In homeotherms, the brain centre, which regulates body temperature, is situated in
Options
(a) hypothalamus (b) cerebral lobe (c) cerebellum (d) medulla oblongata
Correct Answer:
hypothalamus
Explanation:
The hypothalamus plays important role in controlling […]
Root nodules for nitrogen fixation of a nonleguminous tree possess
Options
(a) Frankia (b) Rhizobium (c) Azotobacter (d) Thiobacillus
Correct Answer:
Frankia
Explanation:
Frankia is a Gram-positive species of actinomycete filamentous bacterium that […]
When ethyl iodide and propyl iodide react with Na in the presence of ether, they form
Options
(a) three alkanes (b) two alkanes (c) one alkanes (d) four alkanes
Correct Answer:
three […]
In the following reaction CHCl₃ + C₆H₅NH₂ + 3NaOH → A + 3B + 3C the product A is
Options
(a) ethylidene chloride (b) phenyl cyanide (c) chlorobenzene (d) phenyl isocyanide
Correct […]
During DNA replication, the term leading strand is applied to the one which replicates in
Options
(a) 5′ → 3′ direction discontinuously (b) 3′ → 5′ direction continuously (c) 5′ → 3′ direction […]
From a cross AABb × aaBb, the genotypes AaBB : AaBb : Aabb : aabb will be obtained in which of the following ratio?
Options
(a) 0 : 3 : 1 : 0 […]
The genes controlling seven traits in pea, as studied by Mendel, were later found to be located on how many number of chromosomes?
Options
(a) five (b) four (c) seven (d) six
Correct […]
The jumping gene in maize were discovered by
Options
(a) H.G. Khorana (b) Barbara Mc Clintock (c) Beadle and Tatum (d) T.H. Morgan
Correct Answer:
Barbara Mc Clintock
Explanation:
No explanation available. Be […]
In high yielding hybrid crop varieties, to exploit hybrid vigour, the farmers need to purchase fresh hybrid seed every year, because
Options
(a) it is cheaper to purchase fresh seed (b) hybrid vigour […]
Somaclonal variations are the variations
Options
(a) caused by mutagenic chemicals (b) produced during sexual embryogeny (c) produced during tissue culture (d) caused by (gamma) rays
Correct Answer:
produced during tissue culture
Explanation: […]
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