CBSE Guess > Papers > Question Papers > Class XII > 2005 > Biology > Delhi Set-III

BIOLOGY 2005 (Set III—Delhi)

Except for the following questions all the remaining questions have been a, in Set I & Set II.

SECTION - A

Q. 1. What is Chemotaxis? 1

Q. 2. Mention two characteristics of a species that make it susceptible to extinction. 1
Q. 4. Name the respective secretions of Goblet cells and Parietal cells in human stomach. 1

Q. 5. What happens in lymphoid organs with respect to immunity? 1
SECTION - B

Q. 11. How does an isograft differ from an allograft? What does the success of allograft depend on? 2

Q. 14. What are the chemical changes in a pyruvic acid molecule, before it enters mitochondria? 2

SECTION - C

Q. 16. Name the category of bones forming the rib cage. How are these articulated to each other to form the cage? 3

Q. 18. Why is glomerular filtrate hypertonic and hypotonic in descending and ascending limb of loop of Henle respectively? What is the effect of ADH on collecting tubules? 3
SECTION - D

Q. 26. What is the basis of classifying cancer? Name and explain the different categories of cancer. Mention any two approaches for cancer treatment. 5
Or
What is embryo culture? What is the objective of this culture? Describe the three applications of this technique.

Q. 28. What is photophosphorylation? Explain the two ways of this mechanism
occurring in chloroplasts. 5
Or
Describe the process of progressive reduction of one molecule of nitrogen during nitrogen fixation in leguminous plants.