Concept explainers
Where do the pollen grams of flowering plants develop?
- in the anthers of a flower
- in the carpels of a flower
- while being dispersed by wind, water, or animals
- within ovules
- within pistils
Introduction:
Flowering plants reproduce sexually. Sexual reproduction in plants involves a male portion and a female portion. Pollen grains represent the male portion of sexual reproduction in flowering plants. Pollen grains are microscopic in structure. It reaches the female portion either by swirling with the wind or by attaching itself to the sticky legs of the insects which visit the other flowers of same or different species
Answer to Problem 1TY
The correct answer is option (a) in the anthers of the flowers.
Explanation of Solution
Explanation/justification for the correct answer:
Option (a) in the anthers of the flowers. The anther is a part of the male reproductive whorl of the plant known as Androecium. It is usually bilobed with two chambers known as pollen-sacs, where pollen grains are produced.
Explanation for incorrect answer:
Option (b) in the carpels of the flower. Carpels are the unit of the female reproductive system which receives the pollen grains for fertilization. Hence, it has no role in the production of pollen grains.
Option (c) while being dispersed by wind, water or animals. Dispersion is a process associated with the transfer of seeds to faraway places so that they can get proper sunlight air and water to germinate. Pollen grains can move to other places with the help of air, water or animals, but dispersion is a process that follows after pollen formation. So this is not a correct option.
Option (d) within ovules. Ovules too are a part of the female reproductive organ or Gynoecium, which is a completely different whorl of the plant-associated with sexual reproduction in plants. Within ovule, cells divide to produce egg and other cells which are fertilized by the sperm cell present in the pollen grains. Thus we see that ovule mainly takes part in Fertilisation which comes much late after pollen formation. Thus this option is incorrect too.
Option (e) within pistils. The pistil is a part of the Female reproductive whorl of the plant It is often used to refer one carpel or many carpels fused together. Hence, this option is also incorrect as its role comes after pollen grain formation.
Pollen grains are the male portion of sexual reproduction in flowering plants. Hence, the correct answer is option (a) in the anthers of flowers.
Want to see more full solutions like this?
Chapter 31 Solutions
EBK PRINCIPLES OF BIOLOGY
- Identify the indicated structure (Saprolegnia). a. antheridium O b. oospore c.sperm d. auxospore e. tetraspore Of. zygosporearrow_forwardUsing information from the primary literature (several references have been provided as a starting point below) please answer the following question: Based on your review of the literature on rewilding, what are the major scientific pros and cons for rewilding? Please note that the focus of this assignment are the (biological) scientific issues associated with rewilding. As will be discussed in class, there are a number of non-scientific issues involved or implicated in rewilding, all ultimately affecting the public acceptability of rewilding. Although these issues are important – indeed, critical – in this assignment you should focus on the biological science issues and questions. Details: You must enumerate at least two pros and at least two cons. Your answer should be no more than 500 well-chosen words, excluding references. Think carefully about how best to organize and structure your answer. Aim for high information density: say a lot, but say it succinctly. Recall Nietzche’s…arrow_forwardUsing information from the primary literature (several references have been provided as a starting point below) please answer the following question: Based on your review of the literature on rewilding, what are the major scientific pros and cons for rewilding? Please note that the focus of this assignment are the (biological) scientific issues associated with rewilding. As will be discussed in class, there are a number of non-scientific issues involved or implicated in rewilding, all ultimately affecting the public acceptability of rewilding. Although these issues are important – indeed, critical – in this assignment you should focus on the biological science issues and questions. Details: You must enumerate at least two pros and at least two cons. Your answer should be no more than 500 well-chosen words, excluding references. Think carefully about how best to organize and structure your answer. Aim for high information density: say a lot, but say it succinctly. Recall Nietzche’s…arrow_forward
- Now draw a rough sketch of what the control data might look like if in addition to the specific binding, there was also a considerable amount of nonspecific binding (again using a normal dose/response curve) (do % total bound ligand vs concentration)arrow_forwardWhat are functions of cuboidal cells in the kidney? Select all that apply. Concentration of gases Dilution of chemicals Secretion of molecules Nutrition to tissues Support of tissues Absorption of moleculesarrow_forwardquestion1 In plants, epithelial tissue is only found as the outermost cell layer and acts as a barrier. In humans, epithelial tissue is found inside the body as well as on the surface. What function(s) does/do epithelial tissue carry out in humans? Select all that apply. Waste storage Filtration Oxygen transport Protection Diffusion Osmosis Absorptionarrow_forward
- What words best describes this organism? a. Unicellular/nonmotile Ob. unicellular/motile c. colonial/nonmotile d. colonial/motile e. multicelluar O f. siphonous g. none of thesearrow_forwardIdentify the phylum or class. a. Euglenophyta b. Dinoflagellata c. Bacillariophyceae d. Oomycetes e. Phaeophyceae O f. Myxomycota g. Xanthophyceae ○ h. Chrysophyceae i. Dictyosteliomycota O j. Rhodophyta Ok. Chlorophyceaens I. Charophyceaensarrow_forwardWhat is produced inside the indicated structure (Fucus). a. eggs O b. antheridia ○ c. sperm d. zygotes e. none of thesearrow_forward
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage LearningConcepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
- Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxBiology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage LearningBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning