22. Paleozoic era started-million years ago A) 65.5 B)4000 C)542 D) 251 23. Plan

Question

22. Paleozoic era started-million years ago A) 65.5 B)4000 C)542 D) 251 23. Plant species A has 10 and plant species B has 12 chromosomes. A new species Cis formed by allopolyploidy from species A and B. The diploid number of species C is likely to be A) 24 B) 22, C) 28 D) 26 24. After separation from chimpanzee line first hominin in human phylogeny is A) Australopithecus africanus B) Australopithecus afarensis C) Ardipithecus ramidus D) Homo habilis 25. What is not a source of variations A) recombination B) gene flow C)mutation Djindependent assortment 26. The smallest cells without cell walls are present in A) cyanobacteria B) mycoplasmas C) chlamydias D) actinomycetes

Explanation / Answer

22. Option C is correct.
Paleozoic era started 358.9 (+/- 0.4) million years ago.

23. Option B is correct.
Parents: 10 X 12
Progeny: 5+6 = 11
Allopolyploid = 11 X 2 = 22

24. Option C is correct.
Ardipithecus is the first hominin in human phylogeny after separation from chimpanzees

25. All the given options can contribute to variation.

26. Option B is correct.
Mycoplasma is the smallest cell-wall-less organism.

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