Question Discussion & Solution

Given: 40 × 20 ÷ 28 - 4 + 2

The logic follows here is: 

  
By inserting codes and then using BODMAS Rule:

40 + 20 - 28 ÷ 4 × 2

= 40 + 20 - 7 × 2

= 40 + 20 - 14 

= 60 - 14

= 46

Hence, 46 is the correct answer.

The correct answer is option 4, i.e Carbon.

• Carbon forms the maximum number of compounds in the periodic table.
• Since carbon has the property of tetra valency and catenation so they can form a maximum number of compounds.
• Carbon exists in several allotropic forms. Graphite and diamond are examples of allotropes of carbon that have different properties.
• The atomic number of carbon= 6. It lies in the 14th group in the periodic table.

The code for ‘IRONIC’ would be ‘#!?@#&’.

All are divisible by 10 except 25.

The correct answer is Wheat.

Key Points

Concept-

• A wide range of fungal, bacterial, and viral pathogens, affect the yield of cultivated crop species, especially in tropical climates.
• Crop losses can often be significant, up to 20-30 per cent, or sometimes even total.
• In this situation, the breeding and development of cultivars resistant to disease enhance food production.
• This also helps reduce the dependence on the use of fungicides and bacteriocides.

Explanation-

• Resistance of the host plant is the ability to prevent the pathogen from causing disease and is determined by the genetic constitution of the host plant.
• Before breeding is undertaken, it is important to know about the causative organism and the mode of transmission.
• Some of the diseases caused by-
  • Fungi are rusts, e.g., brown rust of wheat, red rot of sugarcane, and late blight of potato.
  • Bacteria – black rot of crucifers.
  • Viruses – tobacco mosaic, turnip mosaic, etc.
• Brown rust of wheat is caused by the fungus Puccinia triticina.

Therefore the brown rust is the disease of wheat.

Additional Information

• Red rot is the disease of sugarcane.
• Late blight is the disease of potatoes.
• Mosaic virus is the disease of turnip.