Explanation

Germs (pathogens) are spread through various methods, and air, water, and food are all significant sources of transmission for different types of diseases. 

Air: Germs can be inhaled through the nose and mouth in tiny respiratory droplets expelled when an infected person coughs, sneezes, or talks. Diseases like colds, flu, COVID-19, and measles spread this way.

Water: Contaminated water sources can carry harmful germs, causing diseases like cholera, typhoid, and diarrhea when consumed or used for cooking/washing.

Food: Improperly prepared, handled, or stored food can be a major source of infection, leading to illnesses such as E. coli or botulism. 

Explanation

• Taxonomy is the science of classifying living things, including animals and plants, into groups based on their characteristics, evolutionary relationships, and common ancestors.
• It involves the identification, naming, and classification of species, as well as the study of their relationships and evolutionary history.

Explanation

Accumulation of salts in kidneys leads to the formation of solid crystals called kidney stones.

These stones can block the flow of urine and cause severe pain and other complications.

Explanation

The rod cells of the retina are responsible for vision in dim light or at night (scotopic vision),

Providing black and white, low-resolution vision, and contributing to peripheral vision.

They are more numerous and more sensitive to light than cone cells, but they cannot detect color or fine details. 

Explanation

Penguins are the birds which do not fly but swim to go from one place to another.

Penguins have flippers which help them swim underwater.

Penguin means پنکھ دار بحری پرندہ

Explanation

Elephants, bears, chickens, monkeys, cows, wolf, birds, etc. are warm blooded animals

Warm blooded means گرم خون والا

Explanation

An invertebrate is an animal without a backbone.

Worms, like earthworms, are classified as invertebrates.

They lack a backbone and are found in various environments. 

Explanation

Magnesium deficiency can contribute to or exacerbate all of the following health issues:

• Painful joints: Magnesium helps regulate inflammation and muscle function, and deficiency can lead to joint pain and stiffness.
• Osteoporosis: Magnesium is essential for bone mineralization and density; deficiency can increase the risk of osteoporosis and fractures.
• Memory loss: Magnesium plays a role in neuronal function and synaptic plasticity; deficiency has been linked to cognitive impairment and memory loss.
• Diabetes: Magnesium helps regulate insulin sensitivity and glucose metabolism; deficiency can increase the risk of developing type 2 diabetes.

Explanation

Marasmus is a form of severe protein-energy malnutrition, characterized by a lack of sufficient protein and calories in the diet.

It is most commonly seen in children under the age of 5, particularly in developing countries where access to nutritious food is limited.

Marasmus is caused by a severe deficiency of protein and calories, leading to:

• Wasting of muscles and tissues
• Weight loss
• Fatigue
• Weakness
• Poor growth and development

Explanation

• Herbivores are animals that eat only plants, including leaves, stems, roots, flowers, fruits, and seeds.
• Examples of herbivores include cows, deer, rabbits, and elephants.