Question Discussion & Solution

The chemical substance present in bones and teeth is Calcium Phosphate or Ca₃(PO₄)₂.

• Calcium phosphate is fundamental to the formation of bone and teeth.
• It is essential for achieving optimal peak bone mass in the first 2–3 decades of life and for the maintenance of bone in later life.
• Bones:-
  • Bones are mostly made of collagen, a type of protein.
  • Calcium phosphate, a mineral, is the other main component of the bones.
  • Collagen gives the bones a soft framework, while calcium phosphate is what makes them hard and strong.
  • Bones are made of living tissues, so old bone tissue is broken down and removed, and then new tissue is created to replace the old.
• Teeth:-
  • Enamel – the hard, outer layer of your teeth – is made of minerals like calcium phosphate.
  • Enamel is harder than the bones. It's the hardest substance in the whole body.
  • However, unlike the bones, the teeth enamel doesn't contain any living tissues and so can't heal on its own.

The correct answer is PM Narendra Modi.

Key Points

• Prime Minister Narendra Modi will host the first India-Central Asia Summit in a virtual format on 27 January 2022.
• This will be the first engagement of its kind between India and the Central Asian countries at the level of leaders.
• The virtual summit will see the participation of the five countries Kazakhstan, Uzbekistan, Tajikistan, Turkmenistan, and the Kyrgyz Republic.

Additional Information

• Prime Minister Narendra Modi addressed the World Economic Forum's (WEF) Davos Agenda virtual event on 17 Jan'22.
• PM Narendra Modi has been invited as the chief guest at the 54th convocation ceremony of the IIT Kanpur on 28th Dec 2021.
• Amid the Omicron scare, Prime Minister Narendra Modi has announced the Covid-19 vaccine for children and booster doses for Health workers and senior citizens in December 2021.
• Prime Minister Narendra Modi has laid the foundation stone of Ganga Expressway in Shahjahanpur, Uttar Pradesh in December 2021.
• In October 2021, Prime Minister Narendra Modi has launched the Indian Space Association (ISA).
• Prime Minister Narendra Modi has been named among the 100 most influential people of 2021 by Time Magazine.
• In August 2021, Narendra Modi has become the first Indian Prime Minister to chair an open debate at United Nations Security Council (UNSC).

Given: Girl, Boy, Human

All human are boy and girl.

Key Points

Thus, the correct match is A (III), B (II), C (IV), D (I)

All except 'Handle' are name of vehicles while 'handle' is the name of one of the parts of a vehicle.