1. Spermatids are produced directly from which cells during spermatogenesis?
A.
Primary spermatocytes
B.
Secondary spermatocytes
C.
Spermatozoa
D.
Spermatogonia
Correct Answer:
Secondary spermatocytes
Explanation:
Spermatids are formed when secondary spermatocytes complete the second meiotic division.
2. What is the chromosome condition of a spermatid in humans?
A.
Diploid
B.
Triploid
C.
Haploid
D.
Tetraploid
Correct Answer:
Haploid
Explanation:
Spermatids contain a haploid set of chromosomes because they are formed after meiosis.
3. The transformation of spermatids into spermatozoa is called:
A.
Spermatogenesis
B.
Spermiation
C.
Spermiogenesis
D.
Fertilization
Correct Answer:
Spermiogenesis
Explanation:
Spermiogenesis is the process by which spermatids differentiate into mature spermatozoa.
4. Spermatids are generally described as:
A.
Motile cells with a flagellum
B.
Non-motile cells that differentiate into spermatozoa
C.
Diploid stem cells
D.
Large cells that produce testosterone
Correct Answer:
Non-motile cells that differentiate into spermatozoa
Explanation:
Spermatids are immature, non-motile germ cells that undergo structural changes to become spermatozoa.
5. During spermiogenesis, which structure develops from a spermatid to help the sperm move?
A.
Flagellum
B.
Nucleolus
C.
Centromere
D.
Cell wall
Correct Answer:
Flagellum
Explanation:
A flagellum develops during the differentiation of a spermatid and later enables sperm movement.
6. What happens to the nucleus of a spermatid during spermiogenesis?
A.
It becomes larger and rounder
B.
It disappears completely
C.
It becomes condensed and streamlined
D.
It divides into four nuclei
Correct Answer:
It becomes condensed and streamlined
Explanation:
During spermiogenesis, the spermatid nucleus condenses and becomes streamlined as part of sperm formation.
7. Which organelle-rich region of a developing spermatid helps provide energy for sperm movement?
A.
Acrosome
B.
Middle piece
C.
Nucleus
D.
Cell membrane
Correct Answer:
Middle piece
Explanation:
The middle piece of the developing sperm contains many mitochondria that provide energy for movement.
8. The acrosome of a spermatozoon develops from which structure in a spermatid?
A.
Golgi apparatus
B.
Mitochondrion
C.
Ribosome
D.
Centrosome
Correct Answer:
Golgi apparatus
Explanation:
During spermiogenesis, the Golgi apparatus of the spermatid forms the acrosome.
9. A spermatid becomes a spermatozoon mainly by undergoing:
A.
Further meiotic divisions
B.
Cell growth without differentiation
C.
Differentiation and structural changes
D.
Fusion with another spermatid
Correct Answer:
Differentiation and structural changes
Explanation:
Spermatids do not divide further; they differentiate and undergo structural changes to form spermatozoa.
10. Which of the following is a correct feature of a spermatid?
A.
It is formed before meiosis begins
B.
It is haploid and develops into a spermatozoon
C.
It produces testosterone
D.
It is a mature, fully motile sperm cell
Correct Answer:
It is haploid and develops into a spermatozoon
Explanation:
A spermatid is a haploid germ cell formed after meiosis and later differentiates into a spermatozoon.
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