Certain organism are allowed to respire anaerobically for sometime. If they are transferred to an oxygen containing medium,the rate of aerobic respiration of these organisms is always faster as compared to the rate of respiration of organisms which are given O2 since the beginning. This might be due to one of the following reasons.
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Solution
Anaerobic respiration produces pyruvic acid which is the raw material for aerobic oxidation. So if the organism was already producing pyruvic acid it will hasten the rate of Krebs cycle.
Respiratory centre of brain is sensitive to
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Solution
A chemo sensitive area located close to the respiratory centre in medulla is highly sensitive to changes in pCO2or pH of the blood.
Which one of the sponge part corresponds to the mouth of other animals ?
The following graph of relative concentrations of the four hormones present in the blood plasma of a woman during her menstrual cycle. Identify the hormones.
Point mutation involves:
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Solution
A point mutation is a simple change in one base of the gene sequence. This is equivalent to changing one letter in a sentence, such as this example, where we change the ‘c’ in cat to an ‘h’:
Original: The fat cat ate the wee rat.
Point Mutation: The fat hat ate the wee rat.
When a flower can be divided into two equal radial halves in any radial plane passing through the centre, it is known as
Antiparallel strands of a DNA molecule means that
Read the following four statements (A to D) and mark the option that has both correct statements
- Blood conc. of glucose in a normal healthy man is 4.5 to 5.0 mM
- In proteins only left handed helices are observed
- The pitch of B- DNA is 3.4 Angstrom
- At each step of ascent the strand of DNA turns 36 degree
Which of the following is correct about the slime mould ?
(1)Its thalloid body, Plasmodium has pseudopodia for locomotion and engulfing organic matter.
(2)During unfavourable conditions Plasmodium differentiates and produces fruiting bodies, sporangium.
(3)Spores posses no true cell wall.
(4)They are dispersed by air current.
(5)Being extremely resistant, spores survive for many years.
(6)Plasmodium can grow upto several feet.
Choose the answer from the following options
Proteins consist of
When a meristematic tissue cambium is present inside a vascular bundle, the bundle is said to be
The relationship between hermit crab and sea anemone is
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Solution
Commensalism is a relationship between organism and its host in which the host neither benefits nor suffers from the association, e.g., hermit crab and sea anemone.
Termination of polypeptide chain is brought about by
Phylogenetic classification systems based on—
RuBisCO stands for
Questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 :Blood is colourless in the insects.
Statement 2 : Insect blood has no role in O2transport.
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Solution
Insect blood is colourless and does not play any role in transport of oxygen. Insects have tracheal respiration.
The sphincter of oddi is present between
What is the probability that a cross between a true-breeding pea plant with smooth seeds and a true-breeding pea plant with wrinkled seeds will produce F1 progeny with smooth seeds ?
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Solution
This is an example of a mono hybrid cross. All of the F1 progeny would have smooth seeds. (The F1 generation would all have the genotype Ss, producing the phenotype of smooth seeds because the smooth allele, S, is dominant to the wrinkled allele, s).
When synapsis is complete all along the chromosome, the cell is said to have entered a stage called –
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Solution
When synapsis is complete all along the chromosome,the cell is said to have entered a stage called Pachytene.
Trichoderma harzianum has proved a useful micro organism for