About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH-surge) normally occurs?
1. 11th day
2. 14th day
3. 20th day
4. 5th day
Consider the following statements (A)-(D) each with one or two blanks:
| (A) | Bears go into _____(1)_____ during winter to _____(2)_____ cold weather. |
| (B) | A conical age pyramid with a broad base represents _____(3)_____ human population. |
| (C) | A wasp pollinating a fig flower is an example of _____(4)_____ . |
| (D) | An area with high levels of species richness is known as _____(5)_____ . |
Which of the following options, gives the correct fill-ups for the respective blank numbers from(1) to (5) in the statements?
| 1. | (1) - hibernation, (2) - escape, (3) - expanding, (5) - hot spot |
| 2. | (3) - stable, (4) - commensalism, (5) - marsh |
| 3. | (1) - aestivation, (2) - escape, (3) - stable, (4) - mutualism |
| 4. | (3) - expanding, (4) - commensalism, (5) - biodiversity park |
Consider the following statements (A-D) about organic farming:
| A. | Utilizes genetically modified crops like Bt cotton |
| B. | Uses only naturally produced inputs like compost |
| C. | Does not use pesticides and urea |
| D. | Produces vegetables rich in vitamins and minerals |
Which of the above statements is correct?
1. (A) and (B) only
2. (B), (C) and (D)
3. (C) and (D) only
4. (B) and (C) only
Biodiversity of a geographical region represents:
| 1. | Species endemic to the region |
| 2. | Endangered species found in the region |
| 3. | The diversity in the organisms living in the region |
| 4. | Genetic diversity is present in the dominant species of the region. |
Which one of the following options gives the correct matching of a disease with its causative organism and mode of infection:
|
Disease |
Causative Organisms |
Mode of Infection |
|
|
1. |
Malaria |
Plasmodium vivax |
Bite of male Anopheles mosquito |
|
2. |
Typhoid |
Salmonella typhi |
With inspired air |
|
3. |
Pneumonia |
Streptococcus pneumonia |
Droplet infection |
|
4. |
Elephantiasis |
Wuchereria bancrofti |
With infected water and food |
The pathogen Microsporum responsible for ringworm disease in humans belongs to the same Kingdom of organisms at that of:
1. Ascaris, a roundworm
2. Taenia, a tapeworm
3. Wuchereria, a filarial worm
4. Rhizopus, a mould
Select the correct statement with respect to disease and immunisation:
| 1. | Injection of snake antivenom against snake bite is an example of active immunisation. |
| 2. | If due to some reason, B-and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen. |
| 3. | Injection of dead/inactivated pathogens causes passive immunity. |
| 4. | Certain protozoans have been used to mass produce hepatitis B vaccine. |
Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein:
| 1. | does not kill the carrier bacterium which is itself resistant to this toxin |
| 2. | binds with epithelial cells of the midgut of the insect pest ultimately killing it |
| 3. | is coded by several genes including the gene cry. |
| 4. | is activated by acid pH of the foregut of the insect pest. |
Which one of the following techniques made it possible to genetically engineer living organisms?
1. Hybridization
2. Recombinant DNA techniques
3. X-ray diffraction
4. Heavier isotope labelling
Which one of the following statements is totally wrong about the occurrence of a notochord, while the other three are correct?
| 1. | It is present throughout life in Amphioxus |
| 2. | It is present only in larval tails in Ascidians |
| 3. | It is replaced by the vertebral column in an adult frog |
| 4. | It is absent throughout life in humans from the very beginning |
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