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Charles Darwin and his son Francis disco...

Charles Darwin and his son Francis discovered (around 1880) that a grass seedling bends towards light only if the

A

stem is at least 10 cm long

B

tip of the coleoptile is present and exposed to light

C

cotyledon is present and exposed to light

D

nights are long in comparison with the days

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The correct Answer is:
B
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ARIHANT NEET-PLANT GROWTH AND DEVELOPMENT -CHAPTER EXERCISES ( TAKING IT TOGETHER )
  1. Which of the following phytohormone does not occur naturally in plants...

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  2. Who demonstrated that the severed tip of Canary grass would resume ph...

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  3. Charles Darwin and his son Francis discovered (around 1880) that a gra...

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  4. Avena coleptile auxin is

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  5. The curvature causing stimulus is active on the dark side of the coleo...

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  6. In decapitated plants, axillary buds are activated because

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  7. Auxin inhibits the growth of

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  8. Apical dominance in higher plants is due to

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  9. Apical dominance is caused when auxin

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  10. The plant growth regulator involved in xylem differentiation is

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  11. The lateral buds are induced to grow when the concentration of cytokin...

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  12. Which of the following effects of auxins on plants is the basis for co...

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  13. Seedless fruits can be developed by treating the unpollinated ovaries ...

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  14. Fruit drop is caused by

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  15. Which hormone plays an important role in the formation of roots?

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  16. Which of the following is the effect of NAA?

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  17. The synthetic hormone used as a weedicide is

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  18. Negative geotropism in horizontle stems is caused by

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  19. High concentration of auxins would

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  20. In a unilaterally illuminated coleoptile tip, the precentage of auxin ...

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