A. Choose the correct alternatives and rewrite the complete sentences :
1. Resemblance and differences is the result of ..................... .
(a) heredity (b) fertilization (c) evolution (d) selection
2. The quantity of hormones produced by the plants depends upon the
efficiency of the concerned ..................... .
(a) chromosome (b) enzyme (c) gene (d) DNA
3. In human beings there are ..................... chromosomes.
(a) 46 (b) 23 (c) 52 (d) 24
4. The theory of natural selection was proposed by ..................... .
(a) Mendel (b) Lamarck (c) Charles Darwin (d) Robert Hooke
5. A systematic study of fossils and its occurence revealed that the deepest
layers were found to have fossils of ..................... .
(a) vertebrates (b) invertebrates (c) ambhibians (d) plants
6. ..................... is a connecting link between annelida and arthropoda.
(a) Peripatus (b) Cockroach (c) Crab (d) Earthworm
7. Inheritance of acquired characteristics is also called ..................... inheritance.
(a) hard (b) soft (c) acquired (d) crisscross
Answers.
1. Heredity
2. Enzyme
3. 46
4. Charles Darwin
5. Invertebrates
6. Peripatus
7. Soft
B. Fill in the blanks :
*1. In ..................... mode of reproduction, the offsprings are with minor differences.
*2. Both the parents contribute equal amount of ..................... material to the offspring.
*3. Dominant character masks the ..................... character.
*4. Selection by nature is not ..................... but ..................... .
5. Mendel’s experiments were based on a number of visible contrasting
characters of garden peas ..................... .
6. A fragment of DNA that provides complete information about one protein is
known as the ..................... for that protein.
7. All children inherit ..................... chromosome from their mother.
8. Sex determination in human beings is ..................... .
9. ..................... are collected from different levels of depths.
10. Minor differences occur in asexual reproduction due to inaccuracies
occuring in .....................
Answers
1. Asexual
2. Genetic
3. Recessive
4. Deliberate, natural
5. Pisum sativum
6. Gene
7. X
8. Genetical
9. Fossils
10. DNA copying
