1. Offspring formed as a result of sexual reproduction exhibit more variations because-
A. sexual reproduction is a lengthy process
B. genetic material comes from two parents of the same species
C. genetic material comes from two parents of different species
D. genetic material comes from many parents
2. Reproduction is essential for living organisms in order to-
A. keeps the individual organism alive
B. fulfill their energy requirement
C. maintain growth
D. continue the species generation after generation
3. In human females, an event that reflects onset of reproductive phase is-
A. menstruation
B. change in voice
C. changes in hair pattern
D. growth of body
4. In human males, the testes lie in the scrotum, because it helps in the –
A. process of mating
B. formation of sperm
C. easy transfer of gametes
D. all of the above
5. The correct sequence of organs in the male reproductive system for transport of sperms is –
A. testis→vasdeferens→urethra
B. testis→ureter→urethra
C. testis→ urethra→ureter
D. testis→ vasdeferens→ ureter
6. Which one of the following is an artificial ecosystem?
A. lake
B. forest
C. crop field
D. pond
7. In a food chain, the third trophic level is always occupied by –
A. carnivores
B. producers
C. herbivores
D. decomposers
8. Length of pollen tube depends on the distance between –
A. upper surface of stigma and lower part of style
B. pollen grains in anther and upper surface of stigma
C. pollen grains and upper surface of stigma
D. pollen grains on upper surface of stigma and ovule
9. In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of-
A. light energy
B. heat energy
C. mechanical energy
D. chemical energy
10. Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the-
A. food web
B. food chain
C. ecosystem
D. ecological pyramid
