How do Organisms Reproduce? — Science STD 10 — Question

An electric bulb is connected to a 220V power supply line. If the bulb draws a current of 0.5A, calculate the power of the bulb.

Students were asked to observe the permanent slides showing different stages of budding in yeast under high power of a microscope.

1. Which adjustment screw (coarse/ fine) were you asked to move to focus the slides?
2. Draw three diagrams in correct sequence showing budding in yeast.

Draw labelled diagrams to illustrate budding in Hydra.

Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive:

1. Yellow seed
2. Round seed

What are the problems caused by the non-biodegradable wastes that we generate?

Give a test that can be used to differentiate chemically between butter and cooking oil.

Explain why, concave mirrors are used as shaving mirrors.

Give the general formula of an:

1. Alkane.
2. Alkene.
3. Alkyne.

To construct ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror. List these two rays and state the path of these rays after reflection. Use these rays to locate the image of an object placed between centres of curvature and focus of a concave mirror.

Draw in sequence (showing the four stages), the process of binary fission in Amoeba.