Available Answers

1. 1.

   State if the following statements are true or false. Correct the statement if it is false.

   1.  Asexual reproduction involves the fusion of male and female sex cells.
   2.  Budding, binary fission and fragmentation are types of sexual reproduction.
   3.  Binary fission is seen in organisms like Amoeba and Paramecium.
   4.  Euglena reproduces by budding and regeneration.
   5.  Flatworms reproduce by budding.
2. 2.

   Fill in the blanks.

   1. The general age for onset of puberty in females is _______________ years while in males it is _______________ years.
   2. The male gametes are produced in _________________.
   3.  Human fertilization occurs in the _______________ and the baby develops in the ______________.
   4. The time between fertilization and birth is called _____________.
   5.  _________________ starts from birth and lasts till about two years of age.
   6. The period between 11 and 18 years of age is referred to as ____________.
3. 3.

   Tick the most appropriate answer.

   1. The number of sexes needed in sexual reproduction is
      1. one
      2. three
      3. none
      4. two
   2. Flatworms reproduce asexually by
      1. budding
      2. binary fission
      3. fragmentation
      4. spores
   3. External fertilization occurs mostly in
      1. human beings
      2. frogs
      3. snakes
      4. birds
   4. Sperms are produced by
      1. urethra
      2. ureter
      3. testes
      4. ovaries
   5. Testes are present in a sac called
      1. sternum
      2. scrotum
      3. sperm duct
      4. semen
   6. The sperms reach the urethra by travelling through the
      1. scrotum
      2. testes
      3. sperm duct
      4. vagina
   7. The release of an egg from an ovary is called
      1. fertilization
      2. menopause
      3. menstruation
      4. ovulation
   8. From the third week of development till the end of the second month of pregnancy, the developing organism is called
      1. infant
      2. embryo
      3. foetus
      4. zygote
   9. The embryo is attached to the uterus by a special structure called
      1. amnion
      2. placenta
      3. stalk
      4. oviduct
   10. The female sex hormones secreted by the ovaries are
       1. progesterone and testosterone
       2. progesterone and oestrogen
       3. thyroxine and testosterone
       4. oestrogen and testosterone
4. 4.

   Fill in the blanks.

   1.  _______________ is the common method of reproduction in Hydra.
   2.  The most common form of asexual reproduction in starfishes is _______________.
   3.  When an ovum fuses with a sperm outside the body, it is called ______________.
   4.  Testes produce male sex hormone called _____________.
   5.  A _____________________ is the larval stage of butterfly.
5. 5.

   Define ovulation.

6. 6.

   Define menstruation.