Latest syllabus question and answers for class XII at Owlgen

Answer in history

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What are the causes of poverty in India.

Course: class XII.

Poverty in India is a social phenomena and is perpetuated by extreme socio-economic inequalities. The basic economic factor responsible for the poverty remains highly skewed distribution of economic resources. The political factor such as the control... More

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Answer in biology

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

Course: class XII.

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... More

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Answer in physics

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

Course: class XII.

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... More

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Answer in physics

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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.

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... More

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Answer in biology

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

Course: class XII.

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

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Answer in biology

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

Course: class XII.

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

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Answer in biology

3K Views 1 Answer

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.

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... More

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Answer in biology

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

Course: class XII.

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... More

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Answer in physics

2K Views 1 Answer

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.

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... More

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Answer in biology

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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.

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... More

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List of Q & A for class XII.

What are the causes of poverty in India.

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.

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