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Describe reproduction

Posted by Rounak Anand 5 years, 3 months ago

1 answers

Charu Gupta 5 years, 3 months ago

Reproduction is the process by which an living organism produce new individuals similar to themselves. It ensures continuity of life on earth.

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What is pyramid of numbers? Draw pyramid of numbers in case of grassland ecosystem. ??

Posted by Shubham Saxena ???? 5 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 2 months ago

A pyramid of numbers shows the total number of individual organisms at each level in the food chain of an ecosystem. An inverted pyramid of numbers can be found in an ecosystem where the community contains a few producers with a very large biomass that support a larger number of smaller consumers. In this, the energy is maximum at producer level, followed by primary consumer level (herbivores), followed by secondary consumer level (carnivores). The base of the pyramid of number represents the producers in a grassland ecosystem. Thus, the correct answer is 'Always upright.

Sl. No.	Differentiating Property	Resistance	Resistivity
1	Definition	Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons.	Resistivity is the physical property of a particular substance which is having particular dimensions.
2	Proportionality	Resistance is directly proportional to the length and temperature while it is inversely proportional to the cross-sectional area of the material.	Resistivity is only proportional to the nature and temperature of the particular material.
3	Symbol	R	ρ
4	Formula	R = V/I or, R = ρ(L/A)V = Voltage, I = Current, ρ = Resistivity	ρ = (R×A)/L R = Resistance, L= Length, A = Cross-sectional area
5	SI Units	The SI unit of resistance is Ohms	The SI unit of resistivity is Ohms-meter.

Saturated hydrocarbons	Unsaturated hydrocarbons
Saturated hydrocarbons are the compounds containing only single covalent bonds. These are also known as alkanes.	Unsaturated hydrocarbons are the straight chain compounds containing double or triple covalent bonds. Hydrocarbons with a double bond between carbon atoms are known as alkenes. Hydrocarbons with triple bonds between carbon atoms are known as alkynes.
These compounds have more number of hydrogen atoms when compared to its corresponding unsaturated hydrocarbons.	These compounds have less number of hydrogen atoms when compared to its corresponding unsaturated hydrocarbons.
These compounds are less reactive.	These compounds are more reactive.
These compounds under go substitution reactions. CH4 + Cl2 → CH3Cl + HCl	These compounds under go addition reactions. Ex: CH2=CH2 + H2 → CH3 - CH3
Saturated hydrocarbons burns with blue flame	Unsaturated hydrocarbons burns with sooty flame

Object placement	Image obtained	Image characteristics
When the object is placed at infinity	Image obtained is at the focal point	Image is a point
When the object is moved from infinity to center of curvature	Image move from focal point to center of curvature	The size of the image is increased, real, and inverted
When the object is at center of curvature	Image obtained is at center of curvature	The size of the image remains the same, real, and inverted
When the object move from center of curvature to focal point	Image move from center of curvature to infinity	The size of the image is bigger than the object, real, and inverted
When the object is at focal point	Image is at infinity	Infinitely big
When the object move from the focal point to mirror	Image move from minus infinity to mirror	The size of the image decreases, larger than the object, virtual, and upright

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