Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 33, Problem 3Q
Summary Introduction
To review:
The formation of different layers of tissues in roots in a cylinder from the group of initial cells.
Introduction:
The root apical meristem (RAM) is present at the root apex of the plant, which consists of undifferentiated mass of totipotent (ability to divide) cells and gives rise to the different structures of the root. Several asymmetrical cell divisions and differentiation occur in RAM that leads to the formation of the various layers of root tissues.
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Chapter 33 Solutions
Life: The Science of Biology
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- (a) Describe the role of mitosis in the growth of a plant. (b) Explain why there are more cells observed in mitosis in the root tip than in the woody stem.arrow_forwardArrange the following flower and fruit development processes in order. (1st step to 5th step)The microspore mother cell produces haploid microspores. => stepThe flower produces pollen grains that will land on the stigma. => StepThe tube cell forms the pollen tube, anchoring on the synergid. => StepFirst sperm will fertilize the egg to form the zygote (becoming the embryo later on). => StepThe ovary wall enlarges forming the pericarp. => Steparrow_forwardMitotic Cell division occurs in dogs, potato, zebra, and parrots cells. Which character will be absent in potato plants but present in dogs, zebra, and parrots cells? a. Root apical meristems are present where mitosis occurs. b. The resulting cells will contain exact numbers of chromosomes comparing parental cells. c. Star shaped Aster formation occurs around centrioles. d. Cell plate formation occurs.arrow_forward
- The megaspore in most flowering plants grows into a megagametophyte that has seven cells and eight nuclei. Name and describe the seven cells.arrow_forwardWhat region of a root has the most mitotic activity?arrow_forwardThis figure summarises the life cycle of a seed plant. The blue circles named A and B represent the sexually mature individual of each phase of the life cycle. 1) What is this life cycle called? 2) Plant B is in the diploid phase. What is another name for this plant? 3) If A is the haploid phase, in which phase would you find sepals? Write just the letter of the individual corresponding to the correct phase 4) If B is the haploid phase, in which phase would you find synergids? Write just the letter of the individual corresponding to the correct phase 5) If B is the diploid phase, in which phase would you find the nucellus? Write just the letter of the individual corresponding to the correct phase 6) If A is the diploid phase, in which phase would you find the sperm cells? Write just the letter of the individual corresponding to the correct phase 7) If A is the diploid phase, in which phase would you find selection on flower colour? Write just the letter of the individual corresponding…arrow_forward
- Cells in the stem of a seedling that is grown in the dark orient their microtubules horizontally. How would you expect this to affect the growth of the plant?arrow_forwardCite briefly discuss some problems related to plant embryogenesis.arrow_forwardCh. 22-1 Early botanists admired ferns but found their life cycle perplexing. In the 1700s, they learned to propagate ferns by sowing what appeared to be tiny dust-like "seeds" from the undersides of fronds. Despite many attempts, the scientists could not find the pollen source, which they assumed must stimulate these "seeds" to develop. Imagine you could write to one of these botanists. Compose a note that would clear up the confusion.arrow_forward
- After pollen lands on a stigma, it is far away from the ovule with the megagametophyte, which holds the egg (the megagamete). How are the two sperm cells transported from the stigma to the egg?arrow_forwardSince you're done with your study of plant tissues, you may now answer the questions about them below. 1. How do meristems accomplish the production of new, mitotically healthy cells? 2. What is indeterminate growth in plants? 3. What is de-differentiation in plant cells?arrow_forwardYou are studying a type of plant known as " rockcress" or Arabidopsis sp. You discover a mutant in which the central cell of the female gametophyte cannot be fertilized. What structure will not form in these mutant plants? Synergids Pollen tube Endosperm Egg cellarrow_forward
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