Biology Delhi (Set 1)

General Instructions:

Read the following instructions very carefully and strictly follow them:

1. Question paper comprises five sections – A, B, C, D and E.
2. There are 27 questions in the question paper. All questions are compulsory.
3. Section A question number 1 to 5 are multiple choice questions, carrying one mark each.
4. Section B question number 6 to 12 are short answer questions type-I, carrying two marks each.
5. Section C question number 13 to 21 are short answer questions type-II, carrying three marks each.
6. Section D question number 22 to 24 are short answer questions type-III, carrying three marks each.
7. Section E question number 25 to 27 are long answer questions, carrying five marks each.
8. Answer should be brief and to the point also the above word limit be adhered to as far as possible.

1. There is no overall choice in the question paper. However, an internal choice has

been provided in two questions of 1 mark, one question of 2 marks, two questions of 3 marks and three questions of 5 marks questions. Only one of the choices in such questions have to be attempted.

1. The diagram drawn should be neat proportionate and properly labelled, wherever necessary.
2. In addition to this, separate instructions are given with each section and question, wherever necessary.

Question 1

Which one of the following part of the plant when put into the soil is likely to produce new offspring?

1. Part of an internode
2. A stem cutting with a node
3. Part of a primary root
4. A flower

Solution:

The new plantlet grows from the nodes present in the stem of the flowering plants.

Hence, the correct answer is option B.

Question 2

In a bacterium when RNA-polymerase binds to the promoter on a transcription unit during transcription, it

1. terminates the process
2. helps remove introns
3. initiates the process
4. inactivates the exons

Solution:

RNA polymerase is the key enzyme for the process of transcription. This enzyme recognizes the promoter region and initiates the transcription process. This leads to the formation of RNA (or mRNA) from the template DNA.

Hence, the correct answer is option C.

Question 3

The hypothesis that "Life originated from pre-existing non-living organic molecules was proposed by

1. Oparin and Haldane
2. Louis Pasteur
3. S.L. Miller
4. Hugo de Vries

Solution:

The hypothesis that "Life originated from pre-existing non-living organic molecules was proposed by Oparin and Haldane.

Hence, the correct answer is option A.

Question 4

Mating of a superior male of a breed of a cattle to a superior female of another breed is called

1. in breeding
2. out crossing
3. out breeding
4. cross breeding

OR