Heredity and evolution Worksheet-20

Heredity and evolution Worksheet-20

True / False:

21. Tendrils of cucurbita and thorns of bougainvillea are analogous structures.

22. Platypus is a connecting link between aves and mammals.

23. Exoskeleton of feathers was first evolved in aves.

24. All unicellular eukaryotic organisms are placed in monera.

25. Evolution leads to the generation of complex organisms.

26. The new species formed are better then the existing ones.

27. Human beings first originated in America.

28. Recessive trait is a genetic trait that is expressed only when two copies of the gene are present.

29. Cell having two sets of chromosomes, one of paternal origin and the other of maternal origin is a haploid cell.

30. Gene is the unit of inheritance.

31. Mendal proposed the theory of natural selection.

32. Forelimbs of a frog is example of animals having analogous organs.

33. According to Darwin evolution took place due to natural selection.

34. Tissue is the basic unit of life in all organisms.

35. 'Older fossils are found closer to the surface'

Answer:

21. False

Explanation: Tendrils of cucurbita and thorns of bougainvillea are homologous structures

22. True

23. False

Explanation: Exoskeleton of feathers was first evolved in reptiles-dinosaurs

24. False

Explanation: All unicellular eukaryotic organisms are placed in protista

25. True

26. False

Explanation: The new species formed are better adapted to the environment, but they need not be superior to the existing species

27. False

Explanation: Human beings first originated in Africa

28. True

29. False

Explanation: Cell having two sets of chromosomes, one of paternal origin and the other of maternal origin is a diploid cell

30. True

31. False

32. False

33. True

34. False

35. False