Which of the following processes forms somatic cells?
Oogenesis
Spermatogenesis
Mitosis
Meiosis
The Correct Answer is C
A. Oogenesis is the process of egg cell (ovum) formation in females and is responsible for producing gametes, not somatic cells.
B. Spermatogenesis is the process of sperm cell formation in males, also producing gametes, not somatic cells.
C. Mitosis is the process that produces somatic cells. It is a type of cell division that results in two genetically identical daughter cells, each with the same number of chromosomes as the parent cell. Somatic cells are all body cells except for gametes.
D. Meiosis is the process that forms gametes (sperm and eggs), reducing the chromosome number by half to ensure sexual reproduction results in a normal chromosome count. It does not form somatic cells.
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Related Questions
Correct Answer is A
Explanation
A. The plasma membrane, also known as the cell membrane, surrounds the cell and encloses the cytoplasm. It acts as a barrier, controlling the movement of substances in and out of the cell.
B. The Golgi apparatus is an organelle that modifies, sorts, and packages proteins and lipids for transport, but it does not enclose the cytoplasm.
C. The endoplasmic reticulum is involved in the synthesis of proteins and lipids within the cell but does not enclose the cytoplasm.
D. The flagellum is a tail-like structure that helps some cells move but does not enclose the cytoplasm.
Correct Answer is A
Explanation
A. During the expiratory phase of respiration, the diaphragm relaxes and moves upward, causing the chest cavity to decrease in size and forcing air out of the lungs. This is a key part of the breathing process.
B. Oxygen is not taken into the lungs during expiration. Instead, expiration is the process of expelling carbon dioxide from the lungs after oxygen has been absorbed during inspiration.
C. The diaphragm contracts during the inspiratory phase to increase the volume of the lungs and draw air in, not during expiration.
D. Oxygen is not released from the lungs during expiration; rather, carbon dioxide is expelled from the lungs as a waste product of metabolism.
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