alloy containing 7–12% of antimony (to give increased hardness and corrosion resistance) and a small amount of tin (for better casting properties). The electrodes are coated with a paste of lead(II) oxide (PbO) and finely divided lead; after insertion into the electrolyte a ‘forming’ current is passed through the cell to convert the PbO on the negative plate into a sponge of finely divided lead. On the positive plate the PbO is converted to lead(IV) oxide (PbO2). The equation for the overall reaction during discharge is:PbO2+2H2SO4+Pb → 2PbSO4+2H2O The reaction is reversed during charging. Each cell gives an e.m.f. of about 2 volts and in motor vehicles a 12-volt battery of six cells is usually used. The lead-acid battery produces 80–120 kJ per kilogram. Compare nickel-iron accumulator.

PbO2+2H2SO4+Pb → 2PbSO4+2H2O

Lead-acid accumulator consists of Sulphuric Acid \( H_{2}SO_{4} \) as Electrolyte
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The thyroid attaches to the trachea via a consolidation of connective tissue, referred to as the lateral suspensory ligament or Berry's ligament. This ligament connects each of the thyroid lobes to the trachea.
The thyroid gland is located beside the trachea, just below the larynx. It has two lobes, which are flat and oval, one on each side of the trachea, joined by an isthmus across the front of the trachea. The thyroid isthmus lies about halfway between the thyroid cartilage (the Adam's apple) and the sternal notch.
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The appendix is a small, pouch-like sac of tissue that is located in the first part of the colon (cecum) in the lower- right abdomen. Lymphatic tissue in the appendix aids in immune function. The official name of the appendix is veriform appendix, which means "worm-like appendage." The appendix harbors bacteria.
The human appendix may be considered as a vestigial organ as it has been proved that the removal of the organ after infancy does not create any harm [1-3]. But the appendix has developed to the extreme in human and strategically placed to an important site at the junction of midgut and hindgut.

The nervous and endocrine systems both work to bring about this adaptation, but their response patterns are different. The nervous system and the endocrine system use chemical messengers to signal cells, but the speed at which these messages are transmitted and the length of their effects differs
The endocrine system secretes hormones into blood and other body fluids. These chemicals are important for metabolism, growth, water and mineral balance, and the response to stress. Hormones provide feedback to the brain to affect neural processing. Reproductive hormones affect the development of the nervous system.
INVOLVE THE USE OF CHEMICAL SUBSTANCES IS CORRECT
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PITITUARY GLAND

chemical co-ordination

involve the use of chemical substances

The pituitary gland is a small, bean-shaped gland situated at the base of your brain, somewhat behind your nose and between your ears. Despite its small size, the gland influences nearly every part of your body. The hormones it produces help regulate important functions, such as growth, blood pressure and reproduction

Along with the nervous system, the endocrine system coordinates the body's functions to maintain homeostasis during rest and exercise. The nervous and endocrine systems also work together to initiate and control movement, and all the physiological processes movement involves.

The gland that releases hormones into the blood are part of the endocrine system.
The endocrine system is a chemical messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs. In humans, the major endocrine glands...

The cerebellum receives information from the sensory systems, the spinal cord, and other parts of the brain and then regulates motor movements. The cerebellum coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity.
There are three functional areas of the cerebellum - the cerebrocerebellum, the spinocerebellum and the vestibulocerebellum. Cerebrocerebellum - the largest division, formed by the lateral hemispheres.
THE CEREBELLUM DEALS WITH MUSCULAR ACTIVITY
MUSCULAR ACTIVITY IS DEFINITELY CORRECT
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The mammalian endocrine system is responsible for chemical co-ordination
The Endocrine/Hormonal system coordinates Chemical Functions in the body by regulating Processes in the Human Bodyy.

Vertebrate Cardiovascular System | Back to Top
The vertebrate cardiovascular system includes a heart, which is a muscular pump that contracts to propel blood out to the body through arteries, and a series of blood vessels. The upper chamber of the heart, the atrium (pl. atria), is where the blood enters the heart. Passing through a valve, blood enters the lower chamber, the ventricle. Contraction of the ventricle forces blood from the heart through an artery. The heart muscle is composed of cardiac muscle cells.

Arteries are blood vessels that carry blood away from heart. Arterial walls are able to expand and contract. Arteries have three layers of thick walls. Smooth muscle fibers contract, another layer of connective tissue is quite elastic, allowing the arteries to carry blood under high pressure.

The aorta is the main artery leaving the heart. The pulmonary artery is the only artery that carries oxygen-poor blood. The pulmonary artery carries deoxygenated blood to the lungs. In the lungs, gas exchange occurs, carbon dioxide diffuses out, oxygen diffuses in. Arterioles are small arteries that connect larger arteries with capillaries. Small arterioles branch into collections of Capillaries. So The blood circulatory system of vertebrates consists of heart, arteries, capillaries and veins.
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A circulatory system that does not allow mixing of oxygenated and de-oxygenated blood in mammalian heart is referred to as CLOSED CIRCULATORY SYSTEM

Lymphocytes develop in the thymus and bone marrow (yellow), which are therefore called central (or primary) lymphoid organs. The newly formed lymphocytes migrate from these primary organs to peripheral (or secondary) lymphoid organs (more...)
Lymphocytes are bone marrow-derived cell lineages arising from a ... tissues, providing prompt release of cytokines that help to form the adaptive response.
The answer is Basophils
Basophils are not formed in bone marrow
LYMPHOCYTES IS CORRECT 100%

to detect finger prints

Rib: bone

calcium and phosphorus

Skeletal materials are organics primarily composed of varying percentages of hydroxyapatite and collagen, and can take the form of bone, antler, ivory, teeth, or horn. To first identify whether a material is skeletal, one must look for a porous surface, or unique shape.
Chitin is a skeletal material found in insects and anthropods. ... This skeletal material (chitin) is usually present outside the organism and this makes it an exoskeleton.
Cartilage
Bone

Gene–environment interaction is when two different genotypes respond to environmental variation in different ways. A norm of reaction is a graph that shows the relationship between genes and environmental factors when phenotypic differences are continuous.
The expression of genes in an organism can be influenced by the environment, including the external world in which the organism is located or develops, as well as the organism's internal world, which includes such factors as its hormones and metabolism.
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An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
An allele is one of two or more versions of a gene. An individual inherits two alleles for each gene, one from each parent.

The random way genes recombine during meiosis and fertilization leads to GENETIC VARIATION
A IS DEFINITELY CORRECT
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Characteristics of continuous variation include all of the following
1 Influenced by the environment

2 Occurs in a normal distribution curve

3 most of the organisms in the population fall at the tail ends of the range
Except Produced by many genes
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Mitochondrion is found in CYTOPLASM

The reproductive cells of crops are called GAMETES

The basis for growth and asexual reproduction is MITOSIS

The process which ensures that the chromosome number for each species of organism remain constant from generation to generation is called MEOSIS

there is distribution of a complete set of genes into each daughter cell

mutation of genes