Correct Answer: A. Breaking down food into smaller molecules

Correct Answer: D. are large nucleated cells

Correct Answer: C. Humidity

Correct Answer: C. cocoa, maize and rice

Correct Answer: C. have rigid thick walls

Correct Answer: A. Zinc

Correct Answer: C. Spirogyra

Correct Answer: D) gets rid of excess water

Explanation

Paramecium is a type of single-celled organism that lives in freshwater environments. It has a specialized organelle called the contractile vacuole, which serves an important function in regulating the water balance within the cell. The function of the contractile vacuole is to get rid of excess water that enters the cell by pumping it out through a pore on the surface of the cell. This is important because too much water can cause the cell to burst, and so the contractile vacuole helps to prevent this from happening. Option A, producing enzymes, is not correct because the contractile vacuole does not produce enzymes. Option B, getting rid of excreta, is also not correct because the contractile vacuole is not involved in excretion. Option C, storing and digesting food, is not correct because this is the function of other organelles such as the food vacuole and lysosome. Therefore, the correct answer is Option D, getting rid of excess water. The contractile vacuole plays an important role in maintaining the water balance within the cell of Paramecium.

Correct Answer: A. Chlamydomonas

Correct Answer: D) cell membrane

Explanation

This question is asking for a similarity between a typical animal cell and a typical plant cell. The options are cellulose, chlorophyll, centrally placed nucleus, cell membrane, and large vacuole. Both animal and plant cells are two types of eukaryotic cells, which means they have a nucleus and other membrane-bound organelles. In terms of similarities, both types of cells have a cell membrane which is responsible for controlling what goes in and out of the cell, and for providing structure and support to the cell. Option A, cellulose, is a carbohydrate that is found in the cell walls of plant cells but not in animal cells. Option B, chlorophyll, is a pigment that is found in plant cells but not in animal cells. Chlorophyll is responsible for absorbing light energy for photosynthesis. Option C, centrally placed nucleus, is not a similarity between the two cells because in animal cells, the nucleus is not always centrally placed while in plant cells, the nucleus is usually located at the periphery of the cell. Option E, large vacuole, is a characteristic of plant cells but not typical animal cells. Therefore, the correct answer is option D, cell membrane, which is a similarity between typical animal and plant cells as both types of cells have cell membranes. It is important to note that while there are similarities between animal and plant cells, there are also many differences. For example, plant cells have chloroplasts and a large central vacuole, while animal cells do not. Overall, understanding the similarities and differences between animal and plant cells is important for understanding basic cell biology and the functions of different organelles within the cell.