Sources of Energy — Science STD 10 — Question

What is the need of special tissues or organs for transport of substances in plants and animals?

What type of nutrition occurs in fungi?

Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.

Explain the formation of scum when hard water is treated with soap.

What happens when fertilization does not occur in a female body?

Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements.
Write an example of a compound formed with,

1. Chlorine (Group 17 of Periodic Table)
2. Oxgygen (Group 16 of Periodic Table)

Write the full forms of the following as they occur in biology:

1. STD.
2. AIDS .
3. HIV.

How would you distinguish experimentally between an alcohol and a carboxylic acid on the basis of a chemical property?

Draw ray diagrams showing the image formation by a convex mirror when an object is placed: At finite distance from the mirror.

Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction.