1).Widespread resistance of malarial parasite to drugs like chloroquine has prompted attempts to develop a malarial vaccine to combat malaria. Why is it difficult an effective malaria vaccine? [UPSC 2010 (CS-P)]
Malaria is caused by several species of Plasmodium.
Man does not develop immunity to malaria during natural infection.
Vaccines can be developed only against bacteria.
Man is only an intermediate host and not the definitive host.
2).
With reference to the soil conservation, consider the following practices:
- Crop relation
- Sand fences
- Terracing
- Wind breaks
Which of the above are considered appropriate methods for soil conservation in India? [UPSC 2010 (CS-P)]
1, 2 and 3 only
2 and 4 only
1, 3 and 4 only
1, 2, 3 and 4
3).
Biodiversity forms the basis for human existence in the following ways:
- Soil formation
- Prevention of soil erosion
- Recycling of waste
- Pollination of crops
Select the correct answer using the codes given below:[UPSC 2011 (CS-P)]
1, 2 and 3 only
2, 3 and 4 only
1 and 4 only
1, 2, 3 and 4
4).A gas used as a disinfectant in drinking water is [UPSC 2008]
Hydrogen
Oxygen
Fluorine
Chlorine
5).A genetically engineered form of brinjal, known as the Bt-brinjal, has been developed. The objective of this is [UPSC 2011 (CS-P)]
To make it pest-resistant
To improve its taste and nutritive qualities
To make it drought-resistant
To make its shelf-life longer
6).A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is [UPSC 2011 (CS-P)]
O positive
A positive
B positive
Cannot be determined on the basis of the given data
7).A new optical disc format known as the Blu-ray Disc (BD) is becoming popular. In what way is it different from the traditional DVD? [UPSC 2011 (CS-P)]
- DVD supports standard Definition video while BD supports High definition Video.
- Compared to a DVD, the BD format has several times more storage capacity.
- Thickness of BD is 2.4 mm while that of DVD is 1.2 mm.
Which of the statements given above is/are correct?
1 only
1 and 2 only
2 and 3 only
1, 2 and 3
8).A sandy and saline area is the natural habitat of an Indian animal species. The animal has no predators in that area but its existence is threatened due to the destruction of its habitat. Which one of the following could be that animal? [UPSC 2011 (CS-P)]
Indian wild buffalo
Indian wild ass
Indian wild boar
Indian gazelle
9).Aspartame is an artificial sweetener sold in the market. It consists of amino acids and provides calories like other amino acids. Yet, it is used as a low-calorie sweetening agent in food items. What is the basis of this use? [UPSC 2011 (CS-P)]
Aspartame is as sweet as table sugar, but unlike table sugar, it is not readily oxidized in human body due to lack of requisite enzymes
When aspartame is used in food processing, the sweet taste remains, but it becomes resistant to oxidation
Aspartame is as sweet as sugar, but after ingestion into the body, it is converted into metabolites that yield no calories
Aspartame is several times sweeter than table sugar, hence food items made with small quantities of aspartame yield fewer calories on oxidation
10).At present, scientists can determine the arrangement or relative positions of genes of DNA sequences on a chromosome. How does this knowledge benefit us? [UPSC 2011 (CS-P)]
- It is possible to know the pedigree of livestock.
- It is possible to understand the causes of all human diseases.
- It is possible to develop disease-resistant animal breeds.
Which of the statements given above is/are correct?
1 and 2 only
2 only
1 and 3 only
1, 2 and 3