CBSE Board Biology Class XI | Sample Paper -1 |


CBSE Board Biology Class XI | Sample Paper -1 |


Time: 3 hour

Subject- Biology M.M.-80

All questions are compulsory.

  1. Distinguish between intracellular and extracellular digestion. 1
  2. Write the name and type of excretory organs of Earthworm. 1
  3. Expand PPLO. 1
  4. Give main differences between nucleosides and nucleotides. 1
  5. Differentiate staminate and pistillate flower. 1
  6. Define diploblastic and triploblastic organisms with one example of each.                                                                                                 2
  7. What is marsupium ? Give an example in which it is found. 2
  8. Mention the four main features which all chordates have. 2
  9. Why is the earthworm called the friend of farmers? 2
  10. Explain the annual ring made during secondory growth in dicote stem.                                                                                                 2
  11. Name the following symbol-                                                                    2
  12. Who discovered mitochondria? Why is it called power house of cell?                                                                                                 2
  13. Draw a labeled diagram of nucleus of a plant cell . 2
  14. What are tendon and ligament? What are their function ? 2
  15. Write the floral formula of pea flower and onion flower. 2
  16. Mention the phylum of the following animals-                                    3
  • hydra               iii-leech                        v-pila
  • sycon                iv-human                    vi-planeria
  1. Name tissue /cell in which the followings are found           3
  • dendrites       iii-chondrin                 v-red bone marrow
  • ostreocyte        iv-elastin fibres          vi-cell wall.
  1. Differentiate between bone and cartilage. 3
  2. Draw a labeled diagram of digestive system of frog.           3


Explain the hypogynous and epigynous flower with diagram.


  1. What are lipids and their structural components ? Mention the func tions of lipids. 3
  2. Describe the primary structure of protein. 3


Write the structural formula of hexose sugar { glucose , fructose }.

  1. Explain the vascular bundles found in stems with proper diagram.        3
  2. What is placentation? Draw a clear sketch of axial and parietal placentation.                                                                                                 3
  3. Match the columns A and B.           3

A                                               B

  • i- Cristae                                    Interphase
  • ii- Centriole                          blue green algae
  • iii- Crocodile                           mitochondria
  • iv- S-phase                                animal cell
  • v- Clitellum                                     reptile
  • vi- Prokaryotic cell                   earthworm
  1. Explain the structure of striated muscles with suitable diagram. 3
  2. How many types of plastids are found in plant cells ? Explain the structure and function of a plastid which have chlorophyll. 5


A germ cell of an organism has two pairs chromosoms. Diagramatically represent the different phases of meiosis first.

  1. Draw a well labeled diagram of the mouth of parts of cockroach and mention function of each. 5


Describe the anatomical structure of dicot stem with T.S.diagram.

  1. Who discovered virus? Draw a sketch of bacteriophage virus and differentiate between virus and viroids. 5


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