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Fill in the blanks with the most suitable options.
The Earth rotates on its axis once every (i) , leading to the (ii) cycle. The (iii) around the Sun, which takes nearly a year, causes the changing seasons due to the Earth’s axial tilt.

Select the pair of organisms that have different respiratory organs.

A Earthworm, Leech
B Cockroach, Grasshopper
C Shark, Whale
D Ostrich, Snake

Which object will cast the darkest shadow on the screen when light passes through?


A X
B Y
C Z
D All will cast the same shadow

A researcher studied the population of fishes, dragonflies, bees and plants in and around a pond. He added more fishes to the pond, what will he observe eventually?

A Increase in dragonflies population
B Increase in bees population
C Decrease in plant population
D Both (A) and (C)

Refer to the given word grid and answer the following questions.

Unscramble the words given in the box to find the names of means of mass communication. How many of them are hidden in the word grid?


A 4
B 2
C 3
D 5

Refer to the given word grid and answer the following questions.

Which of the following cannot be found in the word grid?

A Means of transport in the snowy mountainous regions.
B A vehicle once used by queens in olden days, still used by brides today.
C A vehicle running on tracks along city streets, still used in Kolkata for local transport.
D A traditional animal-pulled vehicle, used in rural areas.

Refer to the given diagram and select the correct statement.


A Gases can be compressed easily because their particles are far apart, leaving space for compression.
B Liquids can be compressed more easily than gases because their particles are less tightly packed.
C Solids can be compressed more easily than liquids or gases due to their closely packed particles.
D Gases can be compressed more easily than liquids because their particles are more tightly packed.

Read the given paragraph and answer the following questions.
Clinical thermometer is used to measure our body temperature. It consists of a long, narrow, uniform glass tube. Clinical thermometer has a bulb filled with mercury at one end. A constriction is provided, which does not allow mercury to fall back into the bulb.

S₁ : Clinical thermometer cannot be used to measure the temperature of melting ice.
S₂ : The range of clinical thermometer is from 35°C to 42°C.

A Both S₁ and S₂ are correct.
B S₁ is correct and S₂ is incorrect.
C Both S₁ and S₂ are incorrect.
D S₁ is incorrect and S₂ is correct.

Read the given paragraph where few words have been italicised and select the incorrect option regarding them.
Yeast is a multicellular microorganism belonging to the group fungi. During respiration, it releases oxygen which forms bubbles and makes the dough fluffy and a small amount of alcohol. Another bacterium, Lactobacillus feeds on the lactose present in milk to produce lactic acid. This process is known as fermentation and it turns milk into curd and occurs best in warm conditions.

A Multicellular should be replaced by unicellular and fungi should not be replaced as it is mentioned correctly.
B Oxygen should be replaced with carbon dioxide as it is mentioned incorrectly while alcohol should not be replaced.
C Lactobacillus should be replaced with Clostridium and lactic acid should be replaced with ethanol as they are mentioned incorrectly.
D Fermentation and warm should not be replaced as they are mentioned correctly.

Select the incorrect match.

A Ball and socket joint – Shoulder
B Hinge joint – Elbow
C Pivot joint – Wrist
D Gliding joint – Ankle