An onion peel was taken and
a. Placed in salt solution for five minutes.
b. After that it was placed in distilled water.
When seen under the microscope what would be observed in a and b?

An onion peel was taken and Placed in salt solution for five minutes.

Take a plantlet of fenugreek, groundnut or any other bean and sterilize it with a 3 to 5% solution of hydrogen peroxide. Afterwards, keep it in a 70% solution of ethyl alcohol for 4 to 5 minutes. Clean the roots with sterile water and take thin sections of the root nodules. Select good section and place it in a solution of safranin for 2 to 3 minutes. Place the stained section on a glass slide, cover it with a coverslip and observe it under the compound microscope.

Activity 2 : Bring the active dry yeast powder from market . Take 50ml lukewarm water in a conical flask. Add 5gm of active dry yeast powder and 10 gm table sugar to that water andmix the mixture well. Keep the flask in warm place and after an hour take a drop of that mixture on a clean glass slide. Put a cover-glass on that drop and observe it under the compound microscope.

Suppose you accidentally find an old preserved permanent slide without a lable. In you effort to identify it, you place the slide under microscope and observe the following features: Unicellular Well defined nucleus Biflagellate one flagellum lying longlitudinally and the other transversely. What would you identify it as? Can you name the kingdom it belongs to?

As shown in the figure, place an onion on each gas jar in such a way that its base (roots) will remain dipped in water. Measure and record the length of the roots of both onions on the first, second and third day. On the fourth day, cut off 1 cm of the roots of the onion in flask B Measure the length of the roots of both onions for the next five days and record table. Why did the roots of the onion in jar B stop growing?

Arnav dissolves small amount of A' to a beaker containing water and observes that the solution temperature increases. What type of process takes place when 'A' ls added to water, based on temperature change?

As shown in the figure, place an onion on each gas jar in such a way that its base (roots) will remain dipped in water. Measure and record the length of the roots of both onions on the first, second and third day. On the fourth day, cut off 1 cm of the roots of the onion in flask B Measure the length of the roots of both onions for the next five days and record table. Which onion has longer roots? Why?

A conducting circular loop is placed in a uniform magnetic field B = 0.025 T with its place perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mms^-1 . What is the induced e.m.f. when the radius is 2cm?

Places A and B are 30 km apart and they are on a straight road.Hamid travels from A to B on bike. At the same time Joseph starts from B on bike and travels towards A. They meet each other after 20 minutes. If Joseph would have started from B at the same time but in the opposite direction (instead of towards A), Hamid would have caught up with him after 3 hours. Find the speed of Hamid and Joseph.

Choose the correct alternative and write it along with its allotted alphabet: When two plane mirrors are kept such that the angle between their reflecting surfaces is ........ and a small object is placed in between, seven images of the object are seen. A. 60^@ B. 90^@ C. 45^@ D. 36^@