Write short notes on platelets.

Blood is a red coloured fluid connective tissue. The components of blood are plasma, red blood cells, white blood cells, and blood platelets. Platelets are also called as thrombocytes, that is a tiny blood cells that helps in blood clotting, to stop the bleeding. They rush to the site of damage to form a plug (clot) to fix the damage.

Write short notes on lymph.

Lymph is the fluid that flows through the lymphatic system, a system composed of lymph vessels and intervening lymph nodes whose function, as the venous system, is to return fluid from the tissues to the central circulation.

Draw a neat and clean diagram of Human alimentary canal and label the following. (i) Bile duct (ii) Stomach (iii) Oesophagus.

The digestive system of humans includes two main components-Alimentary canal and digestive glands. The alimentary canal performs diverse functions like ingestion, digestion, absorption, elimination of undigested food.

Write the names of two enzymes found in pancreatic juice.

The pancreas plays an important role in the digestion and regulation of blood sugar. The pancreatic juice which is secreted by the pancreas contains a number of digestive enzymes. The two enzymes found in pancreatic juice are amylase, and lipase. These are involved in the breakdown of polysaccharides, and fats respectively.

What is the difference between Autotroph and Heterotroph Give an example of each also.

Characteristic Autotrophs Heterotrophs Definition The organisms that make their food by themselves are called autotrophs. Example: All green plants are autotrophs. The organisms that do not make their own food are called heterotrophs. Example: All animals are called heterotrophs. Photosynthetic pigment Chlorophyll is present. Chlorophyll is absent. Characteristic Autotrophs Heterotrophs Role in ecosystem They act as producers in an ecosystem. Their examples include green plants, algae and some bacteria. They act as consumers in an ecosystem. Their examples include herbivores, omnivores, and carnivores.