AIPMT Biology Online Test

1. About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:
calcium and phosphorous
phosphorus and sulphur
sulphur and magnesium
magnesium and sodium
2. Which one of the following is an example of negative feed back loop in humans?
Secretion of sweat glands and constriction of skin blood vessels when it is too hot.
Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold.
Secretion of tears after falling of sand particles in to the eye
Salivation of mouth at the sight of delicious food.
3. What is common to whale, seal and shark?
Homoiothermy
Seasonal migration
Thick subcutaneous fat
Convergent evolution

4. Which one of the following is not a constituent of cell membrane?
Phospholipids
Cholesterol
Glycolipids
Proline
5. Select the wrong statement from the following:
The chloroplasts are generally much larger than mitochondria.
Both chloroplasts and mitochondria contain and inner and an outer membrane
Both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane
Both chloroplasts and mitochondria contain DNA.
6. The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of:
Nucleic acids
ATP is small stepwise units
ATP in one large oxidation reaction
Sugars
7. If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:
a skewed curve
a normal distribution
a bi-modal distribution
a T -shaped curve
8. Which one of the following is a slime mould?
Anabaena
Rhizopus
Physarum
Thiobacillus
9. For a critical study of secondary growth in plants, which one of the following pairs is suitable?
Wheat and maiden hair fern
Sugarcane and sunflower
Teak and pine
Deodar and fern
10. Which one of the following statements about Mycoplasma is wrong?
They cause disease in plants
They are also called PPLO
They are pleomorphic
They are sensitive to penicillin
11. In the prothallus of vascular cryptogam, the antherozoids and eggs mature at different times. As a result:
self fertilization is prevented
there is no change in success rate of fertilization
there is high degree of sterility
one can conclude that the plant is apomictic
12. Ergot of rye is caused by a species of:
Phytophthora
Claviceps
Uncinula
Ustilago
13. Which one of the following statement is correct?
Stem cells are specialized cells
Ontogeny repeats phylogeny
All plant and animal cells are totipotent.
There is no evidence of the existence of gills during embryogenesis of mammals
14. What is true about Nereis, Scorpion, Cockroach and Silver fish?
They all belong to the same phylum
They all have jointed paired appendages
They all possess dorsal heart
None of them is aquatic
15. What is common between parrot, platypus and kangaroo?
Ovoparity
Homoiothermy
Functional post -anal tail
Toothless jaws
16. Select the correct statement from the following:
Mutations are random and directional
Darwinian variations are small and directionless
Fitness is the end result of the ability to adapt and gets selected by nature
All mammals except whales and camels have seven cervical vertebrate.
17. ICBN stands for:
Indian Code of Botanical Nomenclature
Indian Congress of Biological Names
International Code of Botanical Nomenclature
International Congress of Biological Names
18. Among the human ancestors the brain size was more than 1000 CC in:
Homo habilis
Homo neanderthalensis
Ramapithecus
Homo erectus
19. Which pair of the following belongs to Basidiomycetes?
Morchella and Mushrooms
Bird’s nest fungi and Pufballs
Pufballs and Claviceps
Peziza and Stink horns
20. Spore dissemination in some liverworts is aided by:
peristome teeth
indusium
calyptra
elaters
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Correct answers:

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