SEXUAL REPRODUCTION (PART-1)

                                      

STD-12      UNIT-6   CHA-1

REPRODUCTION IN ORGANISMS 

SEXUAL REPRODUCTION (PART-1)

SEXUAL REPRODUCTION - development of new individual throughout the formation and fusion of gametes.

SEXUALITY IN PLANT 

Sexually reproductive organ is flower 

One flower has both male and female reproductive parts this plant known as Bisexual flower eg- Hibiscus and China rose 

If one flower has only male reproductive part (staminate flower) or only female reproductive (Pistillate flowers) its know as unisexual flower 

One plant having both sex organs this plant known as monoecious eg- Maize,Coconut

One plant having only male and female sex oragan such plant known as Dioecious eg- Palm, Papaya. 

China rose   

  MAIZ 

 PAPAYA 

             

1) MONOCARPIC PLANTS - 

These plants flowers only once in their life after flowering they produce fruits and die all annual (e.g wheat ,rice)

Bamboo species ( Bambusa tulda) flower only ones their life time, usually after 50-100 years. They produce large number of fruits and they die.

Strobilanthus Kunthiana ( Neelakuranhi) flowers one's in 12 years 

Its found in Kerala, Karnataka and Tamil Nadu 

Bambusa tulda

Strobilanthus Kunthiana

           

2) POLYCARPIC PLANT 

These plants are perennial and flowers repeatedly at interval every year e.g- apple ,mango, Orange  

very few perennial plants have a flowers throughout the year e.g China rose

SEXUALITY IN ANIMALS 

Some lower animals both male and female sex organs are present in the same individual such animals are called as a hermaphrodite monoecious or bisexual e.g- Tapeworm, Fasciola, Earthworm,Leech.

Most of animals are unisexual or Dioecious with the distinct male and female individual, e.g Ascaris, Cockroach, Frog, Lizard ,Birds, Mammals.

Fasciola

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Manish Mevada

M.Sc, M.Phil, B.Ed

INDIA BIOLOGY NEET

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