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| 6551. |
Renin Angiotensin mechanism |
| Answer» Renin Angiotensin mechanism | |
| 6552. |
How do you prepare your own herbarium sheets? What are the different tools you carry with you while collecting plants for the preparation of a herbarium? What information should a preserved plant material on the herbarium sheet provide for taxonomical studies? |
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Answer» How do you prepare your own herbarium sheets? What are the different tools you carry with you while collecting plants for the preparation of a herbarium? What information should a preserved plant material on the herbarium sheet provide for taxonomical studies? |
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| 6553. |
Read the text below and summarise it.Green SaharaThe Great Desert Where Hippos Once WallowedThe Sahara sets a standard for dry land. It’s the world’s largest desert. Relative humidity can drop into the low single digits. There are places where it rains only about once a century. There are people who reach the end of their lives without ever seeing water come from the sky.Yet beneath the Sahara are vast aquifers of fresh water, enough liquid to fill a small sea. It is fossil water, a treasure laid down in prehistoric times, some of it possibly a million years old. Just 6,000 years ago, the Sahara was a much different place.It was green. Prehistoric rock art in the Sahara shows something surprising: hippopotamuses, which need year-round water.“We don’t have much evidence of a tropical paradise out there, but we had something perfectly liveable,” says Jennifer Smith, a geologist at Washington University in St Louis.The green Sahara was the product of the migration of the paleo-monsoon. In the same way that ice ages come and go, so too do monsoons migrate north and south. The dynamics of earth’s motion are responsible. The tilt of the earth’s axis varies in a regular cycle — sometimes the planet is more tilted towards the sun, sometimes less so. The axis also wobbles like a spinning top. The date of the earth’s perihelion — its closest approach to the sun — varies in cycle as well.At times when the Northern Hemisphere tilts sharply towards the sun and the planet makes its closest approach, the increased blast of sunlight during the north’s summer months can cause the African monsoon (which currently occurs between the Equator and roughly 17°N latitude) to shift to the north as it did 10,000 years ago, inundating North Africa.Around 5,000 years ago the monsoon shifted dramatically southward again. The prehistoric inhabitants of the Sahara discovered that their relatively green surroundings were undergoing something worse than a drought (and perhaps they migrated towards the Nile Valley, where Egyptian culture began to flourish at around the same time).“We’re learning, and only in recent years, that some climate changes in the past have been as rapid as anything underway today,” says Robert Giegengack, a University of Pennsylvania geologist.As the land dried out and vegetation decreased, the soil lost its ability to hold water when it did rain. Fewer clouds formed from evaporation. When it rained, the water washed away and evaporated quickly. There was a kind of runaway drying effect. By 4,000 years ago the Sahara had become what it is today.No one knows how human-driven climate change may alter the Sahara in the future. It’s something scientists can ponder while sipping bottled fossil water pumped from underground.“It’s the best water in Egypt,” Giegengack said — clean, refreshing mineral water. If you want to drink something good, try the ancient buried treasure of the Sahara.JOEL ACHENBACKStaff Writer, Washington Post |
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Answer» Read the text below and summarise it. Green Sahara The Great Desert Where Hippos Once Wallowed The Sahara sets a standard for dry land. It’s the world’s largest desert. Relative humidity can drop into the low single digits. There are places where it rains only about once a century. There are people who reach the end of their lives without ever seeing water come from the sky. Yet beneath the Sahara are vast aquifers of fresh water, enough liquid to fill a small sea. It is fossil water, a treasure laid down in prehistoric times, some of it possibly a million years old. Just 6,000 years ago, the Sahara was a much different place. It was green. Prehistoric rock art in the Sahara shows something surprising: hippopotamuses, which need year-round water. “We don’t have much evidence of a tropical paradise out there, but we had something perfectly liveable,” says Jennifer Smith, a geologist at Washington University in St Louis. The green Sahara was the product of the migration of the paleo-monsoon. In the same way that ice ages come and go, so too do monsoons migrate north and south. The dynamics of earth’s motion are responsible. The tilt of the earth’s axis varies in a regular cycle — sometimes the planet is more tilted towards the sun, sometimes less so. The axis also wobbles like a spinning top. The date of the earth’s perihelion — its closest approach to the sun — varies in cycle as well. At times when the Northern Hemisphere tilts sharply towards the sun and the planet makes its closest approach, the increased blast of sunlight during the north’s summer months can cause the African monsoon (which currently occurs between the Equator and roughly 17°N latitude) to shift to the north as it did 10,000 years ago, inundating North Africa. Around 5,000 years ago the monsoon shifted dramatically southward again. The prehistoric inhabitants of the Sahara discovered that their relatively green surroundings were undergoing something worse than a drought (and perhaps they migrated towards the Nile Valley, where Egyptian culture began to flourish at around the same time). “We’re learning, and only in recent years, that some climate changes in the past have been as rapid as anything underway today,” says Robert Giegengack, a University of Pennsylvania geologist. As the land dried out and vegetation decreased, the soil lost its ability to hold water when it did rain. Fewer clouds formed from evaporation. When it rained, the water washed away and evaporated quickly. There was a kind of runaway drying effect. By 4,000 years ago the Sahara had become what it is today. No one knows how human-driven climate change may alter the Sahara in the future. It’s something scientists can ponder while sipping bottled fossil water pumped from underground. “It’s the best water in Egypt,” Giegengack said — clean, refreshing mineral water. If you want to drink something good, try the ancient buried treasure of the Sahara. JOEL ACHENBACK
Staff Writer, Washington Post |
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| 6554. |
Question 35Why did Mendel choose pea plant for his experiments? |
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Answer» Question 35 |
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| 6555. |
Find the sequence of binding of the following aminoacyl tRNA complexes during translation to mRNA transcribed by a DNA segment having the base sequences 3’TACATGGGTCCG 5’. Choose the answer showing the correct order of alphabets. |
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Answer» Find the sequence of binding of the following aminoacyl tRNA complexes during translation to mRNA transcribed by a DNA segment having the base sequences 3’TACATGGGTCCG 5’. Choose the answer showing the correct order of alphabets. |
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| 6556. |
Which of the following hormones play a role during ovulation and menstrual cycle? |
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Answer» Which of the following hormones play a role during ovulation and menstrual cycle? |
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| 6557. |
Regarding the assertion and reason, choose the correct option.Assertion [A]: Inhabitants close to busy airports are likely to experience health hazards.Reason [R]: Sound levels of jet planes usually exceed 150 dB. |
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Answer» Regarding the assertion and reason, choose the correct option. Assertion [A]: Inhabitants close to busy airports are likely to experience health hazards. Reason [R]: Sound levels of jet planes usually exceed 150 dB. |
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| 6558. |
Question 33Why is immune system essential for our health? |
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Answer» Question 33 |
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| 6559. |
Which of the following is known as the waste disposal system of the cell? |
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Answer» Which of the following is known as the waste disposal system of the cell? |
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| 6560. |
Answers the following questions in your own words.a. What is meant by ‘chromosome’. Explain its types.b. Describe the structure of the DNA molecule.c. Express your opinion about the use of DNA fingerprinting.d. Explain the structure, function and types of RNA.e. Why is it necessary for people to have their blood examined before marriage? |
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Answer» Answers the following questions in your own words. a. What is meant by ‘chromosome’. Explain its types. b. Describe the structure of the DNA molecule. c. Express your opinion about the use of DNA fingerprinting. d. Explain the structure, function and types of RNA. e. Why is it necessary for people to have their blood examined before marriage?
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| 6561. |
Do you think the poet advocates total inactivity and death? |
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Answer» Do you think the poet advocates total inactivity and death? |
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| 6562. |
Question 4What are the major divisions in the Plantae? What is the basis for these divisions? |
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Answer» Question 4 |
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| 6563. |
Which of the following statements is true? |
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Answer» Which of the following statements is true? |
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| 6564. |
Question 7 (i)Name the following:(i) A parasitic plant with yellow, slender and tubular stem. |
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Answer» Question 7 (i) |
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| 6565. |
A process which makes an important difference between C3 and C4 plants is |
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Answer» A process which makes an important difference between C3 and C4 plants is |
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| 6566. |
Match the spinal nerves mentioned in column I with the number listed in column II and select the right answer containing the correct matching of the alphabets of the two columnsColumn I-Column -IISpinal nervesNumberALumber nervese1 pairBCervical nervesf12 pairsCThoracic nervesg8 pairs h5 pairs |
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Answer» Match the spinal nerves mentioned in column I with the number listed in column II and select the right answer containing the correct matching of the alphabets of the two columns Column I-Column -IISpinal nervesNumberALumber nervese1 pairBCervical nervesf12 pairsCThoracic nervesg8 pairs h5 pairs |
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| 6567. |
A species may be reproductively isolated through which of the following causes? |
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Answer» A species may be reproductively isolated through which of the following causes? |
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| 6568. |
Agarose extracted from sea weeds finds use in |
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Answer» Agarose extracted from sea weeds finds use in |
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| 6569. |
In ecosystem, the insectivorous plants are placed in |
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Answer» In ecosystem, the insectivorous plants are placed in |
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| 6570. |
State the products of the following reaction:- (1) (CH_3)_3C-OC_2H_5 \xrightarrow{HI |
| Answer» State the products of the following reaction:- (1) (CH_3)_3C-OC_2H_5 \xrightarrow{HI | |
| 6571. |
Which of the following hormone is not produced by the pituitary gland? |
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Answer» Which of the following hormone is not produced by the pituitary gland? |
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| 6572. |
B2 is more stable than F2 then also bond length of B2 is greater than F2. Why? |
| Answer» B2 is more stable than F2 then also bond length of B2 is greater than F2. Why? | |
| 6573. |
Comparable to Angiosperms, which of the following algae exhibits diplontic life cycle? |
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Answer» Comparable to Angiosperms, which of the following algae exhibits diplontic life cycle? |
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| 6574. |
3.What is pitch blende? |
| Answer» 3.What is pitch blende? | |
| 6575. |
"It is our moral and social responsibility to work hard for sustainable development." Do you agree? If yes, what should be done to achieve the objective of sustainable development? |
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Answer» "It is our moral and social responsibility to work hard for sustainable development." Do you agree? If yes, what should be done to achieve the objective of sustainable development? |
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| 6576. |
Enzyme which can break and seal the DNA strand |
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Answer» Enzyme which can break and seal the DNA strand |
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| 6577. |
Question 39 Six turns of Calvin cycle are required to generate one mole of glucose. Explain. |
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Answer» Question 39 |
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| 6578. |
How does the arching of the stolon take place? |
| Answer» How does the arching of the stolon take place? | |
| 6579. |
Identify the correct dental formula of a human child from the options below |
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Answer» Identify the correct dental formula of a human child from the options below |
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| 6580. |
Explain what ball and socket joint is and mention where it is present. |
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Answer» Explain what ball and socket joint is and mention where it is present. |
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| 6581. |
what is neutrino ? |
| Answer» what is neutrino ? | |
| 6582. |
Q2. (a) What are the different constituents of air?(b) Which is the most abundant gas present in the air? Give the relative abundance of the oxygen gas present in the air. |
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Answer» Q2. (a) What are the different constituents of air? (b) Which is the most abundant gas present in the air? Give the relative abundance of the oxygen gas present in the air. |
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| 6583. |
How many of above reactions are correct? |
Answer»     How many of above reactions are correct? |
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| 6584. |
Among the following graphs, the number of graphs which represent variation of x/m with temprature(T) for adsorption is |
Answer» Among the following graphs, the number of graphs which represent variation of x/m with temprature(T) for adsorption is |
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| 6585. |
What are the different structures of proteins? Explain them |
| Answer» What are the different structures of proteins? Explain them | |
| 6586. |
In the flowering plants, food is transported in the form of ........................... (sucrose, glucose, starch). |
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Answer» In the flowering plants, food is transported in the form of ........................... (sucrose, glucose, starch). |
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| 6587. |
Transverse binary fission occurs in |
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Answer» Transverse binary fission occurs in |
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| 6588. |
Distinguishanaphase of mitosis from anaphase Iofmeiosis. |
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Answer» Distinguish |
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| 6589. |
Which of the following correctly points out the difference between microsporogenesis and megasporogenesis. |
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Answer» Which of the following correctly points out the difference between microsporogenesis and megasporogenesis. |
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| 6590. |
what is photosynthetic effect and net producting efficiency? |
| Answer» what is photosynthetic effect and net producting efficiency? | |
| 6591. |
Which of the following steps is taken to prevent the occurrence of erythroblastosis fetalis? |
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Answer» Which of the following steps is taken to prevent the occurrence of erythroblastosis fetalis? |
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| 6592. |
Which of these is not a general function of the kidney? |
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Answer» Which of these is not a general function of the kidney? |
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| 6593. |
The most common simple tissue present in all plants is: |
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Answer»
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| 6594. |
Which phylum is the most abundant one among animals? |
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Answer» Which phylum is the most abundant one among animals? |
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| 6595. |
Mendelian recombinations are mainly due to ___. |
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Answer» Mendelian recombinations are mainly due to ___. |
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| 6596. |
During muscular contraction, which of the following events occur? (i) H – zone disappears (ii) A band widens (iii) I – band reduces in width (iv) Width of A band is unaffected (v) M line and Z line come closer |
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Answer» During muscular contraction, which of the following events occur? (i) H – zone disappears (ii) A band widens (iii) I – band reduces in width (iv) Width of A band is unaffected (v) M line and Z line come closer |
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| 6597. |
34. Secretin and cholecystokinin are digestivehormones. They are secreted in:iveive\lbrack AIPMT (Prelims)-2005(2) lleum(4) Pyloric stomach(1) Oesophagusingth 3) Duodenum |
| Answer» 34. Secretin and cholecystokinin are digestivehormones. They are secreted in:iveive\lbrack AIPMT (Prelims)-2005(2) lleum(4) Pyloric stomach(1) Oesophagusingth 3) Duodenum | |
| 6598. |
What scenario does the following image explain? I. Trees black due to II. Trees in the forest light industrialization colored |
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Answer» What scenario does the following image explain?
I. Trees black due to II. Trees in the forest light industrialization colored |
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| 6599. |
Which of the following carbohydrates are branched polymer of glucose? |
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Answer» Which of the following carbohydrates are branched polymer of glucose? |
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| 6600. |
The conduction mechanism consists of three stages. Which of the following is the correct order of events during this process? |
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Answer» The conduction mechanism consists of three stages. Which of the following is the correct order of events during this process? |
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