Full Form of PNS, PSD, and PTR

In Biology (Control and Coordination), the nervous system has two main parts: the CNS and the PNS.

• Full Form: PNS stands for Peripheral Nervous System.
• Meaning: While the CNS consists of the brain and spinal cord, the PNS consists of all the nerves that branch out from the brain and spinal cord to the rest of the body (hands, legs, organs). Its job is to send messages from the body to the brain and vice versa.

If you work with graphic design or photos, you will see files ending in .psd.

• Full Form: PSD stands for Photoshop Document.
• Meaning: It is the default file format used by Adobe Photoshop. Unlike a normal JPEG image, a PSD file saves all the editable 'layers', text, and effects so the designer can continue editing the image later.

In government education policies (like the Right to Education Act), PTR is a critical metric.

• Full Form: PTR stands for Pupil-Teacher Ratio.
• Meaning: It is the ratio of the number of students (pupils) to the number of teachers in a school. For example, a PTR of 30:1 means there is one teacher for every 30 students. A lower PTR is better for education quality.