CBSE Class 11 (Science) Plant Growth and Development — practice questions
92 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) Plant Growth and Development in the app →Apical meristems are responsible forThe typical growth curve of a plant or organ isWhich is the most reliable measure of plant growth?Differentiation in plants refers toDedifferentiation is best illustrated byHeterophylly in coriander or aquatic buttercup demonstratesAuxin is produced primarily atGibberellins are best known for inducingIn tissue culture, a HIGH auxin to LOW cytokinin ratio in the medium favoursEthylene is unique among plant hormones because it isWheat is a long-day plant, which means it flowers whenVernalisation refers toA leaf unfolds and expands. Is this growth?Plants can keep growing all their lives because they have:A tree trunk gets thicker every year. This increase in girth is:At the cell level, growth is mainly an increase in the amount of:One maize root tip can make more than ___ new cells per hour.The three phases of growth are meristematic, elongation and:A cell forming a tracheary element loses its protoplasm. This maturing for a job is:Mature parenchyma cells start dividing again to form cork cambium. This is:Auxins, gibberellins and cytokinins are grouped as plant growth:Darwin and his son saw canary grass coleoptiles bend towards light. This response is:Kurosawa found rice seedlings grew foolishly tall after fungal filtrate. The substance was:Ripe oranges gave off a gas that ripened stored bananas. The gas was:A gardener dips stem cuttings in a powder to make roots grow. The powder holds:The growing apical bud stops side buds from growing. This is:Tea gardeners pinch off shoot tips so that:2,4-D kills dicot weeds in a lawn but spares the grass because it does not affect mature:Grape growers spray a PGR to lengthen the bunch stalks. It is a:Fruits ripen faster in a closed box thanks to a gas they release. The gas is:In a drought a hormone closes the stomata and is called the stress hormone. It is:ABA mostly acts as an antagonist of:Plants that flower only when light lasts longer than a critical time are:Which part of the plant senses day length?Which definition best describes growth in a living organism?Plants can keep growing throughout life because of the presence of what?Growth in which new cells are always added by meristem activity is called which form?Which meristems cause an increase in the girth of woody plant organs?Growth at the cellular level is mainly a consequence of increase in what?How is the growth of a pollen tube usually measured?The growth of a dorsiventral leaf is best expressed as an increase in what?A maize root apical meristem can give rise to how many new cells per hour?In watermelon, growth is expressed mainly as an increase in what?Which set lists the three phases of growth in a root tip?Cells of the meristematic phase have which kind of cell walls?Increased vacuolation and cell enlargement characterise which phase of growth?In which zone do cells reach maximal size with wall thickening and protoplasmic changes?Increased growth per unit time is termed as what?A root elongating at a constant rate shows which kind of growth?Plotting organ length against time for arithmetic growth gives what kind of curve?In geometric growth, which phase comes first when growth is still slow?Why does geometric growth slow down into a stationary phase?Geometric growth plotted against time gives which curve?In the equation W1 = W0 e^rt, what does r stand for?Measuring total growth per unit time gives which quantity?Growth per unit time expressed per unit initial parameter is called what?Why is water essential for cell growth in plants?The act leading to maturation of meristem-derived cells is termed what?Living differentiated cells regaining the capacity to divide show what?Interfascicular cambium forms from which fully differentiated cells?Cells produced by dedifferentiated meristems that mature again are called what?Development includes all changes from seed germination up to which stage?The ability of plants to form different structures in response to environment is called what?Buttercup leaves differ in shape in air and in water. This is an example of what?Development in plants is considered the sum of which two processes?Which factor is an intrinsic intercellular control of plant development?Indole-3-acetic acid belongs to which chemical class of PGRs?Kinetin is a derivative of which compound?Which PGR is a gas?Which PGR is mainly involved in dormancy and abscission rather than promoting growth?Darwin's coleoptile experiments with canary grass concerned which response?Auxin was isolated from coleoptile tips of oat seedlings by whom?Bakanae disease in rice led to the discovery of which PGR?Inhibitor-B, abscission II and dormin were later proved to be which substance?H.H. Cousins observed that ripe oranges hastened ripening of which stored fruit?Auxins are generally produced by which plant regions?Which PGR is applied to initiate rooting in stem cuttings?The growing apical bud inhibiting lateral buds is called what?Why are tea plantations and hedges trimmed at the shoot tip?Which synthetic auxin kills dicot weeds but not mature monocots?Auxins induce seedless fruit formation, called what, as in tomatoes?Sprayed on sugarcane, which PGR increases stem length and yield?Which PGR speeds up the malting process in the brewing industry?Spraying juvenile conifers with GAs has what effect?Kinetin was discovered from which source?Which PGR helps delay leaf senescence by promoting nutrient mobilisation?Which PGR is made in large amounts by ripening fruits and senescing tissues?Which compound is most widely used as a source of ethylene?Which PGR keeps deep water rice leaves above water by rapid internode growth?Why is abscisic acid called the stress hormone?Which PGR stimulates closure of stomata?In most situations ABA acts as an antagonist to which PGR?