Why might you argue that swimming sperm in gymnosperms is not a highly adaptive trait?
What will be an ideal response?
While two gymnosperm phyla have retained the ancestral trait of swimming sperm, Cycadophyta and
Ginkophyta, these phyla are very species poor, not particularly dominant in any habitat like, for
example, pines, and are not the probable closest group to angiosperms. There are 185 extant species of
cycads. There is only one species within the phylum Ginkophyta.
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Why was it not possible to classify viruses by morphology when they were initially discovered?
a. Initially, their morphology could change during infections. b. Once inside the host, they replicate too quickly to be inspected for discernable shape. c. They are too small to be seen with a standard microscope. d. So many of them have identical morphology but different hosts and modes
The hypothesis that mitochondria and chloroplasts originated from the phagocytic activity of
prokaryotes that was not followed by digestion is called the
a. theory of natural selection. b. endosymbiotic hypothesis. c. ribozymes-first hypothesis d. Oparin-Haldane hypothesis. e. stromatolite hypothesis
There are __________ autosomes present in a human egg. What will be an ideal response?
Coxiella burnetii is transmitted to humans mainly via the bite of infected tick vectors.
Answer the following statement true (T) or false (F)