set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 5 EXERCISES
The following question based on genetics, evolution of life & ecological biodiversity topic of general science mcq
- Polytene chromosomes found in salivary gland of larva of Drosophila and Chironomus larva.
- They were Discovered by Balbiani.
- They were characterized by presence of puffs and Balbiani rings
- These chromosomes are attached by chromocentre.
(a) 2 only
(b) 2 and 3
(c) 1 and 2
(d) 1, 2, 3 and 4
The correct answers to the above question in:
Answer: (d)
Polytene chromosomes are over-sized chromosomes which have developed from standard chromosomes and are commonly found in the salivary glands of Drosophila melanogaster. These were originally observed in the larval salivary glands of Chironomus midges by Balbiani in 1881. Many balbiani rings and puffs are a part of these chromosomes.
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Read more genetics evolution of life and ecological biodiversity Based General Science Questions and Answers
Question : 1
The famous botanical garden ‘Kew’ is located in
a) Berlin
b) England
c) Lucknow
d) Australia
Answer »Answer: (b)
Question : 3
Consider the following statements :
- Sickle cell anaemia is a genetic disease common in tropical and sub-tropical countries.
- Sickle-cell anaemia is due to mutation in β-globulin gene.
- Due to the sickle-shaped RBCS oxygen carrying capacity of the haemoglobin decreases.
a) 2 and 3
b) 1, 2 and 3
c) 1 only
d) 3 only
Answer »Answer: (b)
Due to mutation in the b-globulin gene of haemoglobin, the oxygen carrying capacity of RBCs decreases considerably, eventually causing sickle cell andaemia.
Question : 4
Insects have
a) 4 pairs of legs
b) 2 pairs of legs
c) 3 pairs of legs
d) 1 pair of legs
Answer »Answer: (c)
Class insecta has 3 pairs of legs located on the thoracic segments. It is the characteristic feature of class Insecta.
Question : 5
The mutation theory of evolution was enunciated by
a) Lamarck
b) Huxley
c) Darwin
d) Hugo de Vries
Answer »Answer: (d)
Question : 6
Consider the following statements :
- Mirabilis is an exception to Mendel’s principle of dominance.
- Mendel’s second law is the law of segregation.
- Mendel’s law of independent assortment is based on F2 ratio of 9 : 3 : 3 1.
a) 1 and 3
b) 2 only
c) 1 only
d) 1, 2 and 3
Answer »Answer: (d)
Incomplete dominance and Co-dominance are non-Mendelian genetic characteristics. Mendel’s second law is the law of independent assortment of segregation. It is based on the F2 ratio of 9 : 3 : 3 : 1
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