How do organisms reproduce Worksheet-13

How do organisms reproduce Worksheet-13

 

Subjective questions:

  1. What is the outcome of fertilisation? What is fertilisation known as?

 

  1. Gonads have dual functions. What are their secretions?

 

  1. State the exact functions of the fallopian tube.

 

  1. Why is the female reproductive system more complex than the male reproductive system?

 

  1. Why is it said that' sexual reproduction promotes, diversity of characters in the offsprings'?

 

  1. Draw a labelled diagram to show spore formation in Rhizopus.

 

  1. What is vegetative propagation? Classify it along with examples.

 

  1. How are these ornamental plants propagated? Mention the name of the method:

(i) Jasmine        (ii) Rose    (iii) Bougainvillea     (iv) Hibiscus

 

  1. What is the difference between the two asexual methods of reproduction - fission and fragmentation?

 

  1. How does copper-T prevent pregnancy?

 

  1. What are the different parts of stamen and pistil. Show it diagrammatically.

 

  1. Where is ovary located in human female body? What is its role?

 

  1. How do oral contraceptives work? What is their role?

 

  1. Distinguish between primary sex organ and secondary sex organ.

 

  1. Why is the number of sperms produced always more than the number of eggs produced?

 

  1. What are the functions of a flower?

 

  1. Name the method by which Amoeba reproduces. Is this method sexual or asexual?

 

  1. Write a short note on HIV/AIDS.

 

  1. What is the importance of DNA copying in reproduction?

 

  1. Why is variation beneficial to the species, but not necessarily for the individual?

 

  1. How will an organism be benefitted if it reproduces through spores?

 

  1. Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?

 

  1. What is the role of the seminal vesicles and the prostate gland?

 

  1. What are the changes seen in girls at the time of puberty?

 

  1. What are the functions performed by the testis in human beings?

 

  1. Why does menstruation occur?

 

  1. How does reproduction help in providing stability to populations of species?

 

  1. (i) What is fertilisation? Distinguish between external fertilisation and internal fertilisation.

(ii) What is the site of fertilisation in human beings?

 

  1. Define the terms unisexual and bisexual giving one example of each.

 

  1. Explain double fertilisation in plants.