Montreal Protocol was called to check emission of
Questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement-1 :EEG is of immense diagnostic value in the cardiac diseases.
Statement-2 :Defects in cardiac functions can be reflected in changes in the pattern of electrical potentials recorded in the EEG.
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Solution
An electrocardiogram is the recording of the various events of the cardiac cycle. Defects in cardiac functions or structures are reflected in the ECG. The ECG is,therefore of immense diagnostic value in cardiac diseases. On the other hand, EEG is an index of the brain functions. EEG or electroencephalogram represents the spontaneous electrical activity of the brain as recorded from the electrodes placed on the scalp. EEG wave pattern obtained shows certain characterstic feature of the brain like the frequency amplitude of the signals of brain. Thus any deviation from the normal caused eithery brain disease or change in the physiological state of the brain can be easily detected by EEG.
Random unidirectional change in allele frequencies that occurs by chance in all populations and especially in small populations is known as:
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Solution
Genetic drift is random change in allele number and frequency in a gene pool due to chance (e.g., small sizeof population). It is caused by sampling error or error in gene pool sample that is to form the next generation.The sampling gene pool is generally small in size. Variability is also limited.
Which of the following statement(s) is/are correct?
(1) Organisms living in oceans, lakes and rivers do not face any water-related problems
(2) Euryhaline can tolerate a wide range of salinities
(3) Stenohaline are restricted to a narrow range of salinities
(4) No fresh water animals cannot live for long in sea water but sea animals can live in fresh water for long time because of osmotic balance
Which of the following correctly matches a phase of the cell cycle with its description?
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Solution
This phase follows cytokinesis.
Water melon is –
The cell junctions called tight, adhering and gap junctions are found in
Which of the following hormone is concerned chiefly with root initiation?
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Solution
Application of IAA, indole butyric acid, 2, 4-D, etc., to cut end of the stem stimulates root initiation in propagation of cuttings.
Why Calvin cycle is called C3-cycle ?
What is the number and positions of insertions of flagella in class Rhodophyceae?
Question 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 :Algae and fungi are grouped in thallophyta.
Statement 2 :Algae and fungi show no differentiation inthallus
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Solution
On the basis of
(i)Thallus like non-vascular plant body.
(ii)Simple, unicellular non-jacketed sex organs and
(iii)No embryo development after gametic union, thealgae and fungi have long been grouped together inthallophyta. The algae and fungi are the result of parallel development and do not indicate any phylogenetic relationship.
Aqueous humour is present
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Solution
Aqueous humour is the watery fluid in the anterior chamber of the eye between the lens and the cornea.
DIRECTIONS : This question contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason) and has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : No two species can occupy the same ecological niche in a habitat.
Statement 2 : A habitat can contain only on ecological niche.
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Solution
The place where an organism lives is called its habitat.Habitats are characterised by conspicuous physical features, which may include the dominant forms of plant and animal life. Habitat may also refer to the place occupied by an entire biological community. For example, a large number of species are found in a forest habitat. On the other hand, the ecological niche of an organism represents (i) the range of conditions it can tolerate (ii) the resources it utilises, and (iii) its functional role in the ecological system. A habitat can contain many ecological niches and support a variety of species. Each species has a distinct niche, and no two species are believed to occupy exactly the same niche.
Through their effect on plant growth regulators, what do the temperature and light control in the plants?
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Solution
Flowering is induced by light and temperature.
Prophase is longer in
Offsprings of oviparous animals are at greater risk as compared to offsprings of viviparous animals because-
A piece of bone such as femur of frog if kept in dilute HCl for about a week will
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Solution
When a bone is kept in dilute acids like HCl for a few days, the Ca salts get dissolved leaving only the soft and flexible organic matrix. This process is called Decalcification. If a bone is kept in KOH it remains unaffected and only the surrounding muscles and connective tissues get dissolved so that the bone now appears clean.
Urea from the blood can be removed by
Which one of the following statement is not correct?
Inter vertebral discs are composed of