Question Discussion & Solution

The correct answer is Harmeet Desai.

• Harmeet Desai won the men's singles title at the International Table Tennis Federation Challenge Indonesia Open 2019 Table Tennis Tournament.

Key Points

• The tournament was held in Batam, Indonesia. 
• He also won the Commonwealth championship in July 2019 held in Cuttack, Odisha. 
• He defeated Amalraj Anthony of India.

Additional Information

• Table Tennis:
  • The first match of The Table Tennis World Championship was played in 1927.
  • Table Tennis Association of India was formed in 1938.
  • Terminologies used in Table Tennis are Volley, Late service, Half volley, Backhand, Drive spin, Topspin, Chop, etc.
  • Swaythling Cup, Corbitton Cup, Barna-Bellack Cup, and Ramanujan Trophy are related to table tennis.

Oboe is a musical instrument. Similarly, scalpel is a surgical instrument used in surgeries.

The study of the human mind is called Psychology.

Similarly,

the study of insects is called Entomology.

Hence, the correct answer is "Entomology".

The correct answer is option 2 i.e C₄H_10.

Concept:

Hydrocarbons

• Compounds made of carbon and hydrogen atoms only are called hydrocarbons.
• Saturated hydrocarbons:
  • The hydrocarbons in which carbon atoms are singly bonded are called saturated hydrocarbons.
  • Saturated hydrocarbons are also called alkanes or paraffin.
    • The general formula of alkane– CnH2n+2.
• Unsaturated hydrocarbons:
  • The hydrocarbons in which carbon atoms are either doubly or triply bonded are called unsaturated hydrocarbons.
  • Doubly bonded (carbon atoms) hydrocarbons are called alkenes.
  • The general formula of alkene is CnH2n.

• The formula for alkane should be mentioned C_nH_2n+2

Explanation:

The correct answer is Mode of Nutrition.

• In 1969, R.H. Whittaker introduced the five-kingdom system of classification.
• In the five-kingdom system, the basis of classification is the complexity of cell structure, physical organization, nutrition method, and life cycle.
• Aristotle firstly divided the living world into two groups, namely, flora and fauna.
• After that, in his book 'Systema Naturae', Linnaeus classified all animals into plants and animals.
• Linnaeus is called the 'father of modern classification system'.

Additional Information

• Whittaker classified all creatures in the following five kingdoms -

1. Kingdom Monera-
   • ​​This world consists of prokaryotic organisms ie Bacteria, Cyanobacteria, and Archaebacteria.
2. Kingdom Protista-

• This world consists of unicellular eukaryotic organisms. Yuglina, which is situated between plants and animals, is included in this world.

3. Kingdom Fungi-

• This includes organisms dependent on parasites and dead food for food. Their cell wall is made of chitin.

4. Plant World (Kingdom Plantae)-

• This world consists of algae and multicellular green plants.

5. Kingdom Animal-

• This includes all multicellular animals. It is also called 'Metazoa'.