Ghostly Masked Prince Xiao: Pampering And Spoiling the Little Adorable Consort
Answer any three (3) questions only
1a i. Define homeostasis
ii. State two hormones found in plants
iii. Give two reasons why Euglena is regarded as an animal and two reasons why it is regarded as a plant
1a)Homeostasis refers to the ability of the body or a
cell to seek and maintain a condition of
equilibrium or stability within its internal
environment when dealing with external changes. It is involved in the maintenance of the constant internal environment which includes the function of kidney, liver , skin , etc.
1ai.Homeostasis can be defined as a property of an organism or system that helps it maintain its parameters within a normal range of values
iii. Euglena as plant
1.It contains chloroplasts in its cytoplasm
2. It is able to produce its own food by photosynthesis when light is available
Euglena as animal:
1. It can actually move as it has a flagellum. Movement is usually associated with animals.
2. It feeds on food whenever it needs to feed by engulfing the food with its body as our phagocytes do when the sunlight is not available.
- Euglena do photosynthesis using the same basic process that plants use. They also move around and eat, as do animals
-Most species of Euglena have photosynthesizing chloroplasts within the body of the cell, which enable them to feed by autotrophy (making energy-containing organic molecules from inorganic raw material through the use of an energy source such as sunlight), like plants. However, they can also take nourishment heterotrophically (making use of food that comes from other organisms in the form of fats, carbohydrates, and proteins), like animals. Ghostly Masked Prince Xiao: Pampering And Spoiling the Little Adorable Consort
2bi)_*Carbon dioxide:* With the increase of CO in air, rate of respiration decreases slightly.
*Temperature:* Below 20 C and above 45 C the rate of respiration reduces. The optimum temperature for respiration is 20 C – 45 C.
3ai) Enzyme : Proteins that speeds up the rate of a chemical reaction in a living organism. An enzyme acts as catalyst for specific chemical reactions, converting a specific set of reactants (called substrates) into specific products. Without
enzymes , life as we know it would not exist.
II) cyclosis: the circulation of cytoplasm or cell
organelles, such as food vacuoles in some protozoans
III) peristalsis: the progressive wave of contraction and relaxation of a tubular muscular system, especially the alimentary canal, by which the contents are forced through the system.