The vegetative propagule of Bryophyllum is:
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Explanation
Read page 7, XII NCERT
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Water hyacinth is one of the most invasive weeds primarily because:
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Explanation
Read page 8, XII NCERT
The number of chromosomes in a meiocyte of the fruit fly is:
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Explanation
Read page 13, Table 1.1, XII, NCERT
Ginger is vegetatively propagated through:
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Explanation
Read page 7, Fig. 1.4, XII NCERT
Rotifers:
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Explanation
Page 14, XII NCERT
Some rotifer species consist only of females that producetheir daughters from unfertilized eggs, a type of reproduction called parthenogenesis. In other words, these parthenogenic species can develop from an unfertilized egg, asexually.
Which one of the following generates new genetic combinations leading to variation?
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Explanation
The sexual reproduction brings about variation through genetic recombinations.
First of all genetic recombination occurs in non-homologous chromosomes during crossing over of pachytene stage in meiotic cell division.
Secondly, the random union of gametes also contributes in forming new combinations of characters. Other options (1) (2) and (4) do not contribute in the formation of proganies with new variations.
Vegetative reproduction occurs through vegetative parts of organisms (plants). Parthenogenesis is formation of new individual without fertilisation.
The 'Eyes' of the potato tuber are
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Explanation
Tuber is oval or spherical underground modified stem lacking adventious roots. It possesses a number of spirally arranged depressions called eyes. Each eye represents node and consists of 1-3 axillary buds in the axils of small scally leaves.
Which of the following animals is not viviparous?
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Explanation
(c) Platypus is oviparous
A scion is grafted to a stock. The quality of fruits produced will be determined by the genotype of
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Explanation
Grafting is the technique of joining parts of two plants so as to form a composite plant. One plant has a strong root system call the stock, and the other plant having better flower or fruit yield is known as scion. When a scion is grafted to a stock the root system of the plant has the genotype of stock and fruits produced show geneotypes of scion.
The ploidy of bread wheat is
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Explanation
Bread wheat (Triticum aestivum) is human made cereal which possesses 6 sets of chromosome, i.e., it is a hexaploid plant.
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