What is meant by life processes? Name the basic life processes common to all living organisms which are essential for maintaining life.
Answer
The basic functions performed by living organisms to maintain their life on this earth are called life processes. The basic life processes common to all living organisms are?
Nutrition and Respiration; Transport and Excretion; Control and Coordination; Growth; Movement and Reproduction.
Name the excretory organs in unicellular organisms.
Answer
The unicellular organisms have no organs for excretion. As they live in an aquatic habitat, They excrete out wastes by simple diffusion through their plasma membrane (general body surface) into their surroundings.
Which raw materials are responsible for the release of $O _2$, in photosynthesis?
Answer
Water used up in the Photosynthesis is responsible for release of Oxygen.
Earlier it was thought that source of $O _2$ in photosynthesis is $CO _2$. But Ruben, Karen used heavy but non radioactive, stable isotope of oxygen $O (18)$ through which they came to the conclusion that $O _2$ evolved during light reaction comes from $H _2 O$ (water) and not from $CO _2$.
What will happen if platelets were absent in the blood?
Answer
Blood platelets are a source of thromboplastin which is essential for blood clotting at the place of injury. In the absence of blood platelets, blood clotting will be litde resulting in greater loss of blood from the place of injury.
What happens to extra glucose or carbohydrate in an animal body?
Answer
In an animal body, extra glucose or carbohydrate is stored in the liver as well as in skeletal muscles in the form of glycogen. glycogen stored in liver (a complex carbohydrate like starch) and stored in the liver(a small amount is stored in the muscle as well).
This glycogen is converted to glucose when blood glucose level falls. This process helps us to maintain blood sugar levels in between meals.