Planaria can be cut into any number of pieces and each piece grows into a complete organism. This process is called regeneration. Regeneration is carried out by specialised cells. When a Planaria is cut into three pieces, each of its pieces grow into separate individual; specialized cells proliferatRead more
Planaria can be cut into any number of pieces and each piece grows into a complete organism. This process is called regeneration. Regeneration is carried out by specialised cells.
When a Planaria is cut into three pieces, each of its pieces grow into separate individual; specialized cells proliferate; mass of cells get differentiated into various cells and tissues.
Another example of an organism showing the characteristics is Hydra. Diagram:
• Isomers: Compounds which have same molecular formula and different structural formula. • In first three members of alkane series, branching is not possible, therefore isomers are not possible. • Two isomers of butane C4H10.
• Isomers: Compounds which have same molecular formula and different structural formula.
• In first three members of alkane series, branching is not possible, therefore isomers are not possible.
• Two isomers of butane C4H10.
f= -10cm (since the image is formed at the focus) Now u= - 20cm, i,e. the candle flame is at C Therefore, the image would form at C and would be of the same size. Ray diagram :
f= -10cm (since the image is formed at the focus)
Now u= – 20cm, i,e. the candle flame is at C
Therefore, the image would form at C and would be of the same size. Ray diagram :
1) Facial Hair Growth: One primary secondary sexual characteristic that differs between males and females is the growth of facial hair. During puberty, males typically experience an increase in the thickness and distribution of facial hair, including the development of a beard and mustache. This isRead more
1) Facial Hair Growth:
One primary secondary sexual characteristic that differs between males and females is the growth of facial hair. During puberty, males typically experience an increase in the thickness and distribution of facial hair, including the development of a beard and mustache. This is driven by the influence of androgens, such as testosterone.
2) Adam’s Apple:
Another secondary sexual characteristic that distinguishes males from females is the Adam’s apple. The Adam’s apple, or laryngeal prominence, is a noticeable protrusion in the throat area, specifically in the front of the larynx. It becomes more prominent during puberty in males due to the growth of the laryngeal cartilage, which is influenced by the increase in testosterone levels. Females also have a laryngeal prominence, but it is generally less prominent than in males.
A concave lens has a focal length of 50 cm. Calculate its power.
Where f is the focal length of the lens.
Where f is the focal length of the lens.
See lessExplain with the help of labelled diagrams the development that takes place in each of the body parts of a Planaria where body is cut into three pieces. None this process and give an example of an organism in which a similar process can be observed.
Planaria can be cut into any number of pieces and each piece grows into a complete organism. This process is called regeneration. Regeneration is carried out by specialised cells. When a Planaria is cut into three pieces, each of its pieces grow into separate individual; specialized cells proliferatRead more
Planaria can be cut into any number of pieces and each piece grows into a complete organism. This process is called regeneration. Regeneration is carried out by specialised cells.
When a Planaria is cut into three pieces, each of its pieces grow into separate individual; specialized cells proliferate; mass of cells get differentiated into various cells and tissues.
See lessAnother example of an organism showing the characteristics is Hydra. Diagram:
An organic compound ‘X’ is a liquid at room temperature. It is also a very good solvent and has the molecular formula C2 H6 O. on oxidation ‘X’ gives ‘Y’ which give, break effervescence on reacting with NaHCO3. X reacts with Y in the presence of conc.H2SO4to give another compound ‘Z’ which has a pleasant smell. Identify X, Y and Z. Also write chemical equations to show the formation of Y and Z.
X- Ethanol C2H5OH Y- Ethanoic acid CH3COOH Z- Ester CH3COOC2H5
X- Ethanol C2H5OH
See lessY- Ethanoic acid CH3COOH
Z- Ester CH3COOC2H5
What are isomers? “Isomers of the first three members of alkane series are not possible”. Give reason to justify this statement and draw structures of two isomers of butane, C4 H10.
• Isomers: Compounds which have same molecular formula and different structural formula. • In first three members of alkane series, branching is not possible, therefore isomers are not possible. • Two isomers of butane C4H10.
• Isomers: Compounds which have same molecular formula and different structural formula.
See less• In first three members of alkane series, branching is not possible, therefore isomers are not possible.
• Two isomers of butane C4H10.
When a concave mirror is placed facing Sunlight, the Sun’s rays or sun light converge to a point 10 cm from the mirror. Now, if you place 2 cm long candles flame 20 cm away on the principal axis of the mirror, where would you specify a place a screen to obtain the image of the candle? What would see the size of a image? Draw a ray diagram to justify your answer.
f= -10cm (since the image is formed at the focus) Now u= - 20cm, i,e. the candle flame is at C Therefore, the image would form at C and would be of the same size. Ray diagram :
f= -10cm (since the image is formed at the focus)
See lessNow u= – 20cm, i,e. the candle flame is at C
Therefore, the image would form at C and would be of the same size. Ray diagram :
List two secondary sexual characters of males that are different from that of females.
1) Facial Hair Growth: One primary secondary sexual characteristic that differs between males and females is the growth of facial hair. During puberty, males typically experience an increase in the thickness and distribution of facial hair, including the development of a beard and mustache. This isRead more
1) Facial Hair Growth:
One primary secondary sexual characteristic that differs between males and females is the growth of facial hair. During puberty, males typically experience an increase in the thickness and distribution of facial hair, including the development of a beard and mustache. This is driven by the influence of androgens, such as testosterone.
2) Adam’s Apple:
Another secondary sexual characteristic that distinguishes males from females is the Adam’s apple. The Adam’s apple, or laryngeal prominence, is a noticeable protrusion in the throat area, specifically in the front of the larynx. It becomes more prominent during puberty in males due to the growth of the laryngeal cartilage, which is influenced by the increase in testosterone levels. Females also have a laryngeal prominence, but it is generally less prominent than in males.
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