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THE CHAPTER - REPRODUCTION
CLASS 12
BIOLOGY
Answers
Answer:
Explanation:
(1) 12 YEARS.
(2) MONOECIOUS [ BOTH MALE AND FEMALE FLOWER ARE BORN ON THE SAME PLANT]
(3) ALWAYS DIPLOID.
(4) BISEXUAL [ BOTH TESTIS AND OVARY PRESENT IN THE SAME INDIVIDUAL]
(5) [A] IT IS NOT BECAUSE OF THAT THE PLANT IS NOT HEALTHY OR UNDER STRESS. IT IS A NATURAL PHENOMENON THAT THE FLOWERS THAT ARE NOT POLLINATED GET NATURALLY ABORTEDAND ARE NOT ABLE TO PRODUCE FRUITS . HENCE ALL PAPAYA PLANTS DONOT GET FRUITS.
[B] SOME ALGAE PRODUCE MOTILE GAMEETES BECAUSE THEY NEED WATER ENVIRONMENT FOR FERTILISATION . THEY PRODUCE LARGE AMOUNT OF GAMEETES BECAUSE SINCE THAY DEPEND ON EXTERNAL FERTILISATION , THE CHANCES OF GETTING FERTILISED IS VERY POOR . TO OVER COME THIS , A LARGE NUMBER OF GAMEETES ARE PRODUCED.
[C] THESE ALGAE DEPEND ON EXTERNAL FERTILISATION AND INORDER TO INCREASE THE CHANCES OF GETTING FERTILISED MORE MALE GAMEETES ARE PRODUCED.
(6) [A]
1. PRE FERTILISATION EVENTS.
2. FERTLISATION.
3. POST FERTILISATION.
[B] 1. GAMETOGENESIS.
2. GAMEETE TRANSFER.
HOPE THIS HELPS.