CBSE Class 12 (Science) Sexual Reproduction in Flowering Plants — practice questions
104 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) Sexual Reproduction in Flowering Plants in the app →The female reproductive whorl of a flower is theA typical angiosperm embryo sac hasThe tough outer wall (exine) of pollen grains is made ofDouble fertilisation in angiosperms producesPollination of grasses occurs mainly throughSelf-incompatibility is a mechanism that preventsMicrosporogenesis (pollen formation) is initiated when:The mature embryo sac (female gametophyte) in flowering plants typically has:Pollination is best defined as the transfer of pollen from:Pollination by INSECTS is called:In a typical dicot embryo, the number of cotyledons is:In the fruit, the OVARY WALL develops into the:Parthenocarpy refers to:An anther is four-sided with four microsporangia, ___ in each lobe.Each microsporangium releases how many pollen grains when the anther splits?Pollen grains represent the male:Sporopollenin lets pollen exine survive:In a mature pollen grain, which cell is bigger with abundant food reserve?Carrot grass, Parthenium, came to India as a contaminant with imported:Rice and wheat pollen lose viability within about:The stalk that attaches an ovule to the placenta is the:The basal part of the ovule, opposite the micropyle, is the:A wheat ovary has one ovule; a papaya ovary has:The egg apparatus consists of one egg cell and two:Closed cleistogamous flowers give assured seed set even without:Wind-carried pollen must be:The tassels on a corn cob that wave in the wind are the:Water lily flowers rise above the water and are pollinated by:Wind and water pollinated flowers are usually not colourful and do not produce:Flowers pollinated by flies and beetles attract them with:Insects that eat nectar without pollinating are called:Continued self-pollination leads to:Which develops first after double fertilisation?Wheat, maize and castor seeds keep part of their endosperm. They are:A mature seed has moisture of only about:Which is the innermost wall layer of a microsporangium?How many microsporangia sit at the corners of a typical anther?Which substance forms the hard outer exine of a pollen grain?What is absent from the exine at the germ pores of a pollen grain?Which two substances make up the inner wall, the intine, of pollen?A mature pollen grain contains which two cells?Which weed that came with imported wheat causes pollen allergy in India?How long do rice and wheat pollen grains stay viable after release?In pollen banks, pollen is stored for years at -196 degrees C in what?Which part of the pistil acts as the landing platform for pollen?A gynoecium whose pistils are free from one another is called what?Which plant typically has a single ovule in its ovary?The junction between an ovule and its funicle is called what?The ovule opening left at the tip of the integuments is the what?What does meiosis of a megaspore mother cell produce?Embryo sac formation from one megaspore is termed what?How many mitotic divisions turn a functional megaspore into 8 nuclei?Where are the two polar nuclei located in the embryo sac?What does the egg apparatus consist of?Which structure at the synergid tip guides the pollen tube?Where are the three antipodal cells of the embryo sac located?Pollen reaching the stigma of a different plant is called what?Pollen moving to another flower of the same plant is called what?Genetically, geitonogamy is most similar to which pollination type?What are cleistogamous flowers?Cleistogamous flowers guarantee what even without pollinators?Which plant bears both chasmogamous and cleistogamous flowers?Which pair of freshwater plants is pollinated by water?How are water hyacinth and water lily flowers usually pollinated?In a corn cob, the silky ears seen are actually which parts?What protects pollen of water-pollinated plants from wetting?Which animals are the dominant biotic pollinators of flowering plants?Which plant depends on a moth that lays eggs in its ovary locule?Which genetic mechanism stops self-pollen from fertilising ovules?Plants like castor and maize with both flower sexes on one plant are?Papaya has male and female flowers on different plants; this is called?What does continued self-pollination often result in?Out-of-step pollen release and stigma receptivity discourages what?A pollen tube emerges from the grain through which structure?Through which part of the ovule does the pollen tube enter it?Events from pollen landing until the tube enters the ovule are called?What sugar solution strength suits a pollen germination slide?Which phenomenon is unique to flowering plants among plant groups?Triple fusion in the embryo sac yields what?Syngamy of a male gamete with the egg cell gives what?Tender coconut water represents which type of endosperm?Which seed keeps its endosperm even at maturity?Why do most zygotes divide only after some endosperm has formed?In a dicot embryo, which part lies above the cotyledons?The hypocotyl ends at its lower tip in which structure?What is the single cotyledon of a grass embryo called?Which sheath covers the radicle and root cap in grass embryos?What encloses the shoot apex and leaf primordia in a grass embryo?Which of these seeds is non-albuminous?What is the residual persistent nucellus in a seed called?Which seed shows persistent nucellus remnants called perisperm?What does the micropyle in a seed coat help to allow?What moisture content by mass do mature seeds typically have?Which fruit develops without fertilisation, being parthenocarpic?Parthenocarpy can be induced in plants by applying what?A viable 2000-year-old seed near the Dead Sea belonged to which plant?Formation of seeds without fertilisation is called what?Occurrence of more than one embryo in a seed is called what?Why can farmers reuse seeds of apomictic hybrid crops every year?Formation of microspores from a pollen mother cell is called what?Tapetal cells generally possess how many nuclei?What is the typical diameter range of a pollen grain?Which pollen cell floats inside the vegetative cell's cytoplasm?Why are pollen grains well preserved as fossils?