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. Period between formative phase and maturation phase of plant growth is Stationary phase Phase of elongation Lag phase Grand period of growth None 2. Cytokinins which have specific effect in cytokinesis are modified forms of Cytosine Thiamine Adenine Guanine None 3. Plant hormones used for inducing morphogenesis in plant tissue culture is Cytokinins Gibberellins Ethylene ABA None 4. Abscisic acid is called stress hormone as it Breaks seed dormancy Promotes stomatal closure Promotes leaf fall Induces flowering None 5. Which is not a function of cytokinin? Promoting stomatal opening Promoting bud dormancy Delay is senescence Breaking seed dormancy None 6. 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 II and III I and III II and IV I and IV None 7. Shedding of leaves, flowers and fruits due to change in hormone balance in plants is Vernalisation Senescence Photoperiodism Abscission None 8. Growth hormone that speeds up malting in brewery industry is Auxin Gibberellic acid Kinetin Ethylene None 9. During seed germination, its stored food is mobilised by Gibberellin ABA Cytokinin Ethylene None 10. Which of the following plant function is not controlled by auxins? Photosynthesis Photoperiodism Growth Apical dominance None 11. Which of the following is the effect of a plant hormone, which is synthesised more in absence of light? Responsible for closing of stomata Length of intenodes increases Induces the dormancy of seeds Inhibits the development of seedless fruits None 12. 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. 𝑎 and 𝑏 only 𝑎 and 𝑐only 𝑏 , 𝑐 and 𝑑 only 𝑏 and 𝑐 only None 13. Cholodony and Went effect is due to ABA Cytokinin IAA GA None 14. The cells derived from meristems differentiate and regain the capacity to divide by a phenomenon called Dedifferentiation Redifferentiation Totipotency Differentiation None 15. Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings is brought about by Auxins Ethylene Kinetin Gibberellins None 16. 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 Gibberellin, auxin, ethylene Auxin, gibberellin and cytokinin Gibberellin, auxin, cytokinin Gibberellin, auxin, ABA None 17. Transport of cytokinin in the plant body is Basipetal On all sides Lateral Acropetal None 18. 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 demonstrated polar movement of auxins It made possible the isolation and exact identification of auxin It supports the hypothesis that IAA is auxin It is basis of quantitative determination of small amounts of growth promoting substances None 19. Cytokinin is not found in Root apex Shoot apex Young fruits Mature fruits None 20. Which is not the effect of ethylene? Breaks seed and bud dormancy Promotes senescence and abscission of plant organs Helps to overcome apical dominance Brings about horizontal growth of seedlings 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.
