Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?

In haploid organisms that undergo sexual reproduction, name the stage in the life cycle when meiosis occurs. Give reasons for your answer.

Which kind of organism have complex mode of reproduction?

where does the sexual reproduction of malarial parasite take place in its life cycle?

Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution. Lower groups of organisms have simpler body design Asexual reproduction is common in lower groups Asexual reproduction is common in higher groups of organisms The high incicdence of sexual reproduction in angiosperms and vertebrates. Choose the correct answer from the options given below:

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: Algae are characterized by multicellular sex organs in which every cell forms the gamete. Reason: Sexual reproduction in algae is only of oogamous type.

How progeny formed from sexual reproduction have better chances of survival, why?