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- In flowrers, the structures that produce male gametophytes are called ______; the structures that produce female gametophytes are called _______. a. carpels; stamens b. pollen grains; flowers c. anthers; carpels d. megaspores; microsporestte cro o n of a owr Which of the fotowing Female parts Male parte P. T Q. S. T P. R (1) (2) P.R Q. S. T Q. S (3) (4) P. R. T Study the diagram below. Which of the following options correctly matches the part of the tlower to ts function? Part Part of the flower Function (1) Ovary Develops into a seed Anther Produces pollen grains (2) Stigma Attracts insects for pollination (3) Y Petal Develops into a fruit after tertilisetion (4) 2020-2022 The Lei No part of this publication may be reproduced wiName specific structure "A" ovary Name specific structure "B" anther A- MacBook Pro B
- A Your A Your Class S Launc 9 Launc S Launc A Foren E Fo X Foren O Grade M (be Foren monr ent/d/1JRG2bCkck5BmrGpQDI5IbLXeULosgV-36SOBBKS F8M/edit Request PARTS OF A GYMNOSPERM #23 Ovule Single scale (sporophyll) Megasporangium Megарoreocytе |#24 Integument Micropyie #25 Mature sporophyte Microsporangium SporophyllDate: F/21 Gr-5 B/G ub: SCIENCE ither print to complete this worksheet or write only answers in the notebook. In this exercise. you wiil compiete sentences about poiliination and fertilization. Use the words in the box to elp you complete the sentences. You will use some words more than once. Wind Insects Seeds Pollen Stigma Anthers Nectar male cell Anthers Ovary Fertilization 1. The of flowers make a yellow powder called to the of 2. Pollination happens when pollen moves from the a flowers of the same type. 3. Some plants use to blow the pollen far away. 4. Insects get on their bodies when they visit flowers to feed on 5. The and eggs join together inside the during This is how is formed, 6. The becomes the fruit. II. Circle whether the statements are True or false True False Egg cells are made in an ovary. True False transfer of pollen to stigma is called pollination. True False Fertilization happens in the ovary. Frue False An egg cell must be fertilized to become an embryo. True…identufy the vesicouterine pouch B A 0 0 0 0 С В A E D E
- Figure 26.8 At what stage dees the diploid zygote form? when the female cone begins to bud from the tree at fertilization when the seeds drop from the tree when the pollen tube begins to growExposure to _______ can trigger seed germination. a. light b. cold c. smoke d. all can be triggersStuck Sperm Cells lining the epididymis secrete a glycoprotein (beta-defensin) that coats sperm and facilitates their passage through cervical mucus. There are two common alleles for human beta-defensin: a wild-type allele (wt) and an allele with a deletion (del). To find out if this genetic variation could affect fertility, Gary Cherr and his colleagues tested the ability of sperm from men with different genotypes to pass through a gel barrier. The barrier was designed to simulate cenrical mucus. The researchers placed sperm on one side of the gel, then used a video camera to record how many passed into the gel over time. FIGURE 41.12 illustrates their results. FIGURE 41.12 Effect of beta defensin genotype on the ability of sperm to penetrate a gel that simulates cervical mucus. Sperm from 16 men was tested: 4wt/wt, 6wt/del, and 6 del/del. Fresh sperm were placed on one side of the gel, and a video camera was focused on a region 2.75 mm into the gel. The number of sperm in this region was recorded at one-minute intervals for six minutes. Sperm numbers shown are averages. Bars indicate range. After four minutes, how many sperm from men with a wild-type allele were in the camera's view an average?
- BPA and Abnormal Meiosis In 1998, researchers at Case Western University were studying meiosis in mouse oocytes (germ cells) when they saw an unexpected and dramatic increase of abnormal events (FIGURE 12.6). Improper segregation of chromosomes during meiosis is one of the main causes or human genetic disorders. The spike in abnormal meiosis began right after the mouse facility started washing the animals' plastic cages and water bottles in a new, alkaline detergent. The detergent had damaged the plastic, which as a result was leaching bisphenol A (BPA). BPA is a synthetic chemical that mimics estrogen, the main female sex hormone in animals. Though it has since been banned for use in baby bottles, BPA is still widely used to manufacture other plastic items and epoxies (such as the coating on the inside of metal cans of food). BPA-free plastics are often manufactured with a related compound, bisphenol S (BPS), that has effects similar to BPA. FIGURE 12.6 Abnormalities in meiosis that occurred after exposure to BPA. Top, the most abnormal meiosis events occurred in mice that were housed in damaged plastic caging with damaged plastic bottles. Damaged plastic releases BPA. Bottom, fluorescent micrographs show the chromosomes (red) and spindle (green) in nuclei of mouse germ cells in metaphase I. A Normal metaphase; BD abnormal metaphase. What percentage of mouse oocytes displayed abnormalities of meiosis with no exposure to damaged caging?Cotyledons develop as pan of ________. a. carpels b. accessory fruits c. embryo sporophytes d. flowersWhat process is occuring indicated by the letter A Name the strcuture indicated by the letter B Name the strcuture indicated by the letter C What process is occuring between zygote to embryo stage indicated by the letter D? What process indicated by letter E is occuring that result in the plant zygote? What strcuture is in the circle indicated by the letter F? What word is used to describe the strcuture indicated by the letter G? What are those small strcutures that are settling on this flower part indicated by the letter H.