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  • Question
  • What organelle allows some protists to detect light?


  • Correct Answer
  • An organelle called Eyespot allows some protists to detect light It allows the cells to sense light direction and intensity and respond to it by swimming either towards the light (positive phototaxis) or away from the light (negative phototaxis) Eyespot is a photoreceptive organelle found in the flagellate or (motile) cells of green algae and other unicellular photosynthetic organisms such as euglenids Eyespot-mediated light perception helps the cells in finding an environment with optimal light conditions for photosynthesis Eyespots are the simplest and most common "eyes" found in nature, composed of photoreceptors and areas of bright orange-red pigment granules 

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    • 1. Which best describes genetic mutations?

    • Options
    • A. Genetic mutations that cause diseases are always passed on to offspring.
    • B. Some inherited genetic mutations can be good for the offspring.
    • C. Different genetic mutations cause few forms of cancer.
    • D. Somatic mutations can be inherited from parents or acquired during life.
    • Discuss
    • 2. Name the two main types of Fermentation?
    • Discuss
    • 3. A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc x AaBbCc, the phenotypic ratio of the offsprings was observed as 1 : 6 : m : 20 : m : 6 : 1. What is the value of m?

    • Options
    • A. 10
    • B. 15
    • C. 18
    • D. 24
    • Discuss
    • 4. Where does glycolysis take place?

    • Options
    • A. Mitichondria
    • B. Cytoplasm
    • C. Mitochondrial outer membrane
    • D. None of above
    • Discuss
    • 5. Plant development is influenced by

    • Options
    • A. quality, quantity and duration of light
    • B. quality and duration of light
    • C. quality and quantity of light
    • D. quality of light only
    • Discuss
    • 6. Which of the following is not a function of cytoskeleton in a cell ?

    • Options
    • A. Maintenance of cell shape and structure
    • B. Intracellular transport
    • C. Cell motility
    • D. Support of the organelle
    • Discuss
    • 7. Which of the following is considered a modified stem?

    • Options
    • A. Tendril
    • B. Taproot
    • C. Petiole
    • D. Tuber
    • Discuss
    • 8. Which statement describes decomposers?

    • Options
    • A. Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems.
    • B. Decomposers can produce their own source of energy and can sometimes act as primary producers.
    • C. Decomposers are those organisms that recycle matter in the ecosystem..
    • D. All the above
    • Discuss
    • 9. Where in the cell are chromosomes located?

    • Options
    • A. mitochondria
    • B. DNA
    • C. RNA
    • D. Nucleus
    • Discuss
    • 10. The inherited traits of an organism are controlled by

    • Options
    • A. DNA
    • B. Enzymes
    • C. Nucleotides
    • D. RNA
    • Discuss


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