Class 11-Biology-chapter 13-Plant Growth and Development InstructionTotal Questions : 20Total time :20 minTotal Marks : 20 x 3 = 60 MarksEach Correct Question carries : 3 MarksEach incorrect Question Carries : -1 MarksEach Unattempted Question carry : 0 MarksBe careful On Negative Markings 1. Shedding of leaves, flowers and fruits due to change in hormone balance in plants is Senescence Abscission Photoperiodism Vernalisation None 2. Which statements are correct?𝑎- Cytokinins suppress the synthesis of chlorophyll𝑏- Auxins control apical dominance𝑐- Gibberellins promote shoot elongation𝑑- Abscisic acid enables seeds to with-stand desication. 𝑏 , 𝑐 and 𝑑 only 𝑎 and 𝑐only 𝑎 and 𝑏 only 𝑏 and 𝑐 only None 3. One hormone hastens the maturity period in juvenile conifers, a second hormone controls xylem differentiation while the third increases the tolerance of plants to various stresses. They are respectively Auxin, gibberellin and cytokinin Gibberellin, auxin, ethylene Gibberellin, auxin, cytokinin Gibberellin, auxin, ABA None 4. Period between formative phase and maturation phase of plant growth is Grand period of growth Stationary phase Lag phase Phase of elongation None 5. During seed germination, its stored food is mobilised by ABA Ethylene Gibberellin Cytokinin None 6. Plant hormones used for inducing morphogenesis in plant tissue culture is Gibberellins Ethylene ABA Cytokinins None 7. The cells derived from meristems differentiate and regain the capacity to divide by a phenomenon called Differentiation Redifferentiation Dedifferentiation Totipotency None 8. Cytokinin is not found in Shoot apex Young fruits Mature fruits Root apex None 9. Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings is brought about by Gibberellins Ethylene Kinetin Auxins None 10. Abscisic acid is called stress hormone as it Induces flowering Breaks seed dormancy Promotes leaf fall Promotes stomatal closure None 11. Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of a freshly cut coleoptile stumps. Of what significance is this experiment. It supports the hypothesis that IAA is auxin It made possible the isolation and exact identification of auxin It is basis of quantitative determination of small amounts of growth promoting substances It demonstrated polar movement of auxins None 12. Which of the following is the effect of a plant hormone, which is synthesised more in absence of light? Length of intenodes increases Induces the dormancy of seeds Responsible for closing of stomata Inhibits the development of seedless fruits None 13. Growth hormone that speeds up malting in brewery industry is Auxin Ethylene Kinetin Gibberellic acid None 14. Two different plants associated with discovery of two different phytohormones having common biosynthetic precursor exhibit one of the following characters eachI. Versatile anthers II. Compound spadix III. Pentalocular ovary IV. Trifoliate compound leaves I and IV II and IV II and III I and III None 15. Transport of cytokinin in the plant body is Acropetal Lateral Basipetal On all sides None 16. Which of the following plant function is not controlled by auxins? Apical dominance Photoperiodism Growth Photosynthesis None 17. Which is not the effect of ethylene? Breaks seed and bud dormancy Brings about horizontal growth of seedlings Promotes senescence and abscission of plant organs Helps to overcome apical dominance None 18. Cholodony and Went effect is due to Cytokinin GA IAA ABA None 19. Cytokinins which have specific effect in cytokinesis are modified forms of Cytosine Adenine Guanine Thiamine None 20. Which is not a function of cytokinin? Promoting bud dormancy Promoting stomatal opening Delay is senescence Breaking seed dormancy None Time's upTime is Up! Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
