Biology k

             1.  Which one among the following is not a good source of nutritional calcium?

      (a)    Rice   (b) Ragi  (c)  Skimmed  milk  (d)  egg

             2. At present scientists can determine the arrangement or relative position of genes or 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 cusses 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

(b)   Only 2

(c)    1 and 3

(d)   All of these

            3. Microbial fuel cells are considered a source of sustainable energy. Why?

1.       They use living organisms as catalyst to generate electricity from certain substrates.

2.       They use a variety of inorganic materials as substrates.

3.       They can be installed in waste water treatment plants to cleanse water and produce electricity.

Which of the statements give above is/ are correct?

(a)    Only 1

(b)   2 and 3

(c)    1 and 3

(d)   All of these

         4. 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⁺, B⁺ and O⁺.

The blood group of the adopted son is

(a)    O⁺    (b) A⁺  (c)   B⁺    (d)    cannot be determined on the basis of the given data

          5. Consider the following statements regarding antibiotics

1.       They are used to destroy disease –causing bacteria.

2.       They can be applied to the skin, swallowed or injected to fight microorganisms inside the body.

3.       They are effective against disease- causing viruses.

4.       The first antibiotic to be discovered was Tetracycline

Select the correct answer using the codes given below

(a)    1 and 2

(b)   1, 2 and 4

(c)    2, 3 and 4

(d)   Only 1

             6.  A genetically engineered from 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

              7.   Match the following

List I (Agent)	List II (disease)
A.      Arsenic       B.      Fluoride       C.      Dust        D.      noise	1.       Fluorosis         2.       Melanosis         3.       Presbyusis         4.       Silicosis

 Codes

(a)    3   1   4  2 

(b)   3   4   1   2

(c)    2  1   4   3

(d)   2   4   1  3

               8. A company marketing food products advertiss that its items do not contain trans-fats. What does this compaign signify to the customers?

1.       The food products are not made out of hydrogenated oil.

2.       The food products are not made out of animal fats/ oil.

3.       The oils used are not likely to damage the cardiovascular health of the consumers.

Which of the statements given above is/ are  correct?

(a)    Only 1

(b)   2 and 3

(c)    1 and 3

(d)   All of these

            9. government of India encourages the cultivation of ‘sea Buckthorn’. What is the importance of this plant?

1.       It h helps in controlling soil erosion and in preventing desertification.

2.       It is a rich source of biodiesel.

3.       It has nutritional value and is well- adapted in cold areas of high altitudes.

4.       Its timber is of great commercial value.

(a)    Only 1

(b)   2, 3 and 4

(c)    1 and 3

(d)   All of theses

          10.  Assertion (A) Autotroph plants contain the pigment chlorophyll for meeting their requirement of carbon and energy.

              Reason (R) photosynthesize is the process of converting water into food using sunlight and oxygen.

Answer:

1.       C

2.       D

3.       D

4.       D

5.       B

6.       A

7.       C

8.       D

9.       C

10.   C