biology for grade 7

It is present at the bend of the duodenum. It secretes pancreatic juice which has an almost neutral pH (6 to 7). This juice is secreted into the common bile duct and then into the duodenum. About 700cc of pancreatic juice is secreted everyday. Pancreatic juice consists of enzymes like the..

These are also called as scavenger cells. They form about 79% of the total leucocyte count. It has granular cytoplasm and a multilobed nucleus (2-7 lobed). They show amoeboid movement Their life span is about 10-12 hours. They engulf pathogens by phagocytosis . When neutrophils die it i..

The electrons released by P 7 0 0 of PS-I in the presence of light are taken up by the primary acceptor and are then passed on to ferredoxin (Fd), plastoquinone (PQ), cytochrome complex, plastocyanin (PC) and finally back to P 7 0 0 i.e., electrons come back to the same m..

Pancreas - It is present at the bend of the duodenum. It secretes pancreatic juice which has an almost neutral pH (6 to 7). This juice is secreted into the common bile duct and then into the duodenum. About 700cc of pancreatic juice is secreted everyday. Pancreatic juice consists of enzym..

1. Pisum sativum (pea) 2. Dolichos lablab (country bean) 3. Dolichos biflorus (horse gram) 4. Phaseolus mungo (black gram) 5. Phaseolus radiatus (green gram) 6. Cajanus cajan (red gram) 7. Glycine max (soya bean) 8. Cicer arientium (bengal gr..

Carbon dioxide is transported in three different forms - dissolved gas, bicarbonates and carbaminohaemoglobin molecules. About 3.7ml of carbon dioxide enters each 100ml of blood. A small amount in the plasma is transported in the dissolved form. Most of the carbon dioxide enters the red ..

Centrifugation is a process by which, the homogenate or suspension of biological material is rotated in circle around a central axis at different speeds. The instrument used for this is called centrifuge . Due to the centrifugal force, the different components settle down in different lay..

Diet is the food on which an individual lives. A balanced diet may be defined as the one which contains all the essential nutrients like carbohydrates, fats, proteins, minerals and vitamins in the correct proportion for the normal growth and development of the body. A balanced diet is related to th..

Neutrophils contain neutral-staining granules. The nucleus is 2 to 7 lobed. They number 3000 to 6000 per cubic mm. Their life span is 12 hours to 3 days. Their function is phagocytosis of bacter..

These are grown in ecologically fragile areas. Felling of trees and grazing of cattle are prohibited in these forests. 6) A special function of tree plantation, Van Mahotsava, is held each year in February and July since 1950 to propagate the idea of forest conservation. 7) Many Internat..