Answer :

(a) Two methods of contraceptives are

Barrier: Condoms prevent the entry of sperms into the female's body and hence prevent fertilisation.


Surgical: The ducts, vas deferens and fallopian tube, can be severed in males and females respectively. Vasectomy prevents passage of sperm to the urethra and tubectomy prevents the passage of ova off the fallopian tube. This prevents fertilisation.


(b) Sexually transmitted bacterial infection: Syphilis and Gonorrhea, Sexually transmitted viral diseases: AIDS and Herpes


(c) Condoms offers the following advantage


prevents unwanted pregnancies


prevents sexually transmitted infections


OR


A.



B. Budding:



Fragmentation:



(c) . Vegetative reproduction offers the following advantages (write any one)


To grow plants like banana and orange that have lost the capacity to bear fruits


It involves single parent. This preserves the genetic and physical characteristics of the plants.


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