Question

To observe the hydra bud clearly. Raju should see it first under the low power lens and then under the high power lens in order to see

• A. Less area
• B. Wide area
• C. More buds
• D. All of the above

Answer 1

The correct option is A Less area

The reproduction process in hydra is called as budding. It is observed by a compound microscope, which contains several types of lenses. Changing objectives from scanning power to lower power to high power results into some changes, like the size of the area decreases, the area of view become darker. The size of the image also increases. The resolution (ability to separate small details) increases, the working distance (distance between cover-slip and objective) decreases and the depth of the focus (thickness of the specimen seen in focus) is reduced. So, to observe the Hydra bud clearly, Raju should first see it under the low power lens and then under the high power lens, i.e. through a compound microscope in order to see less area and other earlier mentioned changes. Therefore, the correct option is A.