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 to develop an effective malaria vaccine?
A. Malaria is caused by several species of Plasmodium.
B. Man does not develop immunity to malaria during natural infection.
C. Vaccines can be developed only against bacteria.
D. Man is only an intermediate host and not the definitive host.
Answer : A.
2) With reference to the soil conservation, consider the following practices:
1. Crop relation
2. Sand fences
3. Terracing
4. Wind breaks
Which of the above are considered appropriate methods for soil conservation in India?
A. 1, 2 and 3 only
B. 2 and 4 only
C. 1, 3 and 4 only
D. 1, 2, 3 and 4
Answer : C.
3) Biodiversity forms the basis for human existence in the following ways:
1. Soil formation
2. Prevention of soil erosion
3. Recycling of waste4. Pollination of crops
A. 1, 2 and 3 only
B. 2, 3 and 4 only
C. 1 and 4 only
D. 1, 2, 3 and 4
Answer : D.
4) A gas used as a disinfectant in drinking water is
A. Hydrogen
B. Oxygen
C. Fluorine
D. Chlorine
Answer : D.
5) A genetically engineered form of brinjal, known as the Bt-brinjal, has been developed. The objective of this is
A. To make it pest-resistant
B. To improve its taste and nutritive qualities
C. To make it drought-resistant
D. To make its shelf-life longer
Answer : A.
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
A. O positive
B. A positive
C. B positive
D. Cannot be determined on the basis of the given data
Answer : A.
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?
1. DVD supports standard Definition video while BD supports High definition Video.
2. Compared to a DVD, the BD format has several times more storage capacity.
3. Thickness of BD is 2.4 mm while that of DVD is 1.2 mm.
Which of the statements given above is/are correct?
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2 and 3
Answer : B.
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?
A. Indian wild buffalo
B. Indian wild ass
C. Indian wild boar
D. Indian gazelle
Answer : B.
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?
A. 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
B. When aspartame is used in food processing, the sweet taste remains, but it becomes resistant to oxidation
C. Aspartame is as sweet as sugar, but after ingestion into the body, it is converted into metabolites that yield no calories
D. Aspartame is several times sweeter than table sugar, hence food items made with small quantities of aspartame yield fewer calories on oxidation
Answer : D.
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?
1. It is possible to know the pedigree of livestock.
2. It is possible to understand the causes of all human diseases.
3. It is possible to develop disease-resistant animal breeds.
Which of the statements given above is/are correct?
A. 1 and 2 only
B. 2 only
C. 1 and 3 only
D. 1, 2 and 3
Answer : D.
