8th biology (English medium) (NEW)

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    Welcome to your 8th biology (English medium) (NEW)

    பெயர்
    மாவட்டம்
    மின்னஞ்சல்
    1. ……………. is absent in bacteria.

    2. ……………. is not a fungus.

    3. ……………. is not a shape seen in bacteria.

    4. ‘Grass of water’ refers to …………….

    5. ……………. is a biocontrol agent.

    6. Assertion (A) : Fungi are heterotrophic in nutrition. Reason (R) : They lack chlorophyll.

    7. Assertion (A) : Boiling milk is a method of preservation. Reason (R) : Probiotics is a method of preserving milk.

    8. E.coli is an example of ……………. bacteria.

    9. …………….. is an example for colonial form of algae.

    10. Floridean starch is a reserve food material of …………….

    11. Soil erosion is prevented by …………….. plants.

    12. The well – developed sporophytic plant body is seen in ……………..

    13. The first vascular cryptogams in land plants are …………….

    14. Binominal Nomenclature was first introduced in the year of ……………

    15. Penicillin is an antibiotic, which is extracted from

    16. Which of the following characters are not suitable to angiosperm? (a) Reticulate / parallel venation, closed seeded plants, sieve tubes are present in phloem. (b) Seeds are open, ovary is not present, gametes are produced in cones. (c) Tracheids are the conducting cells, companion cells not are present in phloem. (d) Trimerous or tetramerous, closed seed, seed with seed coat, bears fruit.

    17. Which of the following sequences are correct (a) In Bryophytes – Gametophytes – Sex organ – Gamete fusion – Zygote – Spore mother cell – spore – Thallus. (b) In Angiosperm – pollination – fertilization – zygote – new plant. (c) In Gymnosperm – male cone, and female cone – microspore and megaspore – Zygote – new sporophytes plant. (d) In pteridophytes – pollination by wind, fertilization in the presence of water – zygote prothallus, new plant.

    18. Assertion (A): Artificial system of classification is otherwise called sexual system of classification. Reason (R) : Artificial system of classification is based on the nature of the vegetative characters.

    19. ……………. is a blue green algae.

    20. ……………. is an edible algae.

    21. Classification of algae was given by …………….

    22. Tikka disease is seen in ……………..

    23. …………… is a hallucinogenic fungus.

    24. Maintenance of constant internal environment of the body is known as ………………

    25. ……………… cells are specialised cells that can be transformed into any kind of cells.

    26. Osmosis is the movement of water molecules from a ………………

    27. The erythrocyte is placed in ……………… solution which has lesser concentration of solutes and greater concentration of water than in the cytoplasm.

    28. Each glucose molecule produces ATP.

    29. …………….. of the eye is comparable to film of a camera.

    30. Assertion : Diffusion of molecules occurs through a semipermeable membrane. Reason : Molecules of gases are only involved in diffusion.

    31. ………………. is a transparent layer.

    32. Which of the following parts of our body help us in movement? (i) Bones (ii) Skin (iii) Muscles (iv) Organs

    33. The greatest range of movement is seen in ……………….. joint.

    34. The wrist bones are examples of ……………….. joint.

    35. The ……………….. is the strongest bone of human skeleton.

    36. Irregular bones are seen in ………………..

    37. ……………….. is not found in arm bone.

    38. The method in which water flows over the soil surface and allow it to infiltrate is ………………..

    39. …………… is a ornamental crop.

    40. Royal Botanical garden is located in ……………

    41. Wildlife Protection Act was implemented in …………….

    42. Bio – magnification is the increase in contaminated substances due to the intoxicating environment. The contaminants might be heavy metals such as mercury, arsenic, and pesticides such as polychlorinated biphenyls and DDT (Dichloro Diphenyl Trichloro ethane).

    43. According to WWF (World Wildlife Fund) there has been ......... decrease in the size of population of animals, birds, fish, reptiles and amphibians over the past 40 years.

    44. ......... is a technique of growing plant cells, tissues, organs, seeds or other plant parts in a sterile environment on a nutrient medium.

    45. International Code of Botanical Nomenclature. These are a set of International rules proposed by botanists to ensure a stable, universal and uniform system of naming plants.

    46. find out the wrong pair.

    47. Wildlife Protection Act was implemented in …………….

    48. Each year …………… is celebrated as ‘World Biodiversity Day’.

    49. Chipko Movement was started in ……………

    50. Gases methane and carbon dioxide accumulating in the atmosphere and trap the heat energy inside the atmosphere leading to increase in temperature is called Global warming.