Question Discussion & Solution

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.

The Correct Answer is Cytokinin.

Key Points

• Cytokinins are a class of plant growth substances (phytohormones) that promote cell division or cytokinesis in plant roots and shoots.
• There are two types of Cytokinins: Adenine-type Cytokinins represented by Zeatin, Kinetin and 6-Benzylaminopurine and Phenylurea-type Cytokinins like Diphenylurea and Thidiazuron (TDZ).

Key Points 

• Auxins are a class of plant hormones with some morphogen-like characteristics. Auxins play a cardinal role in the coordination of many growths and behavioural processes in plant life cycles and are essential for plant body development.
• Abscisic acid is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure.
• Gibberellins are plant hormones that regulate various developmental processes, including stem elongation, dormancy, germination, flowering, flower development and leaf and fruit senescence.

 Additional Information 

The correct answer is 1878.

• Vernacular press act was passed in 1878.

Key Points

• The Vernacular Press Act, 1878 came to be known as the Gagging Act as it discriminated between the English and the Vernacular Press.
• Vernacular Press Act, in British India, the law enacted in 1878 to curtail the freedom of the Indian-language (i.e., non-English) press.
• Lord Lytton passed the Vernacular Press Act 1878.
•  He also passed the Arms Act 1878 that prohibited Indians from carrying weapons of any kind without licenses.

Additional Information

• Indian National Awakening was the prime motive of vernacular newspapers.
• The law was repealed in 1881 by Lytton’s successor, Lord Ripon.
• Provisions of the Vernacular Press Act, 1878 include :
  • The publisher had to deposit the security and in case of infringement of the provision of the act the security could be forfeited.
  • If the offence reoccurred, the press equipment could be seized.

Apple, strawberry and cherry all the fruits are in red colour while mango is a yellow colour fruit.

The correct answer is A thin layer of silicon.

Key Points

• In computers, the chip is made up of a thin layer of silicon.
  • Computer chips are made of silicon, which is a semiconductor, and in order to make the most efficient use of it, chip manufacturers use sand that contains as much silicon as possible.
  • The mineral quartz is ideal for this purpose because its two main components are silicon and oxygen.
  • Silicon is used because it can be used as either an insulator (doesn't allow electricity to flow) or a semiconductor (allows a little flow of electricity).
  • This is important for making chips.
  • It is very, very cheap.
• Hence, option 2 is correct. 

Additional Information

• Silicon is used for electronic devices because it is an element with very special properties.
  • One of its most important properties is that it is a semiconductor.
  • This means that it conducts electricity under some conditions and acts as an insulator under others.
  • It is even the most common element in the Earth's crust. 
• Lady Ada Lovelace invented looping in computer programming​.
  • Lady Ada Lovelace wrote a complete plan describing the algorithm needed to calculate the Bernoulli numbers using two loops, demonstrating the bifurcation capabilities of the analytical machine, describing how to perform trigonometric operations that made use of variables.