IA MODIFIED MASTERING BIOLOGY WITH E TEX
12th Edition
ISBN: 9780136781752
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 38, Problem 3TYU
Double fertilization means that
- (A) flowers must be pollinated twice to yield fruits and seeds.
- (B) every egg must receive two sperm to produce an embryo.
- (C) one sperm is needed to fertilize the egg, and a second sperm is needed to fertilize the polar nuclei.
- (D) every sperm has two nuclei.
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A fruit is(A) a mature ovary.(B) a mature ovule.(C) a seed plus its integuments.(D) an enlarged embryo sac.
12) Why do you say that fertilization in seed plants is independent of water?
A) Spermatid cells are not necessary for fertilization to occur in seed plants.B) Seed plants use pollen instead of spermatid cells for fertilization.C) Spermatid cells are carried by pollen grains.D) Which spermatid cells in seed plants are capable of resisting desiccation indefinitely.
Plants with ovaries having only one or a few ovules are generally pollinated by:
(a) bees
(b) butterflies
(c) birds
(d) wind
Chapter 38 Solutions
IA MODIFIED MASTERING BIOLOGY WITH E TEX
Ch. 38.1 - Distinguish between pollination and fertilization.Ch. 38.1 - Prob. 2CCCh. 38.1 - MAKE CONNECTIONS Does the life cycle of humans...Ch. 38.2 - What are three ways that flowering plants avoid...Ch. 38.2 - Prob. 2CCCh. 38.2 - Prob. 3CCCh. 38.3 - Compare traditional plant-breeding methods with...Ch. 38.3 - Why does Bt maize have less fumonisin than non-GM...Ch. 38.3 - WHAT IF? In a few species, chloroplast genes are...Ch. 38 - What changes occur to the four types of floral...
Ch. 38 - Prob. 38.2CRCh. 38 - Prob. 38.3CRCh. 38 - A fruit is (A) a mature ovary. (B) a mature ovule....Ch. 38 - Prob. 2TYUCh. 38 - Double fertilization means that (A) flowers must...Ch. 38 - Prob. 4TYUCh. 38 - Prob. 5TYUCh. 38 - Prob. 6TYUCh. 38 - The black dots that cover strawberries are...Ch. 38 - DRAW IT Draw and label the parts of a flower.Ch. 38 - Prob. 9TYUCh. 38 - Prob. 10TYUCh. 38 - SCIENCE, TECHNOLOGY, AND SOCIETY Humans have...Ch. 38 - WRITE ABOUT A THEME: ORGANIZATION In a short essay...Ch. 38 - SYNTHESIZE YOUR KNOWLEDGE This colorized SEM shows...
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- Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following. (a) The animals are small in size and want to produce more offsprings. (b) Food is available in plenty in water. (c) To ensure better chance of fertilisation. (d) Water promotes production of large number of gametes.arrow_forwardFertilization: a) Briefly describe the process of fertilization in humans, b) identifying key aspects that stop sperms from different species to fertilize human oocytes, and c) identifying also key aspects that prevent polyspermy.arrow_forwardCleistogamous flowers are invariably autogamous because” (a) These flowers do not open at all. (b) There is no chance of cross – pollen landing on the stigma. (c) These flowers have exposed anthers and stigma. (d) These flowers are wind pollinated.arrow_forward
- I marked d but it's incorrect. Explain pleasearrow_forwardWhy is a second polar body expelled after fertilisation? a) To remove excess cytoplasm b) Because the oocyte must reactivate the incomplete meiosis before fusing with the sperm c) Before fusion with the sperm it must complete mitosis d) The fertilised oocyte is not a haploid cell until it expels the sperms mitochondriaarrow_forwardDefine the following terms:(a) aestivation (b) placentation (c) actinomorphic (d) zygomorphic (e) superior ovary (f) perigynous flower(g) epipetalous stamenarrow_forward
- Of the three polar bodies , one came from an unequal division of the ovum , but from where did the other two arise ? a) What you really see are two polar bodies and the sperm that will fertilize the egg b ) One is an undeveloped primary oocyte that failed to mature . c ) The division of the first polar body into two polar bodies . d ) There were originally four polar bodies and one disappeared .arrow_forwardHow many meiotic divisions are required for the formation of 100 pollen grains ? (a) 100 (b) 50 (c) 25 (d) 26arrow_forwardOf the three polar bodies , one came from an unequal division of the ovum , but from where did the other two arise ? b ) A secondary division of the mature egg . c ) One is an undeveloped primary oocyte that failed to mature . d ) There were originally four polar bodies and one disappeared e)The division of the first polar body into two polar bodies .arrow_forward
- The most notable differences between gamete formation in most animals and gamete formation in plants is that ______________. a) plants produce gametes in somatic tissue, whereas animals produce gametes in germ tissue b) plants produce gametes by mitosis, whereas animals produce gametes by meiosis c) plants produce only one of each gamete, but animals produce many gametes d) plants produce gametes that are diploid, but animals produce gametes that are haploidarrow_forwardIn human beings, the correct sequence of events during reproduction is: (a) gamete formation, fertilisation, zygote, embryo (b) embryo, zygote, fertilisation, gamete formation (c) fertilisation, gamete formation, embryo, zygote (d) gamete formation, fertilisation, embryo, zygotearrow_forwardin a mung bean, there is an attachment of the funiculus to the ovule. what do you think is the position of the ovule from which this seed is derived?arrow_forward
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