Question Discussion & Solution

Concept:

• Heat Transfer: Heat is transferred from one place to another in substance due to temperature difference. 

• Evaporation: In this process, the liquid form a substance tends to convert in the gaseous phase on the uppermost surface due to heat and pressure.
• Condensation: In this process, the gaseous phase of an object tends to convert into liquid form due to pressure and temperature.

Explanation:

The other end of a wooden spoon will not become cold when it is dipped in a cup of ice cream because wood is a bad conductor, not a good conductor.

Fawn is young one of deer.

Similarly, Larvae are young one of insect.

The correct answer is Angiosperm.

Key Points

• Angiosperms are also known as Angiospermae or Magnoliophyta.
  • They are flowering and seed-producing plants.
  • It consists of 64 orders, 416 families, approximately 13,000 known genera, and 3,00,000 known species.
  • Their seeds develop in the ovaries of flowers and are surrounded by a protective fruit.
  • Examples of angiosperms are fruits, vegetables, grains, and flowers.
  • Angiosperms are classified as Monocotyledons (monocots) and Dicotyledons (dicots) where monocots are flowering plants whose seeds contain only one embryonic leaf or cotyledon and dicots are flowering plants whose seeds contain two embryonic leaves or cotyledons.

Additional Information

• Thallophyta
  • The plant body is not differentiated from roots, stems, and leaves.
  • They are commonly called algae.
• Bryophyta
  • These are small terrestrial plants.
  • They show differentiation in the body design, with stem, leaf-like structures, and root-like structures.

The correct answer is Barmer - Jalore.

Key Points

• Barmer-Jalore are major bajra producing districts.

Additional Information 

The Correct Answer is Option 1 i.e Baking powder.

• Baking powder:
  • Baking powder is a mixture of baking soda and tartaric acid .
  • Tartaric acid has been added to baking powder to neutralize the bitterness produced by sodium bicarbonate (NaHCO₃) .
• Baking soda:
  • It is commonly known as sodium bicarbonate.
  • Sodium bicarbonate is a white crystalline solid.
  • It is used in baking products like cakes, cookies etc.
• Washing Soda:
  • It is commonly known as Na2CO3 or sodium carbonate.
  • It is used in softening of hard water.
  • It is commonly used as a cleaning agent for domestic purposes.It is also used in the manufacturing of paper, soap, textiles, paints, etc.
• Vinegar:
  • Vinegar is produced from fermentation of alcohol.
  • Vinegar is the natural source for acetic acid.
  • It is widely used as a flavouring agent in most of the cuisines.