Class 12th Biology 2016 Set3 Outside Delhi Board Paper Solution
Explain Parasitism and co-evolution with the help of one example of each.
Parasitism :
Mode of interaction between two species in which one species (parasite) depends on the other species (host) for food and shelter. In this one organism is benefitted, the other is harmed.
Example: Human liver fluke / Malarial parasite / Cuscuta
Co-evolution:
It is the relationship between two interacting organi sms where both organisms failed to survive in the absence of the other.
Example: Fig and fig wasp / ophrys and bumble bee
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Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________. - Q:- Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?