Following are important model questions for NEET – 2018 examination. The questions cover Botany subject syllabus prescribed for NEET examination. The answers / key is given at the end of the questions. The model questions are given from the entire syllabus of Botany / Biology.
1. Nissl’s granules are found in
1) Dendrites and axon
2) Cyton and axon
3) Cyton and dendrites
4) Dendrites and telodendrites
2. The most spectacular and evolutionarily fascinating examples of mutualism are found in
1) Plant-plant relationships
2) Animal-bacteria relationships
3) Invertebrate-vertebrate relationships
4) Plant-animal relationships
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3. Peristaltic movements of the gut are increased by the stimulation of
1) Nodal system
2) Sympathetic neural system
3) Somatic neural system
4) Parasympathetic neural system
4. The most abundant organic compound on earth is ….. and the most abundant protein is ……
1) Starch & RuBisco
2) Cellulose & RuBP
3) RuBisco & Starch
4) Cellulose & RuBisco
5. Haploid daughter cells formed as a result of meiosis in plants and in animals, respectively
1) Spores and Spores
2) Gametes and Gametes
3) Spore mother cells and Gametes
4) Spores and Gametes
7. A fall in GFR activates JG cells to release
1) ANF 2) Angiotensin 3) ADH 4) Renin
8. The resting axonal membrane is comparatively more permeable to
1) Na+ 2) K+ 3) Ca2+ 4) Proteins
9. Inferior position of ovary is observed in the flowers of
1) Plum 2) Sunflower 3) Chinarose 4) Brinjal
10. The kangaroo rat is able to survive in the desert without drinking water. Which of the following statement(s) is/are most appropriate explanation for this feature?
a) Its nephrons have long loops of Henle.
b) It conserves energy by excreting ammonia.
c) Air exhaled from its lungs becomes warm as it passes through the short nasal cavities.
d) It gains water mainly from oxidation of fat.
1) (a) and (d) 2) (a), (c) and (d)
3) Only (d) 4) (a), (b) and (d)
11. Which of the following is ‘fast block’ to polyspermy?
1) Cortical reaction
2) Acrosomal reaction
3) Zona reaction
4) Depolarisation of the cell membrane of the oocyte
14. Mortality for newborns is greater for those either under-weight or over-weight. This represents
1) Disruptive selection as the bell-shaped curve obtains two peaks
2) Stabilising selection as it reduces the variance in birth weight
3) Disruptive selection as more individuals acquire peripheral character value at both ends of the distribution curve
4) Directional selection as it pushes the mean of the character in one direction
15. Deficiency of sulphur cause all except
1) Inhibition of cell division
2) Necrosis
3) Delay in flowering
4) Chlorosis
16. Fovea centralis is the area of highest visual acuity or resolution. Select the best option in support of this from the following statements:
a) Only cones are densely packed in it.
b) It contains more photoreceptor cells than bipolar cells than ganglion cells.
c) Bipolar and ganglion cells are displaced to the periphery and do not cover the cones.
d) Optic nerve exits the eye at fovea centralis.
1) (a) and (c) 2) (a), (b) and (c)
3) Only (c) 4) (a) and (d)
18. The circulation of blood to and from the cardiac musculature is called
1) Carotid circulation
2) Pulmonary circulation
3) Portal circulation
4) Coronary circulation
19. Mark the incorrect match.
1) Intrafascicular cambium – Primary lateral meristem
2) Phelloderm – Secondary parenchyma
3) Medullary rays – Primary parenchyma
4) Intercalary meristem – Secondary lateral meristems
20. Turner’s syndrome and Down’s syndrome are genetic disorders. Select the correct statement from the following options:
1) In both cases, the affected person has 47 chromosomes instead of 46.
2) Both occur due to failure of cytokinesis after telophase of cell division
3) Neither of them are typically passed from one generation to the next
4) There is an extra Barr body in Turner’s syndrome but not in Down’s syndrome
21. The genotypes of a husband and wife are I Ai and I Bi. With respect to ABO blood types, how many different genotypes and phenotypes are possible among their children?
1) 3 genotypes; 4 phenotypes
2) 4 genotypes; 3 phenotypes
3) 4 genotypes; 4 phenotypes
4) 3 genotypes; 3 phenotypes
22. Amides (double aminated keto acids) are mostly transported to other parts through
1) Sieve tube 2) Phloem fibres
3) Xylem vessels 4) Xylem parenchyma
23. Storage organ is stem in all except
1) Amorphophallus 2) Onion
3) Turmeric 4) Potato
24. Which one of the following is a method of in situ conservation of biodiversity?
1) Sacred groves 2) Botanical gardens
3) Cryopreservation 4) Tissue culture
25. The incorrect matching among the following is
1) Selaginella – Seed habit
2) Calotropis – Valvate aestivation
3) Alstonia – Circular/ whorled phyllotaxy
4) Rose – Apocarpy
26. Which of the following is an autosomal recessive disorder?
1) Phenylketonuria
2) Myotonic dystrophy
3) Haemophilia A
4) Red-green colourblindness
28. Crossing over occurs in between
1) Homologous & sister chromatids
2) Non homologous & nonsister chromatids
3) Homologous & non sister chromatids
4) Non homologous & sister chromatids
29. Synthesis of multiple copies of gene of interest using PCR is initiated by
1) Two sets of RNA primers
2) Two sets of DNA primers
3) DNA polymerase
4) One set of RNA primer
30. A hormone produced in a woman only during pregnancy is
1) hGH 2) Oxytocin 3) hCG 4) Progesterone
31. In a woody tree primary tissues are located at this region
1) Bast 2) Wood
3) Periderm 4) Root and stem apices
32. Which one of the following is not observe in grasses?
1) Scutellum 2) Coleoptile
3) Caryopsis Fruit 4) Lenticels
34. Oral contraceptive pills
1) Inhibit gametogenesis
2) Make cervical mucus clear and watery
3) Inhibit ovulation
4) Stimulate secretion of LH
35. Pick the incorrect pair
1) Activated sludge – Flocs
2) Primary sludge – Inorganic matter
3) BOD – Measure of impurity
4) Biogas – Mostly CO2 and traces of H2S, S, CH4
36. Which one of the following characteristics is shared by Crocodylus and Corvus?
1) Four chambered heart
2) Homoiothermous nature
3) External fertilization
4) Dicondylic skull
38. The genotype of a plant showing the dominant phenotype can be determined by
1) Monohybrid cross 2) Pedigree analysis
3) Test cross 4) Dihybrid cross
39. Why is vivipary undesirable for annual crop plants?
1) It reduces vigour of plants
2) Seeds exhibit long dormancy
3) Seeds cannot be stored for next season
4) It effects fertility of plants
40. The joint between carpal and metacarpal of thumb is
1) Saddle joint 2) Pivot joint
3) Hinge joint 4) Fibrous joint
Answers / Key:
1-3
2-4
3-4
4-4
5-4
7-4
8-2
9-2
10-1
11-4
14-2
15-2
16-1
17-3
18-4
19-4
20-3
21-3
22-3
23-2
24-1
25-1
26-1
27-3
28-3
29-2
30-3
31-4
32-4
34-3
35-4
36-1
38-3
39-3
40-1