Explanation

Antonie van Leeuwenhoek, a cloth merchant by trade, is credited for the discovery of single-celled microorganisms.
He called them “wee animalcules” (little animals).

Explanation

Phases of the moon occur because we can see only that part of the moon which reflects light towards us.

The changing shape of the bright part of the Moon that we see is called its phase.

The moon is illuminated because it reflects the light from the sun.

The part of the moon facing the sun is lit up.

The part facing away from the sun is in darkness.

Explanation

A solar panel, consisting of many photovoltaic cells.

A photovoltaic (PV) cell is an energy harvesting technology.

It converts solar energy into useful electricity through a process called the photovoltaic effect.

Explanation

A child respires around 26 times per minute.

Normal man respires 14-18 times per minute.

If the CO2 concentration in blood increases, the rate of breathing also increases.

When CO2 is dissolved in the blood, then blood becomes slightly acidic.

The brain picks up the change and adjusts the breathing to get rid of CO2 from the blood.

Explanation

Cyclones are usually accompanied by high rainfall.

heavy showers mean: A period of heavy rain

Cyclones mean  ایک قسم کی طوفان

heavy showers  زیادہ بارش/  بھاری بارش

ND16-3-2023

Explanation

• A newborn infant has about 300 bones.
• It fuse to form the 206 bones typical in adults.
• The human skull has 22 bones.
• The hand contains 27 bones.

Explanation

Fresh milk has a pH value of 6.7.

Bacteria from the family of Lactobacillaceae are lactic acid bacteria (LAB) responsible for the breakdown of the lactose in milk to form lactic acid.

Explanation

Straw, camphor, alcohol, petrol, diesel etc. catch fire easily to release heat energy and light energy.

So, these are examples of combustible substances.

Explanation

Glucose, a form of sugar, is the primary source of energy for every cell in the body.

Because the brain is so rich in nerve cells, or neurons, it is the most energy-demanding organ, using one-half of all the sugar energy in the body.

Explanation

Horticulture is the agriculture of plants

Agrostology: Study of Grasses 

Agronomy: soil management and crop production 

Odontology: Study of teeth 

Arthrology: Study of joints 

Nephrology: Study of kidneys

Hematology: Study of blood  

Dermatology: Study of skin