Important question paper - 3 mark

11th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 45

    Part A

    Answer any 15 of the following question

    35 x 3 = 105
  1. What are Corolloid roots?  

  2. What is the contribution of prof. Birbal Sahni? 

  3. Mention three salient features of Brown algae.

  4. The term 'form genera' is used to name fossil plants - Explain.

  5. Describe the structure of pteridophytes.

  6. Describe sporangium of pteridophytes.

  7. Discuss the various types of Protostele.

  8. Write about secondary growth of gymnosperms.

  9. Compare gymnosperms and angiosperms.

  10. Where can we see cryophytic & halophytic algae? Give example.

  11. List out the various types of vegetative reproduction seen in algae.

  12. List out the various asexual spores produced by algae.

  13. Write any three differences between chlorophyceae and phaeophyceae members?

  14. How the vascular plants dominate the Earth?

  15. Explain the types of placentation with examples.

  16. Differentiate between aggregate fruit with multiple fruit.

  17. Draw and label the parts of types of aestivation.

  18. Describe the characters of Androecium with diagram.

  19. Provide the characteristics of multiple or composite fruit.

  20. Point out the functions of fruit.

  21. Provide the significance of seeds.

  22. Distinguish between Monoecious & Dioecious.

  23. Explain Bilateral symmetry.

  24. Differentiate Apopetalous from Sympetalous.

  25. Suggest why arteries close to the heart have more elastic fibres in their walls than arteries further away from the heart?

  26. When blood volume drops down abruptly, what happens to the stroke volume? State whether it increases or decreases?

  27. Ramu was 45 years old when he went to a doctor to check his blood pressure. His pressure was around 158/98mmHg. The doctor advised him to measure his blood pressure at home for two weeks. He came to the doctor saying his average -blood pressure was around 160/100mmHg. Doctor concludes that Ramu has high blood pressure or hypertension. If not controlled, hypertension can lead to heart failure, stroke and kidney failure. He returned to the doctor after two months after taking the drug, ACH inhibitor. This chemical blocks the production of angiotensin II, a powerful vasoconstrictor, so his blood pressure returned back to normal.
    1. Why are people with high blood pressure at greater risk for having a hemorrhagic stroke?
    2. Without medication Ramu's blood pressure was around 160/100mmHg after two weeks. Why this pressure was referred to as hypertension by the doctor.
    3. Blocking the action of vasoconstrictor lower the blood pressure? Give reasons.
    4. What is the role of ACH inhibitor in reducing blood pressure?
    5. What conditions one might expect if the blood pressure is not controlled?

  28. Explain the regulation of cardiac activity.

  29. Arrange the following structures in the order that a drop of water entering the nephron would encounter them
    (a) Afferent arteriole 
    (b) Bowman's capsule 
    (c) Collecting duct 
    (d) Distal tubule 
    (e) Glomerulus 
    (f) Loop of Henle 
    (g) Proximal tubule
    (h) Renal pelvis

  30. Which segment is the site of secretion and regulated reabsorption of ions and pH homeostasis?

  31. What solute is normally present in the body to estimate GFR in humans?

  32. Which part of the autonomic nervous system is involved in micturation process?

  33. Draw a L.S. of Kidney and label
    (a) Ureter, (b) Capsule, (c) Pelvis

  34. What is plasticity?

  35. Write the physiological effects of Cytokinins.

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