The steps required for the conversion of kitchen garbage into manure are given
below in a jumbled form.
A. Put the garbage in the pit.
B. Cover the bottom of the pit with sand.
C. Cover the pit loosely with grass or a gunny bag.
D. Add worms.
The correct sequence of these steps is

• B, A, C, D

• B, C, A, D

• B, A, D, C

• B, D, A, C

2.

Two organisms are best friends and live together. One provides shelter, water and nutrients while the other prepares and provides food. Such an association of organisms is termed as

• autotrophy

• parasitism

• heterotrophy

• symbiosis

In the alimentary canal, the swallowed food moves downwards because of

• the contraction of muscles in the wall of food pipe

• the flow of fluid material taken with the food

• gravitational pull

• force provided by the muscular tongue

Frogs and earthworms breathe through their skin because of which the skin of both the organisms is

• dry and rough

• dry and slimy

• moist and rough

• moist and slimy

While going for a picnic a student noted the reading on the odometer on the bus after every 10 min till the end of the journey. Later on, he recorded the reading in a table shown below

Time (am)	Odometer Reading
8:00	78752
8:10	78758
8:20	78768
8:30	78780
8:40	78791
8:50	78800
9:00	78806

The average speed of the bus in the entire journey (in m/s) was

• 15

• 18

• 30

• 54

You are provided with a concave mirror, a concave lens, a convex mirror and a convex lens. To obtain an enlarged image of an object you can use either

• concave lens or convex lens

• concave mirror or convex mirror

• concave mirror or concave lens

• concave mirror or convex lens

Select from the following a set of Kharif crops.

• Cotton, paddy, pea, linseed

• Paddy, maize, cotton, soyabean

• Gram, mustard, groundnut, wheat

• Maize, paddy, linseed, soyabean

Study the following statements about the effects of weeds on the crop plants
A. They help crop plants to grow healthily.
B. They interfere in harvesting.
C. They affect plant growth.
D. They compete with crop plants for water, nutrients, space, and light.

The correct statements are

• C and D

• Only D

• B, C, and D

• A, B and D

When we add aluminum foil to freshly prepared sodium hydroxide solution a gas is produced. Which of the following correctly states the property of this gas?

• Colourless and odourless gas which extinguishes a burning match stick

• Colourless and odourless gas which promotes burning of a candle

• Brown coloured pungent-smelling gas

• Colourless and odourless gas which produces a 'pop' sound when a burning match stick is brought near

Aqueous solution of which of the following oxides will change the colour of blue litmus to red?

• Copper oxide

• Iron oxide

• Magnesium oxide

• Sulphur dioxide