Latest syllabus question and answers for class XII at Owlgen

Answer in biology

How did an American Company, Eli Lilly use the knowledge of r-DNA technology to produce human insulin?

Course: class XII.

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1 answers

The structure of insulin consists of two short polypeptide chains chain A and chain B linked together by disulphide bridges. In mammals, including human beings, insulin is synthesized as a pro-hormone which contains an extra stretch called the C p... See more

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Answer in physics

Draw a labeled diagram of an a.c generator. Explain briefly its principle and working.

Course: class XII.

4K views
1 answers

Principle: It works on the principle of Faraday’s law of electromagnetic induction. Whenever a coil is rotated in a uniform magnetic field about an axis perpendicular to the field, the magnetic flux linked with coil changes and an induced emf is se... See more

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Answer in physics

Explain with the help of a labelled diagram the underlying principle and working of a step- up transformer. Why cannot such a device be used to step – up d.c voltage?

Course: class XII.

1K views
1 answers

Principle: It is a device which converts high voltage AC into low voltage AC and vice-versa. It is based upon the principle of mutual induction. When alternating current is passed through a coil, an induced emf is set up in the neigh... See more

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Answer in biology

How do snails, seeds, bears, zoo-planktons, fungi and bacteria adapt to conditions unfavorable for their survival?

Course: class XII.

325 views
1 answers

Adaptations in unfavorable conditions in the following organisms: Snails: Snails undergo aestivation to avoid summer-related problems such as heat and desiccation. Seeds: Th... See more

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Answer in biology

Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.

Course: class XII.

810 views
1 answers

Follicle-stimulating hormone (FSH) and luteinising hormone are pituitary hormones. Oestrogen and progesterone are ovarian hormones. Functions of pituitary and ovarian hormones: FSH Stimulates ... See more

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Answer in biology

Why are thalassemia and haemophilia categorized as Mendelian disorders? Write the symptoms of these diseases. Explain their pattern of inheritance in humans.

Course: class XII.

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1 answers

Thalassaemia and haemophilia are categorized as Mendelian disorders because these are determined by alternation or mutation in a single gene. Symptoms of thalassaemia: The main symptoms of thalassaemia are anaemia, jaundi... See more

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Answer in biology

How do m-RNA, t-RNA and ribosomes help in the process of translation?

Course: class XII.

225 views
1 answers

Role of m-RNA, t-RNA and ribosomes in protein synthesis: m-RNA: The messenger RNA brings coded information from DNA and takes part in its translation by bringing amino acids in a particular sequence dur... See more

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Answer in physics

Explain, with the help of a schematic diagram, the principle and working of a Light Emitting Diode. What criterion is kept in mind while choosing the semiconductor material for such a device?

Write any two advantages of Light Emitting Diode over conventional incandescent lamps.

Course: class XII.

394 views
1 answers

A light emitting diode is simply a forward biased p-n junction, which emits light when energized [img alt_text='Metalised Contact' description='']https://s3.amazonaws.com/www.owlgen.com/wp-content/uploads/2017/08/27164840/MetalisedContact.png[/img... See more

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Answer in biology

It is often said that the pyramid of energy is always upright. On the other hand, the pyramid of biomass can be both upright and inverted. Explain with the help if examples and sketches.

Course: class XII.

2K views
1 answers

Pyramid of energy is a graphical representation of amount of accumulated energy per unit area in different trophic levels of a food chain. An energy pyramid is always upright because there is a gradual decrease in energy at successive trophic level... See more

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Answer in economics

What is excess demand? Explain the role of Reverse Repo Rate in removing it.

Course: class XII.

1K views
1 answers

Excess demand: It refers to the situation when aggregate demand is in excess of aggregate supply corresponding to full employment. It leads to reduction in inventories and inflation in the economy. Role of reverse repo rate: It is the rate at which c... See more

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Answer in economics

Explain how the Government can use the budgetary policy in reducing inequalities in income.

Course: class XII.

1K views
1 answers

Budgetary policy in reducing inequalities in incomes: Fiscal policy implies the income and expenditure policy or the budgetary policy of the Government. It is a branch of public finance which deals with the types of financial statem... See more

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Answer in economics

Giving reason explain how the following should be treated in estimation of national income:

Payment of interest by a firm to a bank Payment of interest by a bank to an individual Payment of …

Course: class XII.

638 views
1 answers

Estimation of national income: Payment of interest by a firm to a bank: It should be included while estimating the national income because a firm takes a loan for productive purpose. Payment of interest by a ... See more

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Answer in economics

What is deficient demand? Explain the role of Bank rate in removing it.

Course: class XII.

1K views
1 answers

Deficient demand: It refers to a situation when aggregate demand is short of aggregate supply corresponding to full employment in the economy. It leads to a fall in general price level and results in deflation. AD < AS Role of bank rate: The rate ... See more

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Answer in biology

Explain the different ways apomictic seeds can develop.

Course: class XII.

986 views
1 answers

Apomixis is a mode of reproduction which does not involve formation of zygote through gametic fusion. The two common ones are recurrent agamospermy and adventive embryony. Recurrent Agamospermy: Agamospermy is the formation of see... See more

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Answer in biology

Where does fertilization occur in humans? Explain the events that occur during this process.

Course: class XII.

2K views
1 answers

Fertilization in humans occurs in fallopian tube of the female reproductive system. It is the process of fusion of a haploid sperm and a haploid ovum to form a diploid zygote. The process of fertilization is completed under the following major steps:... See more

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List of Q & A for class XII.

How did an American Company, Eli Lilly use the knowledge of r-DNA technology to produce human insulin?

Draw a labeled diagram of an a.c generator. Explain briefly its principle and working.

Explain with the help of a labelled diagram the underlying principle and working of a step- up transformer. Why cannot such a device be used to step – up d.c voltage?

How do snails, seeds, bears, zoo-planktons, fungi and bacteria adapt to conditions unfavorable for their survival?

Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.

Why are thalassemia and haemophilia categorized as Mendelian disorders? Write the symptoms of these diseases. Explain their pattern of inheritance in humans.

How do m-RNA, t-RNA and ribosomes help in the process of translation?

Explain, with the help of a schematic diagram, the principle and working of a Light Emitting Diode. What criterion is kept in mind while choosing the semiconductor material for such a device?

It is often said that the pyramid of energy is always upright. On the other hand, the pyramid of biomass can be both upright and inverted. Explain with the help if examples and sketches.

What is excess demand? Explain the role of Reverse Repo Rate in removing it.

Explain how the Government can use the budgetary policy in reducing inequalities in income.

Giving reason explain how the following should be treated in estimation of national income:

What is deficient demand? Explain the role of Bank rate in removing it.

Explain the different ways apomictic seeds can develop.

Where does fertilization occur in humans? Explain the events that occur during this process.

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