How do organisms reproduce Worksheet-8
Subjective questions:
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What happens to the ovule and the ovary after fertilisation?
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What is the function of micropyle?
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What is the end product of double fertilisation?
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Name two organisms in which multiple fission occurs.
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Name the artificial methods of vegetative propagation.
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What is stock in grafting?
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Name the agencies through which cross-pollination take place.
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Name the plant where vegetative reproduction occurs through roots.
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Name two abiotic agents of pollination.
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Name a plant whose intact leaves produce plantlets along the margin.
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Give one example of a plant showing vegetative propagation by leaves.
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Which group of plants shows double fertilisation?
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Name some ornamental plants which are commercially multiplied by micropropagation.
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What is the main difference between stem cutting and layering?
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What is the technical term given to the stalk of the flower?
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What is the age of puberty in human females?
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Where are sperms formed?
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Why testis in man are extra-abdominal in position?
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Name the most sensitive part of the penis.
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Name the part of the male reproductive system which carries both sperms and urine.
Answer:
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After fertilisation ovule changes to seed and ovary to fruit.
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The micropyle opening serves as a passage for the entry of the pollen tube into the ovule.
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Seeds and fruits.
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Malarial parasite and monocystis.
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Cutting, layering and grafting.
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Rooted plant is called stock.
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Water, wind, insects, birds and man.
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Sweet potato.
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Wind and water.
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Bryophyllum.
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Bryophyllum.
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Angiosperms (Flowering plants).
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Orchids, Gladioli, Carnation and Chrysanthemum.
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In stem cutting, rooting occurs after the stem is detached from the parent plant; whereas in layering, roots are induced before the stem is separated from the parent plant.
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Pedicel.
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10-12 years.
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Sperrhs are formed in testes.
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Testis arcpresent outside the abdomen because sperms need lower temperature for their survival.
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Urethra.
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Penis.
