How do organisms reproduce Worksheet-7
Subjective questions:
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Write names of one male and one female sex hormone.
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Name the kind of reproduction in bee in which drones are produced.
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Which parts of plants can grow vegetatively?
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What is the function of pollen grains in flowers?
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What is the other name of (i) Calyx (ii) Corolla (iii) Androecium (iv) Gynoecium?
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What is the basic requirement for sexual reproduction?
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Name two organisms that show asexual reproduction.
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What is the difference between binary and multiple fission?
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How does hydra reproduce? Name another organism that reproduces by the similar method.
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Name two plants other than fungi that reproduce through spores.
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Why is regeneration considered a method of reproduction?
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Give two examples of organisms which can regenerate from small part of their body.
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Give one example of an organism which reproduces asexually by budding.
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Name two body parts which human beings can regenerate.
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Give one example of each plant which propagates artificially by
(a) cutting (b) layering.
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Name the process of reproduction in the following organisms
(a) Euglena (b) Rhizopus.
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Give one example of each of the following :
(i) Plant which reproduces naturally by vegetative propagation of leaf.
(ii) Plant which reproduces naturally by vegetative propagation of stem.
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Give the terms for the pollination by winds and bats.
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Which vegetative part is used in the propagation of Bryophyllum?
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Name some plants where layering is used as a method of propagation.
Answer:
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Male sex hormone is Testosterone and female sex hormone is Estrogen.
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Parthenogenesis.
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Modified stems like onion bulbs, runners of doob grass, ginger rhizomes, potato tubers and root tubers of sweet potato, dahlia can grow into new plants - stem cuttings like sugarcane, rose, etc., grow into a new plant provided they have buds. Grafting of fruit trees branches grow into a plant.
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Pollen grains fertilises the egg cell present in the embryo sac of an ovule.
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(i) Calyx – Sepals
(ii) Corolla –Petals
(iii) Androecium – Stamens
(iv) Gynoecium – Pistil/Carpel.
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The basic requirements for sexual reproduction are two gametes, male and female gametes which are usually different from one another.
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Amoeba and yeast.
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In binary fission, two new organisms are formed from the single unicellular organism and in multiple fission, several individuals arise from a single unice 1 lular organism.
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Hydra reproduces by budding. Another organism that reproduces through budding is Yeast.
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Mushroom and ferns.
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Regeneration is considered a method of reproduction because an entire organism can be made from its fragmented body.
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Planaria and Spirogyra.
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Hydra.
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Hairs and nails.
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(a) cutting e.g., rose.
(b) layering e.g., jasmine.
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(a) Euglena - Binary fission. (b) Rhizopus - Spore formation.
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(i) Bryophyllum. (ii) Potato (tuber).
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Wind pollination - Anemophily. Bat pollination - Chiropterophily.
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Vegetative part of leaf is used in the propagation of Bryophyllum.
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Jasmine, Hibiscus, Lemon, Guava, etc.