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Science · 2023 · 4 marks
CBSE 2023 · Region 2 · Set 1 · Q38
All the reproductive methods of living organisms are broadly categorized into two types: 1. Asexual reproduction, and 2. Sexual reproduction. Asexual…
All the reproductive methods of living organisms are broadly categorized into two types: 1. Asexual reproduction, and 2. Sexual reproduction. Asexual reproduction involves the participation of a single parent without the formation of gametes, fertilisation and transfer of genetic material. This method is a common means of rapidly increasing offsprings under favourable conditions.
(a)
Name the type of fission that occurs in Leishmania and Plasmodium.
(b)
Write one advantage of sexual mode of reproduction over asexual reproduction.
(c)
Give reasons why :
(i)
Colonies of yeast fail to multiply in water but multiply in sugar solution.
(ii)
Rhizopus individuals do not grow on a dry slice of bread.
OR
(c)
Name the filamentous structures a student could identify when he collected water from a pond that appeared dark green. How do these organisms multiply? Explain.
Marking-scheme solution
(a)
Leishmania - Binary fission ; Plasmodium - Multiple fission
(b)
Sexual reproduction leads to more variations which are useful for ensuring the survival of a species.
(c)(i)
sugar solution provides nutrients for growth and multiplication whereas water does not do.
(ii)
Moisture is required for the growth of Rhizopus.
OR
(c)
• Spirogyra
Fragmentation - Spirogyra simply breaks up into smaller pieces upon maturation. Each piece grows into a new individual.
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.