Can you consider cell division as a type of reproduction in unicellular organisms? Give reason. (b) What is a clone? Why do offsprings formed by asexual reproduction exhibit remarkable similarity?
(a) Can you consider cell division as a type of reproduction in unicellular organisms? Give reason.
(b) What is a clone? Why do offsprings formed by asexual reproduction exhibit remarkable similarity?
(a) Yes, because it leads to the formation two daughter cells.
(b) The new organisms produced by one parent through asexual reproduction (which are genetically identical to the parent) are called clones. The offspring’s formed by asexual reproduction exhibit remarkably similarity because the replication of DNA in the cells is done by certain biochemical reactions which synthesise more of genetic material. When the DNA already present in the nucleus of the parent cell is replicated by making more DNA at the time of asexual reproduction then slight variations come in the two copies formed. Due to this the two DNA molecules formed will be similar but not identical.
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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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