Popular Science Appratus Workshops Private Limited

A day and night model is a representation that helps illustrate the concept of Earth's rotation and the resulting alternation between day and night. The Earth rotates on its axis, an imaginary line running from the North Pole to the South Pole, causing different parts of the Earth to face the Sun or be in shadow at different times. Here's how you can create a simple day and night model:

1. Materials:

   • A globe or spherical object representing the Earth
   • A small light source (representing the Sun)
   • A marker or pen
   • A darkened room

2. Procedure:

   • Place the globe in the center of the room. This represents the Earth.
   • Choose a spot to represent the Sun and position the light source there.
   • Use the marker to mark the position of a specific point on the globe (e.g., a dot or a small label). This point will represent a location on Earth, such as a city.
   • Turn off the room lights to create darkness.

3. Demonstration:

   • With the light source on, observe how the side of the Earth facing the Sun is illuminated, representing daytime.
   • Note how the marked point on the Earth experiences daylight.
   • As you rotate the globe on its axis, observe how different parts of the Earth experience daylight or darkness at different times.
   • Explain that this rotation is responsible for the cycle of day and night on Earth.

4. Discussion:

   • Discuss the concept of Earth's rotation, explaining that it takes approximately 24 hours for the Earth to complete one full rotation.
   • Emphasize that the side of the Earth facing the Sun experiences daylight, while the opposite side is in darkness, experiencing nighttime.
   • Explore how different locations on Earth experience sunrise, daylight, sunset, and nighttime as the Earth rotates.

5. Extension:

   • Discuss how the tilt of Earth's axis contributes to the changing seasons.
   • Explore how the length of daylight varies at different latitudes and times of the year.
   • Consider introducing the concepts of time zones and the International Date Line.

• Political globe
• Capable of rotation round its axis with a candle holder

Affordable, easy-to-understand, realistic replica of the ‘molecule of life’. Your students will construct their own double helix model complete with cytosine, adenine, guanine and thymine nucleic acid bases; connecting phosphate strands; and a center rod representing hydrogen bonds.

Easy-to-assemble, this three-dimensional model is made of durable plastic components for years of classroom use. Features sturdy, metal base for easy rotation and classroom display. Color-coded parts feature specially shaped ends to ensure proper base pair alignment and can be unzipped to demonstrate DNA replication.

Medical DNA model protein structure model
Material: PVC
Size: 23*22*68.5cm
That is for teacher to shows the students how is DNA structure compound.
G.W.: 10kgs
Packing: 4pcs/carton, carton size: 46*45*64cm

• Plant cell only.
• Grades: 3 - 8.
• Reproducible worksheets and cross-curricular labs.
• These resilient, colorful EVA foam models feature removable parts

• A model of the plant cell's fundamental organelle handcrafted in translucent fiber-reinforced resin at approximately 50,000X
• Clearly visible are circular chromosomes, outer and inner organelle membranes, inter-membrane space, starch granules, lipid inclusions, and ribosomes
• A cutaway face exposes the thylakoid space and membranes of cross-cut grana, while protruding grana demonstrate their reticulated structure.
• Four reproducible keycards included (color, and black and white labeled and unlabeled).

• This unique depiction shows the external cellular structures of the prokaryotic cell enlarged 280,000X.
• Partially cutaway to reveal internal structures, illustrations include pili, flagella, chromosomal DNA, an inclusion body, plasmids, ribosomes, the cell envelope, and the plasma membrane.
• The structure is removable from the stand and comes with key cards.

• Made of translucent fiberglass, this model includes flagellum, stigma, blepharoplast, contractile vacuole, chloroplast, pyrenoid, rhizoplast, nucleus, and endosome.

Demonstrates all of hand functionality and the external anatomical structures.

On stand.

Life size.

Made of PVC plastic.

Demonstrate all of hand functionality and the external anatomical structures.

Made up of PVC plastic with natural size.

Including flexible artificial ligaments.

Mounted on a base, appropriately colored and numbered with key card.

The model showing the Liver, Gall Bladder, Right Hepatic Duct, Left Hepatic Duct, Cystic Duct, Duodenum, Panceratic Duct, Pancreas.

• Basic unit of 75 rocks and minerals demonstrates major rock-forming minerals.
• Unit includes 75 specimens.
• Size: 1-1/4” x 3/4″ 
• Edition specimens are 3” x 3”.
• Scale of hardness and recognized physical properties. 
• a streak plate, magnet magnifier and compartmented container. 

• This set of 8 sequential models graphically illustrate the division of chromosomes and mitotic apparatus.
• Organelles and cell inclusions are embedded in strong, crystal-clear plastic globes consisting of the nucleus, nucleolus, double thread chromosomes (each in a different color), centrioles, centromeres (kinetochores), aster, and spindle fibers.

• Natural bone mounted in natural position.
• On base with an acrylic cover.