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3351.

How twins are born?

Answer» When two zygotes are formed
3352.

What is RNA?

Answer» RNA (Ribonucleic acid) is a nucleic acid present in all living cells. Its principal role is to act as a messenger carrying instructions from DNA for controlling the synthesis of proteins, although in some viruses RNA rather than DNA carries the genetic information.Ribonucleic acid is a polymeric molecule essential in various biological roles in coding, decoding, regulation, and expression of genes.
3353.

Who many horizontal

Answer»
3354.

Theory of Mendeleev and limitations

Answer»
3355.

Who discovered proton and neutron

Answer» Rutherford and chadwick
3356.

what is a sonar..?

Answer» Sonar stands for Sound Navigation And Ranging
Sonar is a technique that uses sound propagation to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.It is a system for the detection of objects under water by emitting sound pulses and detecting or measuring their return after being reflected.
3357.

What is the Sl unit of magnetic field strength?

Answer» Magnetic field strength H is a physical quantity used as one of the basic measures of the intensity of magnetic field. The unit of magnetic field strength is ampere per metre or A/m.
Tesla
3358.

Caco3=cao+co2 oxidation and reduction

Answer»
3359.

What is ketones and nomenclature ? for example

Answer» The IUPAC system of nomenclature assigns a characteristic suffix of -one to ketones. A ketone carbonyl function may be located anywhere within a chain or ring, and its position is usually given by a location number. Chain numbering normally starts from the end nearest the carbonyl group. Very simple ketones, such as propanone and phenylethanone do not require a locator number, since there is only one possible site for a ketone carbonyl function. The common names for ketones are formed by naming both alkyl groups attached to the carbonyl then adding the suffix -ketone. The attached alkyl groups are arranged in the name alphabetically.\xa0Ketone Nomenclature rules:-Ketones take their name from their parent alkane chains. The ending -e is removed and replaced with -one.The common name for ketones are simply the substituent groups listed alphabetically + ketone.Some common ketones are known by their generic names. Such as the fact that propanone is commonly referred to as acetone.
Ketones are the functional group and it hasc=o and nomenclature mean the set of particular thing
3360.

Name a nonmetal

Answer» Sulphur
Oxygen .
3361.

Sin square theta + cos square theta

Answer»
3362.

What is the formula of methane?

Answer» CH4
3363.

What are the key features of speciation

Answer»
3364.

Soaps are formed by the saponification of

Answer» Glycrides is wrong fatty acid is rifht
Glycerides
3365.

Hello yar... no reply

Answer»
3366.

Why is the conversions of ethanol to ethanoic acid an oxidation reaction?

Answer»
3367.

Note on allotropes of carbon.

Answer»
3368.

Why carbon does not carry either ^+4 or ^-4 valency? Give 4 properties of carbon -

Answer»
3369.

Why are bubbles formed in the soap solution when hydrogen is passed through it

Answer» Due to Michelle formation
3370.

Advantages and limitation of tidal energy

Answer» It can not be prefer in low tides
3371.

Tetra valency means

Answer» Which has a valency of four, and is capable of making bonds with four other atoms of any other element
3372.

What is meant by isomers ?

Answer»
3373.

Iu effect of bio magnification

Answer»
3374.

Ph value of acid

Answer» 0 to 6.90 more acidic6.9 less acidic
7 above
3375.

What is a Aperture

Answer» Aperture of a mirror represents the size of the mirror
3376.

Explain genetics

Answer» The study that deals with genes
3377.

What is the formula for Ethanoic Acid

Answer» CH3 COOH
3378.

Define chromosomes.

Answer»
3379.

reaction of sodium hydroxide and cholesterol

Answer»
3380.

formula of sodium ethanol te.

Answer» CH3COONa
3381.

What is corolla

Answer» Group of petals
3382.

Ways to manage resources

Answer» Resources can be managed by conserving minimising uses and even using alternatives.
3383.

Which device is used to convert solar energy into heat.

Answer» Solar thermal collector
Solar cooker
3384.

Structure of the human eye

Answer»
3385.

Name one organism each having saprophytic, parasitic and holozoic modes of nutrition?

Answer»
3386.

Diameter of dna

Answer» Height-34\'A\'
3387.

Double fertilization

Answer»
3388.

What are contraceptive methods? Possible reasons for using by contraception by people?

Answer» Copper T,condoms, pills
This is given in the last page of this chapter
3389.

Two advantages of vegetative propogation

Answer» 1.Vegetative propagation is useful for plants those have lost the capacity to produce seeds, e.g.,banana,rose,etc.2. All plants produced are genetically similar to the parent plant.
3390.

Vegetative propogation with example

Answer» Accept flower the parts undergoes asexual reproduction example leaf stem roots etc ...
3391.

What is hydrogen molecule

Answer» H2
3392.

Fertilisation occurs once in a month . Comment.

Answer» Yes
3393.

What is ester

Answer» When we add ethanol and carboxylic acid together ester is formed
Sweet smelling substance
3394.

Blood bank of body

Answer» Spleen
3395.

Why does dry HCl gas not change the colour of dry blue litmus paper

Answer» No realse of H+ions
Because acid produces H+ ions in its aqueous solution only
3396.

Why does the atomic radius decrease on moving left to right along a period

Answer» Because nucleus hold it more tightly while moving towards left to right.
3397.

Precautions to show a slide of stomata

Answer» Do not put much water on glass slab, do not touch the plate,etc.
3398.

How will you test for the gas which is liberated when HCl reacts with an active metal.

Answer» By taking burning candle near it(Since the gas liberated is hydrogen it will burn with pop sound)
By using blue litmus paper the hydrogen release in this reaction is acidic in nature and paper turn into red
3399.

Colour of sun

Answer» White
White but by using a prism it forms a spectrum
3400.

Which is colour of sun

Answer»