10 MCQ on Plant Science for various Agriculture Exams ✅

1. Chromosomes were first described by
   a) Waldeyer
   b) Schleiden
   c) Sutton
   d) Boveri

2. Hardy-Weinberg law cannot be applied in
   a) Brassica sps.
   b) Carrot
   c) Maize
   d) Groundnut

3. Root knot nematode is
   a) Xiphinema
   b) Radopholus
   c) Meloidogyne
   d) Heterodera

4. Ground nut bud necrosis disease is transmitted by
   a) Aphids
   b) Thrips
   c) White flies
   d) Mealy bugs

5. Pierce’s disease of grapes caused by
   a) Xylellafastidiosa
   b) Xanthomonasvitis
   c) Clavibacteryxilii
   d) Plasmodiophora brassicae

6. Downy mildew of sunflower is caused by
   a) Sclerospora graminicola
   b) Peronospora parasitica
   c) Plasmopara halstedii
   d) Bremia lactucae

7. Bacterial soft rot of vegetables is caused by
   a) Bacillus
   b) Erwinia
   c) Pseudomonas
   d) Staphylococcus

8. Papillate sporangium is the character of
   a) Pythium
   b) Rhizopus
   c) Mucor
   d) Phytophthora

9. The coding sequences are called
   a) Introns
   b) Exons
   c) Mutons
   d) Recon

10. The condition where the pollen grains from flower of one plant fall on the receptive stigma of other flower of the same plant
    a) Geitonogamy
    b) Crossing
    c) Hybridization
    d) Allogamy

11. An example of selective toxin is
    a) Ten toxin
    b) Cercosporin
    c) Victorin
    d) Fusaric acid

12. In CGMS system, crossing of A x B lines is referred to as
    a) Breeder seed stage
    b) Foundation seed stage
    c) Certified seed stage
    d) Certified seed stage-II

13. A mutation which substitutes one amino acid for another is
    a) Mis sense mutation
    b) Silent mutation
    c) Non sense mutation
    d) Sense mutation

14. According to Chargaff’s rule in DNA
    a) A+T = C+G
    b) A+G = C+T
    c) A+G = 0
    d) A+G / C+T = 0

15. The classical Mendelian traits are _______ in nature
    a) Quantitative
    b) Qualitative
    c) Complex
    d) Polygenic

16. An example of virus containing ds DNA
    a) Gemini virus
    b) Caulimovirus
    c) Tobravirus
    d) Tobamovirus