Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 53m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport1h 2m
- Water Potential
  1h 2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

36. Plant Reproduction

Flowers

General Biology

36. Plant Reproduction

Flowers

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1:28 minutes

Problem 1

Textbook Question

Evaluate these statements about double fertilization. Select True or False for each sentence.
T/FTwo zygotes are formed, but only one survives.
T/FOne sperm fuses with an egg while the other sperm fuses with polar nuclei.
T/FIt results in the formation of a diploid embryo and triploid endosperm.
T/FBoth sperm involved in double fertilization form within the same pollen tube.

Verified step by step guidance

Understand the concept of double fertilization in angiosperms, which involves two sperm cells. One sperm cell fertilizes the egg cell, forming a diploid zygote, while the other sperm cell fuses with two polar nuclei to form a triploid endosperm.

Evaluate the statement 'Two zygotes are formed, but only one survives.' In double fertilization, only one zygote is formed from the fusion of one sperm with the egg cell. The other sperm cell does not form a zygote but contributes to the formation of the endosperm.

Consider the statement 'One sperm fuses with an egg while the other sperm fuses with polar nuclei.' This accurately describes the process of double fertilization, where one sperm cell fertilizes the egg and the other fuses with the polar nuclei.

Analyze the statement 'It results in the formation of a diploid embryo and triploid endosperm.' This is true, as the fertilization of the egg by one sperm results in a diploid embryo, and the fusion of the other sperm with the polar nuclei results in a triploid endosperm.

Review the statement 'Both sperm involved in double fertilization form within the same pollen tube.' This is true, as both sperm cells are delivered to the ovule through the same pollen tube during the process of fertilization.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Double Fertilization

Double fertilization is a unique process in flowering plants where two sperm cells from a pollen grain fertilize two different cells within the ovule. One sperm cell fuses with the egg cell to form a diploid zygote, while the other sperm cell fuses with two polar nuclei to form a triploid endosperm, which provides nourishment to the developing embryo.

Pollen Tube Formation

The pollen tube is a structure that forms after a pollen grain lands on the stigma of a flower. It grows down the style to reach the ovule, allowing the sperm cells to travel to the egg and polar nuclei. Both sperm cells involved in double fertilization are formed within the same pollen tube, ensuring they reach the ovule simultaneously for fertilization.

Zygote and Endosperm Formation

In double fertilization, the fusion of one sperm with the egg cell results in the formation of a diploid zygote, which will develop into the embryo. The fusion of the second sperm with the polar nuclei results in the formation of a triploid endosperm, which serves as a food reserve for the growing embryo, supporting its development within the seed.