How do organisms reproduce Worksheet-16

How do organisms reproduce Worksheet-16

 

Subjective questions:

  1. Draw a diagram to show fertilisation in a flowering plant. Label on it:

(i) Stigma          (ii) Ovary           (iii) Polar nuclei  (iv) Egg

Define the term 'double fertilisation in plants'. After fertilisation name the part in each case which develops into (i) the fruit (ii) the seeds.

 

  1. Give two reasons for avoiding frequent pregnancies of women. Explain the following methods of contraception giving one example of each:

(i) Barrier method    (ii) Chemical method         (iii) Surgical method

 

  1. Trace the events that would take place in a flower from the time the pollen grains of the same species fall on the stigma upto the completion of fertilisation.

 

  1. Discuss briefly the different types of reproduction.

 

  1. Name two bacterial diseases which are sexually transmitted. Name their causal organisms, symptoms and preventive measures.

 

  1. What are the advantages and disadvantages of self and cross pollination? Which of them is better and why?

 

  1. What is double fertilisation? What is its significance?

 

  1. Tabulate the process of reproduction into its various types, giving one example of each type.

 

  1. Define grafting. Suggest any two advantages and disadvantages of grafting.

 

  1. Describe the anatomy of human male reproductive system.

 

  1. What is meant by tissue culture? How this technique is performed? In which area this technique is finding its application?

 

  1. Describe the human female reproductive system with the help of a labelled diagram.

 

  1. Describe the process of fertilisation in the human female.

 

  1. Discuss in brief the various modes of reproduction used by single organisms.

 

True / False:

  1. Gonorrhoea is sexually transmitted diseases.

 

  1. ferns reproduce through spores.

 

  1. Hydra regenerates from its cut body parts.

 

  1. Amoeba shows sexual reproduction.

 

Answer:

  1. True
  2. True
  3. True
  4. False