Management of Natural Resources — Science STD 10 — Question

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

Describe how fossil fuels were formed.

What happens when ethanol reacts with
i. sodium
ii. potassium permanganate solution.

When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates immediately with a brisk effervescence. Name this gas. Describe the method of testing this gas.

Define "Parasite" Name two saprophytes and two parasites.

A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate powder in a test tube. Name the gas and describe the test that confirms the identity of the gas.

What is the role of a plane mirror and a glass sheet in a solar cooker?

“A concave mirror of focal length ‘f’ can form a magnified erect as well as an inverted image of an object placed in front of it.” Justify this statement stating the position of the object with respect to the mirror in each case for obtaining these images.

A man can read the number of a distant bus clearly but he finds difficulty in reading a book.A man can read the number of a distant bus clearly but he finds difficulty in reading a book.

1. From which defect of the eye is he suffering?
2. What type of spectacle lens should he use to correct the defect?

The elements A, B and C belong to groups 1, 14 and 17 respectively of the periodic table.

1. Which two elements will form a covalent compound?
2. Which two elements will form an ionic compound?