Biology mcqs | Biology solved mcqs | Nts past mcqs

 

Which of the following groups of animals has a cellular or unicellular body 

A. porifera

B. protozoa 

C. eumetazoa 

D. cnidaria 

2. Which contribute to the success of Mendel 

A. qualitative analysis of data 

B. observation of distinct inherited traits 

C. *his knowledge of biology 

D. consideration of one character at one time 

3. Genetic identity of a human male is determined by 

A. autosomes 

B. nucleolus 

C. cell organelles 

D. sex chromosomes 

4. Upper part of sea or aquatic ecosystem contains 

A. plankton 

B. nekton 

C. benthos 

D. plankton and nekton 

5. The structure that is used for feeding in most molluscs is the 

A. buccal cavity 

B. radula 

C. mouth 

D. odontophore 

6. Which one of the following pairs is not correctly matched 

A. cursorial adaptations - Limb bones elongated 

B. fossorial adaptations - Develops shoulder girdle 

C. arboreal adaptations - Webbed feet

D. volant adaptations - Fusion of certain bones

7. Lamarck's theory of organic evolution was published in the book entitled 

A. Systima Naturee 

B. Philosophic Zoologique 

C. Origin of species 

D. none of these 

8. Metabolic rate in mammals is controlled by 

A. pancreas 

B. thyroid

C. pituitary 

D. liver 

9. The ambulacral groove is found between the 

A. rows of tube feet 

B. radial nerves 

C. layers of pedicellariae 

D. rows of dermal ossicles 

10. The agnathans and gnathostomes branched apart most likely during the 

A. cambrian period 

B. silurian period 

C. devonian period 

D. jurassic period 

11. Many echinoderms have two parts to the stomach, these two parts are the 

A. enzymatic, cecal 

B. cecal, cardiac 

C. cardiac, pyloric 

D. pyloric, enzymatic 

12. Which of the following fish may be characterized as eel-like, parasitic, and possessing a 

cartilaginous skeleton 

A. chimera 

B. hag fish 

C. lamprey 

D. ostracoderm13. Which of the following evolved from a group of carnivorous pelycosaurs 

A. therapsids 

B. labyrinthodonts 

C. anurans 

D. theropods 

14. The freshwater fish that survived the Devonian period possessed 

A. efficient gills 

B. lungs 

C. countercurrent flow 

D. paedomorphosis 

15. Which of the following groups of animals has no parasites 

A. platyhelminthes 

B. nematoda 

C. porifera 

D. echinodermata 

16. tt mates with Tt. What will be characteristic of offspring 

A. 75% recessive 

B. 50% recessive 

C. 25% recessive 

D. all dominant 

17. Fertilizin is a chemical substance produced from 

A. mature eggs 

B. acrosome 

C. polar bodies 

D. middle piece of sperm 

18. Association of animals when both partners are benefited 

A. colony 

B. commensalismD. mutualism 

19. The trochophore larva indicates a common ancestry for which of the following pairs 

A. Mollusca-Annelida 

B. Mollusca-Cnidaria 

C. Mollusca-Cephalopoda 

D. Mollusca-Nematoda 

20. The desert animals confine their activities during night time, because they 

A. can see well during the night 

B. get sufficient food during night 

C. have a problem of conservation of water during the day time

D. face less competition for food during night 

21. The characters of no shell, integumental scales, a reduced head and being dioecious 

describes which of the following molluscs 

A. caudofoveata 

B. solenogastres 

C. monoplacophora 

D. polyplacophora 

22. What is the correct sequence of zonation in the lentic environment (i) Profundal zone (ii) 

Sub-littoral zone (iii) Littoral zone 

A. i, ii, iii 

B. i, iii, ii 

C. ii, iii, i 

D. iii, ii, i 

23. Which of the following facts make Lamarckism doubtful 

A. neck of giraffe elongated for grazing from high trees 

B. trees of high altitudes have sloppy branches to avoid deposition of snow 

C. deer is fast runner for protection from predators 

D. indian ladies hav25. The echinoderms have developed the ability to exploit many sources of food. The sea 

stars are _____________, the sea urchins are ________________, and the sea cucumbers 

are ______________. 

A. planktivores, herbivores, worms 

B. carnivores, herbivores, deposit feeders 

C. herbivores, detritivores, algae 

D. detritivores, carnivores, plankton 

26. The respiratory apparatus of agnathans may be characterized by 

A. lack of gill filaments 

B. lack of an operculum

C. the presence of a spiracle 

D. acting as a filter feeding mechanism 

27. The early therians most resembled a small ____ 

A. pig 

B. kangaroo 

C. rat 

D. horse 

28. The first well-known fossil of a tetrapod was ____ 

A. in the genus Sphenodon 

B. in the genus Latimeria 

C. in the genus Ichthyostega 

D. in the genus Desmognathus 

29. In a genetic cross having recessive epistasis, F2 phenotypic ratio would be 

A. 9:6:1 

B. 15 : 1 

C. 9 : 3 : 4 

D. 12 : 30. Cross between AaBB and aaBB will form 

A. 1 AaBB : laaBB 

B. All AaBB 

C. 3AaBB : laaBB 

D. 1 AaBB : 3aaBB 

31. RR (Red) Antirrhinum is crossed with white (WW) one. Offspring RW are pink. This is 

an example of 

A. dominant-recessive 

B. incomplete dominance 

C. hybrid 

D. supplementary genes 

32. In humans, the placenta is 

A. haemochorial 

B. endothelial 

C. epitheliochorial 

D. syndesmochorial 

33. Gastropoda taxonomy is currently under consideration. The traditional three subclasses 

are Prosobranchia, and two others 

A. Nudibranchia, Pelycopoda 

B. Pelycopoda, Opisthobranchia 

C. Opisthobranchia, Pulmonata

D. Pulmonata, Nudibranchia 

34. The monoplacophorans were known only from the fossil record until 1952 when 

________ emerged from a deep-sea trawl net 

A. specimens of Loligo 

B. specimens of Mopalia 

C. specimens of Pedicularia 

D. specimens of Neopilina 

35. Which one of the following statements is not true about energy flow 

A. energy flow is greatly reduced at each successive trophic level from producers to 

herbivores and then to carnivores 

B. the energy captured by the autotrophs does not revert back to solar inpu