How do organisms reproduce Worksheet-12

How do organisms reproduce Worksheet-12


Subjective questions:

  1. Justify the statement 'Primary sex organs control the growth, function and maintenance of secondary sex organs'.


  1. Mention the functions performed by the secretions of the accessory/secondary sex glands in human males.


  1. What are the functions of a flower?


  1. Differentiate between ovum and zygote.


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


  1. Differentiate between ovulation and menstruation.


  1. Differentiate between stock and scion in grafting.


  1. Why is cross-pollination considered to be superior than the self-pollination?


  1. Distinguish between male and female reproductive duct system in humans.


  1. Give the basic features of asexual reproduction.


  1. Give the basic features of sexual reproduction.


  1. List two main advantages of sexual reproduction.


  1. Why does sterility result if testes are retained in the abdomen?


  1. Define menstruation. Why is menstrual cycle so called?


  1. What do you mean by internal fertilisation and external fertilisation?


  1. What is the importance of parthenogenesis?


  1. 'Grafting is a common method of obtaining a superior plant from two different plants'. Explain.


  1. Give the differences between gestation and parturition.


  1. Differentiate between foetus and embryo.


  1. Differentiate between ureter and urethra in man.


  1. What is placenta? State its functions.


  1. What is the significance of human testes being located in the scrotum?


  1. How does sexual reproduction takes place in human?


  1. Describe about the different parts of a stamen in male reproductive organ of a plant.


  1. Name the causal organism of

(a) Syphilis        (b) Gonorrhoea.


  1. Why does some multicellular organisms cannot divide cell-by-cell?


  1. How the surgery methods are misused by people to prevent pregnancy?


  1. What is sex ratio?


  1. How is population size maintained by reproduction?


  1. What are the two types of reproduction? How are they different from one another?