Question Discussion & Solution

Explanation:

• Bacteria are the sole members of the Kingdom Monera. They are the most abundant micro-organisms.
• On the basis of origin, bacteria can be divided into two types - Archaebacteria & Eubacteria

Archaebacteria:

• These bacteria are special since they live in some of the harshest habitats such as extreme salty areas (halophiles), hot springs (thermoacidophiles) and marshy areas (methanogens).
• Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.
• For example - Methanogens are present in the gut of several ruminant animals such as cows and buffaloes and they are responsible for the production of methane (biogas) from the dung of these animals.

Additional Information 

Eubacteria:

• There are thousands of different eubacteria or ‘true bacteria’.
• They are characterised by the presence of a rigid cell wall, and if motile, a flagellum.
• The Eubacteria can be both autotrophic & heterotrophic.

If '+' means 'divide by', '-' means 'add to', '×' means 'subtract from' and '/' means 'multiply by',

[{(20 × 6) × (7 / 2)} + (3 - 2)] / 5

We put the right symbol given is the question-

= [{(20 - 6) - (7 × 2)} / (3 + 2)] × 5

Now apply BODMAS rule

= [{14 - 14} / 5] × 5

= [0 / 5] × 5

= 0

Hence, "0" is the correct answer.

The study of the human mind is called Psychology.

Similarly,

the study of insects is called Entomology.

Hence, the correct answer is "Entomology".

In a certain code language, 'BENJAMIN' is written as 'NIMAJNEB'. First letter of the word moves last and second letter of the word moves second last place and so on.

Similarly, 'POVERTY' written in that code language as 

POVERTY is written as YTREVOP.

Hence, "YTREVOP" is the correct answer.

Option 3 is correct, i.e. p-block.

• Modern Periodic Table:
  • The Modern Periodic Table is classified into the following elements - p-block, s-block, d-block, and f-block.
  • The p-block elements include chalcogens, pnictogens, halogens, inert gases.
    • The 18^th group is known as Inert gas, zero groups, Nonreactive gases.
    • The 17^th group is known as Halogen.
    • The 16^th group is known as Chalcogen.
    • The 15^th group known as Pnictogen.
    • Pnictogen group refers to the choking property of nitrogen gas (as opposed to air, which contains oxygen as well as nitrogen).
    • Nitrogen family elements consist of atoms having 5 electrons in their outer energy level. Two of the electrons are in the s subshell, with 3 unpaired electrons in the ​p subshell.
  • The s-block elements include alkali metals and alkaline earth metals. 
  • The d-block elements include Transition elements.
  • The f-block elements include Inner Transition Elements.