Question Discussion & Solution

Explanation:

Trend in metallic property:

• As we move along a period from left to right, the metallic character decreases. The elements which are at the extreme left of the periodic table are most metallic in nature and the elements at the right side of the periodic table are non-metals in nature.
• As we go down the group, the metallic character increases and the non-metallic character decreases.
• So, metals at the extreme left and bottom of the periodic table are most metallic in nature.

Reactivity:

• As the metallic character increases, the Ionisation potential decreases and the reactivity of the elements also increases.
• The most reactive metal is thus Cs (Cesium), situated at the bottom left corner of the periodic table.

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Hence, the most active metal known is Cesium.

• Francium is the element present at the bottom of the periodic table, but it is a lab-made element, and not naturally occurring, which makes Cs as the most reactive element. 

Concept:

• Nutrition is a process by which an organism consumes and uses food materials.
• According to WHO, Nutrition is the intake of food, considered in relation to the body's dietary needs.
• There are various modes of nutrition mainly Autotrophic, Heterotrophic, Chemoautotrophic, Saprophytic,  etc.

Explanation:

• Holophytic or autotrophic nutrition: In this type of nutrition the organisms prepare their food by themselves. Eg - green plants.
• Plants prepare their food by the process called photosynthesis. 
• During photosynthesis, plants trap solar energy or light energy with the help of chloroplast present in the green leaves and convert it into Chemical energy
• A pigment called chlorophyll is present in the chloroplasts which are required in trapping sunlight
• Plants utilize Carbon dioxide and Water for the synthesis of carbohydrates during photosynthesis, oxygen is liberated as a side product
• This gaseous exchange occurs through the stomata present on the leaf surface

• These events can be demonstrated by the following equation:

  \(\rm \underset{(Carbon\ dioxide)}{6CO_2} + \underset{(Water)}{6H_2 O} \xrightarrow[Chlorophyll]{Sunlight} \underset{(Carbohydrates)}{C_6H_{12}O_6} + \underset{(Oxygen)}{6O_2}\)

Therefore, Plants require CO₂, Chlorophyll, Sunlight and water for autotrophic nutrition and hence the correct option will be ''All of these''.

The Correct Answer is "boron deficiency".

• Boron deficiency is a deficiency of the micronutrient boron in plants.
• It causes large losses in crop production and crop quality
• It affects the vegetative and reproductive growth of plants, resulting in inhibition of cell expansion, death of meristem, and reduced fertility.

​Important Points

• Boron deficiency in sugar beets characteristically causes the death of the growing point and the development of blackheart rot.
• Before the deficiency has reached this stage, the leaves, which may have cracked petioles, will have become progressively smaller and somewhat misshapen.
• After the death of the growing point, small bunches of leaves develop in the older leaf axils and the crown is very liable to become hollow and rot.

Additional Information

• The hollow heart is an internal disorder where a 'lens' or 'star'-shaped cavity forms in the tuber.
• It appears to be caused by an abrupt change in tuber growth rate which usually occurs after a period of stress.
• Water, heat stress and associated calcium deficiency appear to have a role in the development of a hollow heart.
• The crisp variety Atlantic and the French fry variety Russet Burbank are prone to hollow heart but if conditions are right most varieties can be affected.
• Hollow heart is an important problem for the potato industry as payments from processors and washer-packers for fresh market potatoes may be reduced. 

The correct answer is New Delhi.

• The "Indian Sports Summit - Fitness: $ 10 Billion Opportunity" was organized in New Delhi.

Key Points

• The event was launched by Prime Minister Narendra Modi.
• The aim event was focused on driving objective of ‘Sports and Industry’ by various initiatives, advocating for new policies for the sector, encourage investments in the sector of sports, create a roadmap in encouraging fitness programmes in school education and industry participation in the FIT INDIA Movement.
• Current Youth Affairs and Sports Minister is Mr Kiren Rijiju.

Total number of people = 45

Position of A from the behind = 26^th

Position of A from the front = Total number of people – A’s position from the behind + 1

= 45 – 26 + 1

= 20^th