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.
