The name of the meristem that ultimately gives rise to secondary xylem and phloem is the
A. vascular cambium.
B. cork cambium.
C. intercalary meristems.
D. ground meristem.
E. primary meristem.
A. vascular cambium.
Vascular cambium is one of two types of lateral meristems in woody tissues. The cork cambium contributes to the outer bark while the vascular cambium, as its name suggests, generates vascular tissues. Please read Section 36.1 for more information on meristems.
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The region of the human brain is that is critically important for monitoring and controlling movements is the
A. medulla oblongata. B. cerebellum. C. hypothalamus. D. basal nuclei. E. cerebral cortex.
If a normal diploid germ cell in a bird has eight chromosomes, then ______
a. there are eight homologous pairs of chromosomes per diploid germ cell b. there are eight chromatids per diploid germ cell after DNA replication c. there are four chromosomes per cell after the first meiotic division and cytokinesis d. there are eight chromosomes in the sperm cells made from this diploid germ cell e. there are eight copies of each chromosome in this diploid germ cell
The exchange of gases with the respiratory
medium by animals is called breathing, whether the medium is air or water.
1.True 2.FalseWhich of the following is generally accepted as the origin of living organisms?
a. Life was seeded on Earth from some distant place by meteorites and comets crashing into Earth. b. Spontaneous generation c. Life originated from an oxygen-rich atmosphere on Earth. d. Life can originate from nonliving matter. e. Prebiotic chemical evolution gave rise to progressively more complex molecules and eventually to living organisms