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Although sexual reproduction is a long d...

Although sexual reproduction is a long drawn, energy-intensive complex form of reproduction, many groups of organisms in kingdom- Animalia and Plantae prefer this mode of reproduction. Give atleast three resaons for this.

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(a) Sexual reproduction brings about variation in the offspring
(b) Since gamete formation is preceded by meiosis, genetic recombination
occurring during crossing over (meiosis - ). leads to a great deal variation in the DNA of gametes.
(c) The organism has better chances survival in a changing environment Embryo sacs of some apomictic species appear normal but conta diploid cells. Suggest a suitable explanation for the condition.
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TRUEMAN BIOLOGY-REPRODUCTION-SECTION-D
  1. When and where in the body is oogenesis completed?

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  2. (a) How is the placenta connected to the embryo? (b ) Placenta acts ...

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  3. Give reasons why: (i) Most zygotes in angiosperms divide only afte...

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  4. 2 difference between cross pollination and self pollination

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  5. Draw a labelled diagram of the structure of mature dicot embryo.

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  6. (a ) Draw a labelled longisectional view of an albuminous 'seed'·

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  7. Describe the post-zygotic events leading to implantation and placenta ...

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  8. Although sexual reproduction is a long drawn, energy-intensive complex...

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  9. Embryo sacs of some apomitic species appear normal but contain diploid...

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  10. Meiotic division during oogenesis is different from that in spermatoge...

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  11. Enumerate and describe any five reasons for introducing sex education ...

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  12. The following is the illustration of the sequence of ovarian events (a...

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  13. Describe the stage in embryo development in a dicot plant.

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  14. Where is morula formed in humans? Explain the process of its developme...

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  15. Mention the fate of all the components of the embryo sac after fertili...

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  16. (a) Draw a diagrammatic sectional view of a mature anatropous ovule an...

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  17. (a) Draw a diagrammatic sectional view of the female reproductive syst...

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  18. (a) Draw a labelled schematic diagram of the transverse section of a m...

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  19. Write two differences between spermtogenesis and oogenesis

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  20. (a) Draw a diagram of a mature embryo sac of an angiosperm and label t...

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