CBSE CLASS XI BIOLOGY QUESTION PAPER

CBSE BIOLOGY-PRACTICE PAPER BY MUKESH KUMAR

Subject: - BIOLOGY                                                                                                         Class – XI

Time: 3Hours                                                                                                              Max Marks:-70

GENERAL INSTRUCTIONS:

1.    All questions are compulsory.

2.    This question paper consists of four sections A,B,C and D. Section A contains 8 questions of 1mark each. Answer them in one word or one sentence. Section B has 10 questions of 2 marks each. Answer them in 30-40 words each. Section C has 9 questions of 3 marks each. Answer them in 40-50 words each. Section D has 3 questions of 5 marks each. Answer them in 80-120 words each.

3.    There is no overall choice. However an internal choice has been given in 1 question of 2 marks, one question of three marks, and all the 3 questions of 5 marks weightage. Attempt only one of the choices in such questions.

4.    Wherever necessary, the diagrams drawn should be neat and properly labeled.

Section A

1. What are plasmodesmata?                                                                                                                   

2. Name the alkaloid that inhibits cell division during metaphase stage.                            

3. Name the excretory organ of prawn.

4. Who proposed the fluid mosaic model of the cell membrane?

5. Expand PPLO                                                                                                                                 

 6. What is Go phase?

7. Lipids are not biomacromolecules why?

8. Which enzyme is found on the elementary particles?

Section B

9. What is enzymatic competitive inhibition? Give one example?

10. Enumerate the significance of mitosis?

11. What are the main functions of cell wall?

12. Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic. Why?

0R

Describe the blood vessels called vasa rectae found in relation to uriniferous tubules. What is their function?

13. Why can a red muscle fibre work for a prolonged period, while a white muscle fibre suffers from fatigue soon?

14. How are the two heart sounds produced during cardiac cycle? Which one of these is of longer duration?

15. How is respiration regulated?                                                                                                     16. What is the role of micelles in the fat absorption?

17. Give role of intercoastal  muscles in respiration.

18. Why are monosaccharide’s sugars are known as reducing sugars?

Section C

19. Write six differences between mitosis & meiosis?

20. Describe the structure of a typical eukaryotic chloroplast.

21. Describe the renal excretory system of man

22. Name three enzymes secreted by pancreas specify the substance and the product of each.

OR

Draw a labeled diagram of human alimentary canal & describe its different parts                     23. Explain sliding filament theory of muscle contraction.

24. Explain double circulation with the help of diagram.

25. Differentiate between three types of muscular tissue present in our body.

26. What is the role of carbonic anhydrase? Show by series of reactions how carbonic anhydrase starts the reactions leading to the formation of carbonic acid?

27. Differentiate between arteries and veins.

Section D

28. Name the five types of leucocytes and mention one function of each of them.

OR

Describe in detail how carbondioxide formed in an active tissue is transported to lungs.

29. Describe any five types of proteins with an example for each.

OR

Show diagrammatically the events in prophase -1and explain these stages.

30.i) Describe the structure of human heart.

ii) Draw a standard ECG and explain the different segments in it.

OR

a) How do liver and skin act as accessory excretory organs? Explain

b) Draw the diagram of a nephron and label its parts.