Question
Write Short note: Regeneration.
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Answer
In developed animals like wall lizard the process of regeneration is used to restore the lost parts like tail or limbs. As the reproductive system is one of the fullfledged system in the body, the process of regeneration cannot be called type of reproduction.
But some primitive organisms such as Plarfaria use this method for procreation. Planaria breaks up its body into two parts. Each part has the ability to develop the lost part by process of regeneration. This forms two new Planaria.
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Why is variation during reproduction beneficial to the species but not necessarily for the individual?
A metal salt $MX$ when exposed to light splits up to form metal $M$ and a gas $X_2.$ Metal M is used in making ornaments whereas gas $X_2$ is used in making bleaching powder. The salt $MX $ is itself used in black and white photography:
→- What do you think metal M is?
- What could be gas $X_2?$
- Name the metal salt $MX.$
- Name any two salt solutions which on mixing together can produce a precipitate of salt $MX.$
- What type of chemical reaction takes place when salt MX is exposed to light? Write the equation of the reaction?
Write a short note.
Specific heat capacity
Specific heat capacity
Generally the ionic compounds have high melting points.
A nuclear reaction is represented by the following equation:
$^{235}_{\ \ 92}\text{U}+{^{1}_{0}\text{n}}\rightarrow{^{139}_{\ \ 56}\text{Ba}}+{^{94}_{36}\text{Kr}}+\text{xc}+\text{E}$
→$^{235}_{\ \ 92}\text{U}+{^{1}_{0}\text{n}}\rightarrow{^{139}_{\ \ 56}\text{Ba}}+{^{94}_{36}\text{Kr}}+\text{xc}+\text{E}$
- Name the process represented by this equation and describe what takes place
- Identify the particle c and the number x of such particles produced in the reaction.
- What does E represent?
- Name one installation where the above nuclear reaction is utilised.
- What type of bomb is based on similar type of reaction?
A four carbons atoms containing neutral organic compound $X$ reacts with sodium metal to evolve a gas which burns with 'pop' sound. Another four carbon atoms containing carbon compound reacts with sodium hydrogen carbonate to evolve a gas which turns lime water milky. When compounds $X$ and $Y$ are heated together in the presence of a little of concentrated sulphuric acid, then a new compound $Z$ is formed.
→- What is compound $X?$ Also write its formula.
- What is compound $Y?$ Also write its formula.
- What is compound $Z?$ Also write its formula.
- What type of smell is given by compound $Z?$
- What is the general name of compounds like $Z?$
- What is the general name of the reaction which which takes place between $X$ and $Y$ to form $Z?$
(Cultural, agriculture, fire, brain, Cro-Magnon, Homo sapiens, Neanderthal)
Evolution of upright man continued in the direction of developing its ………. for the period of about 1 lakh years and meanwhile he discovered the ………. Brain of man, 50 thousand years ago had been sufficiently evolved to the extent that it could be considered as member of the species ………… Neanderthal man can be considered as the first example of wise-man. The ……….. man evolved about 50 thousand years ago and afterwards, this evolution had been faster than the earlier. About 10 thousand years ago, wise-man started to practise the ………. It started to rear the cattle-herds and established the cities. ………..development took place later.
Evolution of upright man continued in the direction of developing its ………. for the period of about 1 lakh years and meanwhile he discovered the ………. Brain of man, 50 thousand years ago had been sufficiently evolved to the extent that it could be considered as member of the species ………… Neanderthal man can be considered as the first example of wise-man. The ……….. man evolved about 50 thousand years ago and afterwards, this evolution had been faster than the earlier. About 10 thousand years ago, wise-man started to practise the ………. It started to rear the cattle-herds and established the cities. ………..development took place later.
X, Y, and Z are three animals. The animal X can fly but animal Y can only run on ground or walls. The forelimbs of animals X and Y have the same basic design but they are used for different purposes such as flying and running respectively. The animal Z became extinct an long time ago. The study of fossils of Z tells us that it had some features like those of X and some like those of Y. In fact, Z is said to form a connecting link in the evolutionary chain of X and Y.
- What could the animals X, Y and Z be?
- What name is given to the forelimbs like those of X and Y which have the same basic design but different functions?
- Name one feature in which Z resembled X.
- Name one feature in which Z resembled Y.
- Which is the correct evolutionary chain involving X, Y and Z : X → Z → Y or Y → Z → X?
If the height of a satellite completing one revolution around the earth in $T$ seconds is $h1$ meter, then what would be the height of a satellite taking $2 \sqrt{2}$. seconds for one revolution?
→During the respiration of an organism A, 1 molecule of glucose produces 2 ATP molecules whereas in the respiration of another organism B, 1 molecule of glucose produces 38 ATP molecules.
- Which organism is undergoing aerobic respiration?
- Which organism is undergoing anaerobic respiration?
- Which type of organism, A or B, can convert glucose into alcohol?
- Name one organism which behaves like A.
- Name two organisms which behave like B.