How do organism reproduce online mcq quiz
How do organism reproduce boostup points
➲ Asexual Reproduction in Plants
☞ Spore formation → Example: Bacteria, fungi
☞ Budding → Example: Fungi (yeast)
☞ Fragmentation → Example: Algae, fungi.
☞ Vegetative propagation
➲ Natural method
☞ By roots → Example:Sweet potato.
☞ By stems → Example:Ginger, potato.
☞ By leaves → Example: Bryophyllum.
➲ Artificial method
☞ Cutting → Example:Rose.
☞ Layering → Example:Strawberry, lemon.
☞ Grafting → Example:Mango, rose.
☞ Micropropagation → Example:Orchids, dahlia
➲ Sexual Reproduction in Plants
☞ Flower is the reproductive organ.
☞ It has four whorls – Calyx, Corolla, Androecium, Gynoecuim.
☞ Calyx and corolla are accessory parts.
☞ Androecium - Male reproductive organ producing pollen grains.
☞ Gynoecium - Female reproductive organ having ovule (egg).
☞ Pollination – Transfer of pollens from anther to stigma for fertilization.
☞ Fertilization – Fusion of male and female gametes.
☞ Double fertilization (Triple fusion and syngamy) – unique events in the embryo sac of ovules.
➲ Asexual Reproduction in Animals
☞ Fission
Binary fission → Example:. Amoeba
Multiple fission → Example:Plasmodium
☞ Budding → Example:. Hydra
☞ Regeneration → Example:Planaria, Hydra
➲ Sexual Reproduction (Human)
☞ Human being is heterosexual.
☞ Reproductive system includes:
Primary sex organs: Testes (males) and ovaries (females)
Secondary sex organs: Genital ducts and glands (males) and fallopian tubes, uterus, vagina (females)
☞ Male sex hormone is testosterone and female sex hormones are progesterone and estrogen.
☞ Puberty is attained at the age of 13 – 14 years in males and 10 – 12 years in females.
☞The zygote formed after fertilization develops into embryo which gets implanted in uterus.
☞ Placenta (a disc-like special tissue) develops between uterine wall and embryo for nourishment of the embryo.
☞ Gestation period in humans is 280 days.
➲ Reproductive Health
☞ Birth control prevents unwanted pregnancies.
Barrier methods
Chemical methods
Intrauterine contraceptive device
Surgical method
☞ Sexually transmitted diseases (STD) are caused by bacteria, protozoa and viruses.
☞ AIDS is an incurable viral disease.
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