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51.

Following table summarises the differences between self-fertilisation and cross-fertilisation. Pick out the wrong difference.A. `{:("Self-fertilisation","Cross-fertilisation"), (" It is uniparental.", "It is biparental."):}`B. `{:("Self-fertilisation","Cross-fertilisation"), (" It involves the fusion of male and female gametes of the same parent.", "It involves the fusion of two gametes produces by different parents."):}`C. `{:("Self-fertilisation","Cross-fertilisation"), ("Examples : Pheretima, Periplaneta", "Examples : Taenia, Rana tigrina"):}`D. None of the above.

Answer» Correct Answer - c
Self-ferlisation occurs in Taenia, while cross=-fertilisation occurs in Pheretime, periplaneta and Rana tigrina.
Discussion
52.

Assertion : Asexual reproduction involves formation of clones of an organism. Reason : Clones are morphologically and genetically similar individuals.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - b
When an offspring is produced by a single parent without the involvement of gamete formation, the reproduction is called asexual reproduction. As a result, the offspring produced are not only similar to one another but are also exact copies of their parent. Such a group of morphologically and genetically similar individuals are called clones.
Discussion
53.

Which of the following is an incorrect combination of organism with iots chromosome number in meiocyte and in ganete ?A. `{:("Name of organism", "Chromosome number in meiocyte", "Chromosome number in gamete"),("Onion", " "24, " "12):}`B. `{:("Name of organism", "Chromosome number in meiocyte", "Chromosome number in gamete"),("Ophioglossum", " "1260, " "630):}`C. `{:("Name of organism", "Chromosome number in meiocyte", "Chromosome number in gamete"),("Human beings", " "46, " "23):}`D. `{:("Name of organism", "Chromosome number in meiocyte", "Chromosome number in gamete"),("Fruit fly", " "8, " "4):}`

Answer» Correct Answer - a
Chromosome number in meiocyte (2n) of onion cell is 32, while chromosome number in gamete (n) is 16.
Discussion
54.

In maize, a meiocyte has 20 chromosomes. What will be the number of chromosomes in its somatic cell ?A. 40B. 30C. 20D. 10

Answer» Correct Answer - c
The germinal cells are diploid and act as meiocytes, which undergo meiosis to produce haploid gametes. Thus, meiocytes have diploid (2n) number of chromosomes, same as the somatic cells.
Discussion
55.

It is observed that simple organisms like algae and fungi normally reproduce asexually but before the onset of adverse conditions they shift to sexual reprodction, It is so because sexual reproductionA. sexual, asexual, sexualB. asexual, sexual, asexualC. asexual, sexual, sexualD. sexual, asexul, asexual

Answer» Correct Answer - c
Discussion