During human embryonic development, the formation of the primitive streak marks a crucial step. Which of the following statements regarding the primitive streak is INCORRECT?
It marks the beginning of gastrulation.
It defines the embryo's axes.
It is the source of mesoderm and endoderm.
It persists throughout development.
Related Questions
Double fertilization is a characteristic feature of:
Gymnosperms
Angiosperms
Pteridophytes
Bryophytes
Which of the following is NOT a characteristic of the lag phase in a bacterial growth curve?
Intense metabolic activity
Rapid cell division
Adaptation to the environment
Increase in cell size
Which extraembryonic membrane in mammals is involved in the formation of the placenta?
Amnion
Yolk sac
Allantois
Chorion
During oogenesis in mammals, polar bodies are formed. Which statement best describes the function of polar bodies?
To provide nutrients to the developing oocyte.
To allow for the reduction of chromosome number while retaining most of the cytoplasm in the oocyte.
To initiate the process of fertilization.
To guide the sperm towards the oocyte.
The cells proximal (just next away from the tip) to the meristematic zone represents the phase of
Division
Maturation
Elongation
Meristematic division
The transformation of a larva into an adult through drastic changes is termed:
Embryogenesis
Gametogenesis
Regeneration
Metamorphosis
The transformation of a larva into an adult through drastic changes is called:
Moulting
Metamorphosis
Regeneration
Growth
The development of interfascicular cambium from mature parenchyma cells between vascular bundles exemplifies:
Redifferentiation
Differentiation
Dedifferentiation
Plasticity
The process of development of fruits without fertilization is called:
Polyembryony
Apomixis
Parthenogenesis
Parthenocarpy
In plants, the conversion of permanent tissues like parenchyma to meristematic tissue like interfascicular cambium is an example of:
Redifferentiation
Differentiation
Dedifferentiation
Senescence
