12 grade biology

- This is a representative list of topics covered in our Grade 12 Biology program - however all programs will be customized for the individual studen..

The skeleton of the thorax is made up of bone and cartilage. The thorax is a cone-shaped cavity, broader below than above, and longer behind than in front. It is formed by the twelve thoracic vertebrae at the back, the sternum in front, and the twelve pairs of ribs at the sides,..

Long day plants flower when the day length is greater than a certain critical length, say twelve hours. Examples: Pisum sativum, Triticum aesativum, Beta vulgaris, Onion, carrot and spinac..

The ribs are curved bars, which movably articulate with the thoracic vertebrae at the back and unite with the sternum in front, all collectively forming a bony cage, the thoracic basket. There are twelve pairs of ribs. The upper seven is directly attached to the sternum in front. These a..

The Vertebral Column Or Spinal Column - Vertebral column is also called back bone or spine and encloses the spinal cord. It is a flexible,curved , vertical rod, and consists of a row of 33 movably articulated ring like bones called vertebrae . Between each of the two bones the space is supplemented..

Long day plants, which bloom when light duration is more than 12 hrs per day. Examples: Beet roots, carrot, oats and r..

These are the largest sized leucocytes forming about 5% of the total leucocyte count. They have a oval, kidney or horse shaped nucleus. They are motile and have the power of engulfing bacteria. These also differentiate into macrophages or scavenger cells which remove damaged and dead cells to clea..

This breed is a native of Kaira and Vadodara districts of Gujarat. The average yield is 1600 to 1800 litres. The fat content is about 8-12%. This breed is highly adaptabl..

The mechanism namely the opening and closing of stomata depends upon the turgor pressure in the guard cells. When the guard cells are turgid, the stoma opens and when the guard cells lose water, stoma closes. Stomatal Movement in Dicot Plants Stomatal Movement in Monocot Pla..