Download II-TERM QUESTION BANK (2016-17) Std: X Sub: Biology Topic : 1

II-TERM QUESTION BANK
(2016-17)
Std: X
Sub: Biology
Topic : 1) Heredity and evolution
2) How do organisms reproduce?
1 Mark
1. What is speciation?
2. What is genetic drift?
3. Define variation in relation to species. Why is variation beneficial to species?
4. Name the information source for making proteins in cell.
5. What is gene?
6. Mention any two recessive traits in garden pea?
7. Name an organism in which sex determination is regulated by environmental factor.
8. What is chemical nature of gene?
9. Give two examples of vestigial organs present in human body.
10. Name the plant on which Mendel performed his experiment.
11. What are acquired traits?
12.What are fossils?
13. Define heredity.
14. What will be the sex of offspring if a human sperm having X chromosome fertilizes an egg?
2 Marks
1. Why are acquired traits not inheritable?
2. Why mendel selected garden pea plant for his experiment?
3. How is equal contribution of male and female parent is ensured in progeny?
4. Differentiate between inherit and acquired traits giving an example each.
5. Why are thorn of bougainvillea plant and tendril of passiflora plant considered homologous
organs?
6. Give reasons:
1) All organisms have many common features.
2) Fossils furnish the direct and most reliable evidence for evolution.
7. How does the creation of variation in a species promote survival?
8. Only variation that confers an advantage to an individual organism will survive in
population.”Comment on the statement.
9. Do genetic combination of mother play an important role in determining sex of a new born?
Explain.
10. How do genes control a character?
11. The forelimbs of human, bird, lizard and frog, when studied in detail, show the same
structure of bones and point towards a common origin.
1) What do you conclude from this?
2) What is the term given to such structures?
12. What factors could lead to the rise of new species?
13.”The chromosome number of the sexually reproducing parents and their offspring is same”
Justify this statement.
14. What are fossils? What do they tell us about the process of evolution?
15. Why small numbers of surviving tigers a cause of worry from the point of view of genetics?
3 Marks
1. Explain origin of species on the basis of theory of natural selection.
2. Describe any three ways in which individuals with a particular trait may increase in
population.
3. State the evidence we have for the origin of life from inanimate matter.
4. Explain with examples how the following are the evidences in favor of evolution in
organisms.
a) Homologous organs
b) Analogous organs
c) Fossils
5. “An individual cannot pass on to its progeny the experiences of its life time.”Justify the
statement with the help of an example and also give reason for same.
6. 1) We see eyes in planeria, Insects, octopus and vertebrates. Can eyes be grouped together in
case of the above mentioned animals to establish a common evolutionary origin? Why?
2) State one evidence to prove that birds have evolved from reptiles.
7. A blue colour flower plant denoted by BB is crossbred with that of white colour flower plant
denoted by bb.
a) State the colour of flower you would expect in their F1 generation plants.
b) What must be the percentage of white flower plant in F2 generation if flowers of F1 plants are
self pollinated?
c) State the expected ratio of the genotypes BB and Bb in the F2 progeny.
8. How are fossils formed? Describe, in brief, two methods of determining the age of fossils.
9. Variation is beneficial for species but not necessarily for individual, Give three reasons to
justify this.
10. What is meant by the term speciation? List four factors which could lead to speciation.
11. A pea plant always bears yellow and round seed while another plant always with green,
wrinkled seeds. What will be outcome in F1 and F2 generations?
12. Who proposed the theory of natural selection? Explain the theory briefly.
5 marks
1 .The sex of a child is a matter of chance and none of the parents may be considered responsible
for it. Justify this statement with the help of flow chart showing determination of sex of newborn.
2. How do Mendel’s experiment show that traits are inherited independently?
3.What are different methods of contraception?
4. How does sexual reproduction in plants take place?
5. Explain female reproductive system with the help of diagram.