A student while observing an embryo of a pea seed in the laboratory listed various parts of the embryo as given below: On examining the list the teacher remarked that only three parts are correct. Select three correct parts from the following list:

For preparing soap in the laboratory we require an oil and a base. Which of the following combination of an oil and a base would be best suited for the preparation of soap?

In the neighborhood of your school, hard water required for an experiment is not available. Select from the following groups of salts available in your school, a group each member of which, if dissolved in distilled water, will make it hard:

If you are asked to select a group of two vegetables, out of the following, having homologous structures which one would you select?

To determine the approximate value of the focal length of a given concave mirror, you

focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always: