CBSE 2014 12th board biology paper leaked is confirmed

IF THIS IS THE CONDITION OF CBSE BOARD THEN WHAT ARE YOU EXPECTING FROM OTHER STATE BOARDS. EXPECTEDLY THE MATHEMATICS CBSE BOARD PAPER WILL ALSO BE LEAKED 24 HRS BEFORE THE EXAM.

The manipur website which reported physics CBSE paper leakage is reportedly saying that CBSE biology paper is also leaked, the article on hueiyenlanpao reads

“AFTER CBSE AISSCE-2014 PHYSICS QUESTION LEAKAGE LEAKED HANDWRITTEN QUESTIONS” FOR BIOLOGY SCHEDULED FOR MARCH 15, 2014 ARE REPORTEDLY SOLD IN MANIPUR…

Hueiyen Lanpao has come across these questions, and we are uploading the questions on our website for the public to ascertain whether the same “leaked” questions for Biology are being asked in the examination tomorrow.

Our expose on leakage of Physics Question Paper has compelled CBSE to conduct retest for the said Physics paper in Manipur Centres on April 2, 2014.

The following are some of the questions for Biology taken up from the handwritten “leaked” question paper which is reportedly on sale in Manipur.

(5 Marks Questions)

Q1. (a) Write the specific features of the genetic code AUG.

(b) Genetic codes can be Universal and degenerate. Write about them, giving one example of each.

(c) Explain aminoacylation of the RNA

OR

(a) Differentiate between dominance and co-dominance.

(b) Explain co-dominance taking an example of human blood groups in the population.

Q2. Describe in sequence the events that lead to the development of a 3 -celled pollen grains from mocrispore mother cell in angiosperm.

OR

Explain about microsporogenesis.

Q3. Explain about double fertilization.

OR

Describe the sailent feature of the double helix structure of DNA

(3 marks questions)

1. What are the factors that affected human health?

2. What are the main steps in breeding a new genetic variety of crop?

3. Describe the structure of RNA polynucleotide chain having 4 different types of hucleotides.

4. Differentiate between a detrivore and a decomposer giving an example of each.

5. (a) Name the lymphoid organ in humans where all the blood cells are produced.

(b) Where do the lymphocytes produced by the lymphoid organ mentioned above migrate and how do they affect the immunity?

(2 marks questions)

1. Mention 2 significance of pedegree study?

2. Write the two chemical different between DNA and RNA?

3. State Hardy-Weinberg Principle. Write its algebraic equation.

4. Mention the site where syngamy occurs in amphibians and reptiles respectively.

5. Write the disadvantage for external ferfilisation.

6. How long do pollen grain retain viability? On what factors do they depend for their viability?

7. Describe the asexual and sexual phase of life cycle of plasmodium that causes Malaria in humans.

OR

a) What is Plant breeding ? List the two steps, the classical plant breeding involves.

b) How has the mutation breeding helped in improving crop varieties? Give one example where this technique has helped.

8. How do Darwin finches illustrate adaptive radiation.

(1 marks questions)

1. Offspring derived by asexual reproduction are called clones. Justify giving 2 xamples.

2. If the stamens are welled exposed usually. Which made of pollination the plants expected to follow.

3. Mention the function of Trophoblast in human embryo.

4. The meiocyte of an onion plant contains 32 chromosomes. Workout the number of chromosomes found in its endosperm.

5. Name the type of flower which favours cross-pollination.

6. Name the organism commercially used for the production of single cell protein (SCP).

7. Mention any two significant role of predration in nature.

8. What are ‘a’ and ‘b’ in the nucleotide with purine represented below?

diagram:

H

A   O   C

H

B

9. What is the significance of the process of RNA interference (RNAi) in eukaryotic organisms?

(Diagram)

1. Structure of Sperm

2.  Phenotypic = 3:1, Genotypic = 1:2:1

3.  Symbols used in the human pedegree analysis.

4. Polynucleotide chain

5. The Hershey – Chase experiment

6. Replicating Fork

7. Miller’s experiment

8. Enzyme – ECORT

9. Recombinant DNA Technology.”

- Source: hueiyenlanpao.com

DONT BE SURPRISED IF MATHS PAPER IS LEAKED TOO.