Question Discussion & Solution

The positions of the letters according to the English alphabet series:

The pattern for this code is as follows;

Similarly;

Hence, "HFIZG" is the correct answer.

Shortcut Trick

Shortcut to remember the reverse positional letters.

The correct answer is Potato.

Modifications of Root

1. For storage of food
   • Roots are modified in some plants for storing reserve food materials.
   • These modified roots usually are swollen and assume different forms such as spindle-shaped, e.g., radish; top-shaped, e.g., beet, turnip; cone-like, e.g., carrot; indefinite shape, e.g., sweet potatoes.
   • Dahlia, Asparagus, Portulaca are some other examples of plants with modified roots for food storage.
2. Nodulated roots
   • The roots of pea and other leguminous plants have numerous swollen nodules on fine branches of roots.
   • These nodules are formed due to the symbiotic association of Rhizobium (bacterium) that live inside the root cortical cells of the roots.
   • They fix nitrogen and an active nodule is pink in colour.
3. For mechanical support
   • Roots are modified to provide mechanical support as seen in a banyan tree which has roots growing vertically/obliquely downwards (prop roots); sugarcane/maize in which roots arise from the nodes in the cluster at the base of the stem (stilt roots) and betel/black pepper in which nodes and internodes bear roots which help in climbing.
4. For gaseous exchange
   • Pneumatophores or breathing roots are found in plants growing in mangroves or swamps with saline water for exchange of gases.
   • They are erect peg-like structures with numerous pores through which air circulates e.g., Rhizophora mangle.

• Modifications of Stem

1. For storage of food
   • Stems get modified into underground structures for storage of food as seen in potato (tuber), ginger (rhizome), garlic (bulb), yam (corm).
   • Presence of an eye (node) in potato, distinct nodes with internodes and scaly leaves in ginger/yam, a cluster of roots at the base of the reduced stem in garlic/ onion, all indicate that these underground plant parts are modified stem.
2. For vegetative propagation
   • Plants besides reproducing sexually also propagate through vegetative parts.
   • For this purpose, stems may be modified into a runner (Cyanodon dactylon, Oxalis). Runners are slender prostrate branches arising from axillary buds;
   • stolon (e.g., mint, strawberry) which is a slender lateral branch arising from the base of the stem grows upward and then down to develop new daughter plants;
   • offset having a single long horizontal internode growing up to some distance and producing a tuft of leaves above and a cluster of roots below at the apex (Eichornia, Pistia) and
   • sucker, which arises from the underground part of the stem, grow obliquely and gives rise to a new shoot. (Chrysanthemum, Banana, Pineapple).
3. For protection
   • Some modified stem provides protection as thorns which are hard, pointed structures each representing a branch that arises from the axil of a leaf.
   • Thorns are found in plants like Duranta, Pomegranate, Acacia, Ber, Prosopis, Bougainvillea, Citrus, etc.
4. For support
   • Tendrils are modifications of the stem to provide support to plants, e.g., Vitis, passionflower, Bignonia etc.
5. For photosynthesis
   • Stems are also modified into Phylloclade, to facilitate photosynthesis.
   • Phylloclades are flattened/cylindrical stem or branches of unlimited growth (Cactus).

The correct answer is Another name for the coronavirus that created the epidemic in 2020.

Key Points

• The Ministry of AYUSH has launched the Jan Andolan Campaign on COVID-19.
• This Andolan is regarding “Public Health Response to COVID-19: Campaign for COVID-Appropriate Behaviour” which has been launched by the Prime Minister.
• The three key messages which are being highlighted across it are - “Wear Mask, Follow Physical Distancing, and Maintain Hand Hygiene.

The correct answer is New Incognito Window.

Key Points

• Incognito Window
  • ​Private browsing is a privacy feature in some web browsers.
  • When operating in such a mode, the browser creates a temporary session that is isolated from the browser's main session and user data.
  • Browse in private
    • Switch on computer > open the Chrome app.
    • To the right of the address bar, tap More> New Incognito tab.
    • A new window appears.
    • In the top left, check for the Incognito icon.

Additional Information

• New tab and New window
  • The big difference is that browser tabs are easier for users to manage than browser windows.
  • When a new window opens, it covers the user's earlier window.
  • But when a new tab opens, the user can still see their earlier tab at the top.
• New Window
  • ​Open File Explorer (Win+X)> Right-click or press and hold on one or more selected folder libraries, or drives in File Explorer> click/tap on Open in a new window.
• New Tab ​
  • New Tab is a button on the tab bar which easily creates a new file. 
• ​Bookmark
  • ​A bookmark is a saved shortcut that directs your browser to a specific webpage.
  • It stores the title, URL, and favicon of the corresponding page.

The correct answer is Boy pushing wall in a room.

Key Points

• Boy pushing the wall in the room is not an example of work done.
  • When a boy pushes a wall, he is applying force on the wall. We see that the wall shows no displacement.
  • Work is given as the product of the forces and the displacement in the same direction.
  • Hence the work done is zero.

Additional Information

• Work is done when a force moves. Everyday examples of work include walking up a flight of stairs, lifting heavy objects, pulling a sled and pushing a shopping trolley, Applying pressure on a pebble lying on the surface, raising a book to a height.
  • Work is not done when holding a bag stationary or a book at arm's length because although a force is being applied, the force does not move.