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CBSE Important Questions

CBSE Guess > Papers > Important Questions > Class XI > 2013 > Biology By Mr. Sachin Prajapati

CBSE CLASS XI

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Biology

  1. What are Phanerogams? What is the other name for them?
  2. Why is the spleen known as blood bank?
  3. Which hormone is known as an immunosuppressive and a stress hormone?
  4. Name the enzyme secreted by the digestive system of a man to digest proteins in acidic and alkaline medium.
  5. What is fungi imperfecti? Give out line classification of kingdom fungi.
  6. Give the botanical name of a plant of family fabaceae. Show the floral formula and floral diagram of the same plant.
  7. Name any one cranial nerve that controls eye ball movement. Is this nerve a sensory, a motor or a mixed one?
  8. Describe the functions of the endoplasmic reticulum.
  9. What is synapse? Explain how nerve impulse is transmitted across a synapse?
  10. What is meant by biological nitrogen fixation? Explain the process of biological nitrogen fixation. Give role of leg-hemoglobin in nitrogen fixation.
  11. In most plants the terminal bud suppresses the development of nearby lateral buds. What is this phenomenon called as? Name the phytohormone that can promote this phenomenon.
  12. Name a gaseous plant hormone and mention its three different actions on plants.
  13. What are tidal volume and vital capacity?        
  14. Give the full form of ADH. Name the gland that secretes it. It is released under what condition of the body? What is its role in forming hypertonic urine? What is the disease caused due to the failure of its secretion?
  15.  Name and explain three phases of Calvin cycle. Where does this cycle takes place in  a cell.
  16. What are the two heart sounds? How are these sounds produced?
  17. Why right ventricular wall is thinner than the left ventricular wall?
  18. What is cork cambium? Give the name of a tissue formed by cork cambium.
  19. Draw a well labeled diagram of digestive system of an earthworm. What is the role of gizzard and typhlosole in digestive system of an earthworm?
  20. Describe the sequence of the events in meiosis I. What are the special events of homologous chromosomes during meiosis?
  21. What is the function of the mucus present in gastric juice?
  22. Nostoc and anabaena have specialized cells called hetrocysts. What is the function of these cells?
  23. How are bacteria classified on the basis of their shapes?
  24. Why red tides are caused and why are they harmful?
  25. When a fungus called coprophilous?
  26. Which group of plant is regarded as first terrestrial plant? Why?
  27. Roots in some Gymnosperms have fungal or algal association. Give examples their names and role in the plants.
  28. Draw the life cycle of an angiosperm along with a brief note on double fertilization.
  29. Why are corals important?
  30. What is the difference between class amphibian and class reptilian in respect of their skin?
  31. Differentiate between poikilothermous and homoithermous organisms.
  32. List the characteristic features of class mammalian.
  33. What are the features of class aves which help them in flying?
  34. Differentiate between chondrichthyes and osteichthyes.
  35. Which part of mango fruit is edible?
  36. State the main function of leaf tendril.
  37. Write the floral formula of family Liliaceae.
  38. The endosperm is formed as a result of double fertilization (Triple Fusion). What is its function?
  39. Name the type of root for the following :-
    1. Roots performing the function of photosynthesis.
    2. Roots come above the surface of the soil to absorb air.
    3. The pillar like roots developed from lateral branches for providing mechanical support.
  40. Explain the terms and their types with examples:-
    1. Aestivation
    2. Phyllotaxy
  41. Differentiate between :-
    1. Actinomorphic flower and Zygomorphic flower.
    2. Racemose inflorescence and cymose inflorescence.
  42. Name the tissue used for making ropes.
  43. Where the bulliform cells found in leaves?
  44. Which tissue of the leaf contains chloroplast?
  45. What are trichomes ? State their functions.
  46. Mention two special properties of nervous tissue.
  47. Name the cells present in adipose tissue.
  48. Name the cell responsible for clotting of blood.
  49. What ate endocrine glands?
  50. Differentiate between skeletal and smooth muscles

 

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Submitted By Mr. Sachin Prajapati
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