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Questions and Answers
What part of the flower do pollen grains settle on during pollination?
What part of the flower do pollen grains settle on during pollination?
- Ovary
- Sepal
- Stigma (correct)
- Style
The style is the part of the flower that connects the stigma to the ovary.
The style is the part of the flower that connects the stigma to the ovary.
True (A)
What nucleus directs the growth of the pollen tube?
What nucleus directs the growth of the pollen tube?
tube cell nucleus
What structure does the pollen tube grow down into during fertilization?
What structure does the pollen tube grow down into during fertilization?
The stigma secretes a ________ fluid to aid pollen germination.
The stigma secretes a ________ fluid to aid pollen germination.
The stigma is where the pollen grain germinates and produces a pollen tube.
The stigma is where the pollen grain germinates and produces a pollen tube.
What do pollen grains produce once they germinate?
What do pollen grains produce once they germinate?
Which structure contains the sperm cells in the flower?
Which structure contains the sperm cells in the flower?
Match the following parts of a flower with their functions:
Match the following parts of a flower with their functions:
The tip of the pollen tube absorbs sap and ______, releasing the two male gametes.
The tip of the pollen tube absorbs sap and ______, releasing the two male gametes.
Match the following components of flower reproduction with their descriptions:
Match the following components of flower reproduction with their descriptions:
Pollination and fertilization occur simultaneously in flowering plants.
Pollination and fertilization occur simultaneously in flowering plants.
What are the male reproductive structures of a flower called?
What are the male reproductive structures of a flower called?
What is the function of the enzymes secreted by the pollen tube?
What is the function of the enzymes secreted by the pollen tube?
The _______ is the enlarged part of the pistil that contains ovules.
The _______ is the enlarged part of the pistil that contains ovules.
The sperm cells are produced in the ovule.
The sperm cells are produced in the ovule.
What is the primary purpose of brightly colored petals in insect-pollinated flowers?
What is the primary purpose of brightly colored petals in insect-pollinated flowers?
The stamen consists of the ovary and style.
The stamen consists of the ovary and style.
What are the two parts of the stamen?
What are the two parts of the stamen?
The __________ is the flower stalk.
The __________ is the flower stalk.
Match the following components with their descriptions:
Match the following components with their descriptions:
Which nucleus in a pollen grain is responsible for forming the pollen tube?
Which nucleus in a pollen grain is responsible for forming the pollen tube?
Sessile flowers have a pedicel that connects to the receptacle.
Sessile flowers have a pedicel that connects to the receptacle.
What is the structure consisting of all the stamens of a flower called?
What is the structure consisting of all the stamens of a flower called?
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Study Notes
Pollination & Fertilization
- Mature pollen grains contain two sperm cells and a tube cell nucleus
- Pollen grain lands on the stigma of a mature flower
- Stigma secretes a sugary fluid
- Pollen grain germinates, producing a pollen tube
- Pollen tube grows down the style into the ovary
- Pollen tube enters the ovule through the micropyle
- Pollen tube's tip absorbs sap and bursts, releasing the two male gametes
Structure of a Flower & Stamen
- Receptacle: The enlarged end of the flower stalk that bears parts of the flower.
- Pedicel: The flower stalk.
- Sessile flowers: Flowers without a pedicel, directly attached to the plant base.
- Stamen: The male part of the flower.
- Androecium: The collective term for all the stamens in a flower.
- Anther: Produces pollen grains. Contains two lobes, each with two pollen sacs.
- Filament: Holds the anther in a suitable position for pollen dispersal.
- Pollen grains: Contain a haploid set of chromosomes.
- Pollen grain nucleus: Two nuclei: the generative nucleus and the pollen tube nucleus (vegetative nucleus)
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