Name the method by which bread mould (Rhizopus fungus) reproduces. Is this method sexual or asexual? (b) What is yeast? Describe the process of reproduction in yeast with the help of labelled diagrams.
(a) Name the method by which bread mould (Rhizopus fungus) reproduces. Is this method sexual or asexual?
(b) What is yeast? Describe the process of reproduction in yeast with the help of labelled diagrams.
(c) Name a tiny fresh-water animal which reproduces by the same method as that of yeast? What is this method known as?
(d) Name two marine organisms which also reproduce by the same method as yeast but form colonies.
(a) Spore formation; asexual reproduction.
(b) Yeast is tiny, unicellular non green plant which reproduces by budding. In yeast, first a bud appears on the outside of the cell wall. The nucleus of the parent yeast cell divides into two parts and one part of the nucleus moves into the bud. Ultimately, the bud separates off from the parent yeast cell and forms a new yeast cell.
(c) Hydra; Budding.
(d) Sponge and corals.
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What is ovulation? How often does it happen in human females ? (b) Where does fertilisation take place in human females? (c) Explain why, fertilisation is possible if mating takes place during the middle of menstrual cycle.
3 years ago
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What changes are seen in girls at the time of puberty? (b) Name the organs which produce ova (or egg cells) in human females. (c) Draw a labelled diagram of the human female reproductive system.
3 years ago
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What changes are seen in boys at the time of puberty? (b) Name the organs which produce sperms in human males. (c) Draw a labelled diagram of the human male reproductive system.
3 years ago
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Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel. (b) What name is given to (i) all the petals of a flower, and (ii) all the sepals of a flower?
3 years ago
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What is meant by ‘unisexual flowers’ and ‘bisexual flowers’? Give two examples of each. (b) What is pollination? How does pollination occur?
3 years ago
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