The rate of a first-order reaction is 0.04 mol l‑1 s-1 at 10 seconds and 0.03 mol l-1 s-1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is:
1. 44.1 s
2. 54.1 s
3. 24.1 s
4. 34.1 s

 

Subtopic:  First Order Reaction Kinetics |
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Which of the following characteristic features always hold true for the corresponding group of animals? 
 

(a) Viviparous (1) Mammalia
(b) Possess a mouth with an upper and a lower jaw (2) Chordata
(c) 3- chambered heart with one incompletely divided ventricle (3) Reptilia
(d) Cartilaginous - Endoskeleton (4) Chondrichthyes

1. a

2. b

3. c

4. d

Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
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Changes in GnRH pulse frequency in females is controlled by circulating levels of
1. estrogen and inhibin
2. progesterone only
3. progesterone and inhibin
4. estrogen and progesterone
Subtopic:  Introduction to Menstrual Cycle: 2 | Introduction to Menstrual Cycle |
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Microtubules are the constituents of
1. spindle fibres, centrioles and cilia
2. centrioles, spindle fibres and chromatin
3. centrosome, nucleosome and centrioles
4. cilia, flagella and peroxisomes

 

Subtopic:  Cilia & Flagella |
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Mitochondria and chloroplast are 
I. semi-autonomous organelles. 
II. formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery. 
Which one of the following options is correct?
1. II is true but I is false
2. I is true but II is false
3. Both I and II are false
4. Both I and II are correct
Subtopic:  Plastids | Mitochondria |
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Photosensitive compound in human eye is made up of
1. Opsin and Retinal
2. Opsin and Retinol
3. Transducin and Retinene
4. Guanosine and Retinol

Subtopic:  Human Eye: Adaptation |
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Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom
1. Protista
2. Fungi
3. Animalia
4. Monera

 

Subtopic:  Kingdom Protista: Introduction |
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The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animal, include the
1. thermoacidophiles
2. methanogens
3. eubacteria
4. halophiles
Subtopic:  Kingdom Monera: Bacterial Classification |
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Identify the correct statement on 'inhibin'
1. Is produced by granulosa cells in ovary and inhibits the secretion of FSH
2. Is produced by granulosa cells in ovary and inhibits the secretion of LH
3. Is produced by nurse cells in testes and inhibits the secretion of LH
4. In hibits the secretion of LH, FSH and prolactin.
Subtopic:  Seminiferous Tubules & Spermatogenesis | Spermiogenesis/Sperm Structure/Hormonal Regulation |
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It is much easier for a small animal to run Uphill than for a large animal, because
1. smaller animals have a higher metabolic rate
2. small animals have a lower O2 requirement
3. the efficiency of muscles in large animals is less than in the small animals
4. it is easier to carry a small body weight

 

Subtopic:  Response of Organisms to Abiotic Factors | Adaptations |
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