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DELHI PUBLIC SCHOOL, DULIAJAN
1st Terminal Examination, 2010-11
Class: XI Time: 3 hrs
Subject: Biology Marks: 70
Section-A (1X8=8)
1. Give the scientific name of mango.
2. Name two phyla of animals that show radial symmetry.
3. Both gymnosperms and angiosperms bear seeds, then why are they classified separately
4. Why are animals of phylum Platyhelminthes known as flatworms
5. What is valvate aestivation
6. What is pulvinus
7. Name the two types of cells that generally constitutes mesophyll in a dicot plant.
8. Write the key difference between striated muscle and non-striated muscle.

SECTION-B (2X10=20)
9. What is binomial nomenclature Give an example and explain.
10. Mention four distinguishing features of kingdom monera.
11. How does isogamous reproduction differ from anisogamous reproduction
12. What is meant by internal fertilization Give two examples of animals that show internal fertilization.
13. Show diagrammatically an epigynous flower.
Or
Draw a longitudinal section of a mango fruit. Label three parts in its wall. What type of fruit is it
14. Wrire the floral formula of an acinomorphic, bisexual, hypogynous flower with five united sepals, five free stamens and two united carpels with superior ovary and axile placentation.
15. Differentiate between fibrous root and adventitious root.
16. Cut the transverse section of young stem of a plant from your school garden and observe it under microscope. How would you ascertain whether it is a monocot stem or a dicot stem
17. What are bulliform cells What is their function
18. Mention the scientific name of earthworm. What is the function of prostomium in earthworm

SECTION-C (3 X 9 = 27)
19. What is a museum How are the specimens preserved here
20. Draw a well defined diagram of a bacteriophage.
Or
Give a well labeled diagram of filamentous blue – green algae.
21. Represent schematically the haplo-diplontic life cycle.
22. Bring out four differences and two similarities between Mollusca and Arthropoda.
23. Justify the following statements on the basis of external features.
i) Underground parts of a plant are not always root.
ii) Flower is a modified shoot.
24. i) Why a large number of stomata are present at the lower surface of the lower surfaces of the dicotyledonous leaves in the terrestrial plants
ii) Why are xylem and phloem called complex tissues
25. Cork cambium forms tissues that forms the cork. Do you agree with this statement Explain.
26. What is the periderm How does periderm formation takes place in the dicot stems
27. How is a pinnately compound leaf different from palmately compound leaf

SECTION-D (5 X 3 = 15)
28. Give a brief outline of the classification of animals mentioning levels of organization, symmetry, body cavity, and phylum.
Or
What are triploblastic animals Represent digrammatically this condition. Name two nonchordata phyla that represent triploblastic condition.
29. i) In which segments of the earthworm is the typhosole present
ii) Mention its function.
iii) Name the 3 types of nephridium present in the earthworm and mention the segments in which they are located.
Or
Describe the morphology of earthworm.
30. Name the different mouthparts of cockroach and write the functions of each mouthpart.
Or
Draw the mouthparts of the cockroach neatly, also label them correctly.