Protista

Question 1

What is Protista

Answer 1

Protozoa are unicellular organisms and are often called the animal like protists because they subsist entirely on other organisms for food

Question 2

Examples of Protista

Answer 2

Amoeba, paramecia, and trypanosome

Question 3

Meaning of Protozoa

Answer 3

Means first animal referring to animals that consist of one cell only which are found everywhere

Question 4

Structure of amoeba

Answer 4

The cytoplasm consists of a gel like ectoplasm in the outside and a liquid endoplasm on the inside with a grey, grainy appearance due to the presence of nutrient granules. The outside of the strong, transparent ectoplasm is covered by a very thin plasma membrane.
The endoplasm has a continuous flow that spreads the nutrients throughout the cell

Question 5

Movement of amoeba

Answer 5

Amoeboid movement which is an extremely slow method of moving

Question 6

Characteristics of Protista

Answer 6

• they are eukaryotic
• can be multicellular or unicellular
• some are heterotrophic while others are autrotrophic
• some reproduce sexually and others reproduce asexually
• many are parasitic and live in ponds
• plant like protist are thought to be the ancestors of modern plants
• animal like protist are thought to have been an ancestors of all animals

Question 7

Reproduction of amoeba

asexual

Answer 7

Asexual reproduction occurs binary fission. The nucleus splits to form two identical daughters nuclei that move to opposite sides of the cell. The cell then constricts around its middle, splitting the cytoplasm into two daughter cells each with its own nucleus. The process lasts one hour.

Question 8

Reproduction of amoeba

conjugation

Answer 8

Occurs where two individual cells will come together and temporarily fuse into one. They will exchange nuclear material and protoplasm, before separating again.

Question 9

Reproduction of amoeba

Encystment

Answer 9

occurs with some species during unsuitable conditions such as heat, cold drought, and food shortages. the cell becomes spherical and the protoplasm secretes a waterproof, protective capsule in which the normal vital function can continue at a much slower rate.

Question 10

The ecological and economic role of Protista

Answer 10

The protists are very important to the earth because they produce a lot of oxygen, and most living things need oxygen to survive. These plants like protists form the base of aquatic food chains.
The ecological importance of protists is that they help keep the numbers of bacteria in balance with other organisms