General Biology Notes-2

Plants

Plants are divided into three parts:

1. Autotrophic

2. Heterotrophic

3. Insectivorous

Heterotrophic plants are divided into two parts Parasites- Which are totally dependent on living plants and animals and Saprophytes- Depend on dead and rotting organic remains of plants and animals.

Plants Micro Nutrients

1. N₂ : Deficiency leads to decrease in angle between the stem and the leaf.

2. P: leads to abnormal color of leaf

3. Ca: Deficiency : Leaves appear abnormal in form or often show scorching or spotting effect.

4. Fe: Acute deficiency leads to scorching of leaf margins and tips. Mild deficiency leads to mottled patterns on leaf.

5. Mn: Deficiency leads to poorly developed root system.

6. Zn: In citrus plants, its deficiency causes mottled leaves.

7. Boron (B): Its deficiency leads to "Heart rot of suger beet and marigold"

Digestive, Teeth, Skeleton and Muscular System

Digestive System

The canal or body parts in which digestion takes place is called Alimentary Canal. It starts from mouth, and passing through Oesophagus (food pipe), stomach and small intestine finally ends into large intestine. Absorption of digested food mainly takes place in small intestines. Undigested and unabsorbed material then passes down the colon and rectum which absorb the excess water and with the help of putrefying bacteria form faeces. Finally the faeces passes out through the anus.

Human Digestive Enzymes

Parts	Digestive Juice	Enzyme present
Mouth	Saliva	Ptylin
Stomach	Gastric Juice	Pepsin+ HCL, Renin, Gastric Lipose
Liver	Bile Juice	No Enzyme
Pancreas	Pancreatic Juice	Trypsin, Amylase, Pancreatic
Small Intestine	Succus Entericus	Peptidases, Invertase, Lipase, Maltase, Lactase

- Digestion changes proteins into amino acids, carbohydrates into Monosaccharide glucose, fructose into galactose and fats into fatty acids and glycerols.

- Digestion of proteins is initiated in the stomach by the act of the enzyme pepsin.

- More than 50% of the energy content of the common diet comes from carbohydrates.

- For a normal person about 70 g of proteins and about 400-500 gms of carbohydrates are recommended.