Pollination and Flower Structure Quiz

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Questions and Answers

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.

True

What nucleus directs the growth of the pollen tube?

tube cell nucleus

What structure does the pollen tube grow down into during fertilization?

Ovary Signup and view all the answers

The stigma secretes a ________ fluid to aid pollen germination.

sugary Signup and view all the answers

The stigma is where the pollen grain germinates and produces a pollen tube.

False Signup and view all the answers

What do pollen grains produce once they germinate?

Pollen tube Signup and view all the answers

Which structure contains the sperm cells in the flower?

Pollen grain Signup and view all the answers

Match the following parts of a flower with their functions:

Stigma = Receives pollen grains Ovary = Contains ovules Style = Connects stigma to ovary Pollen tube = Delivers sperm to the egg Signup and view all the answers

The tip of the pollen tube absorbs sap and ______, releasing the two male gametes.

bursts Signup and view all the answers

Match the following components of flower reproduction with their descriptions:

Pollen grain = Contains male gametes Ovule = Contains egg cell Stigma = Pollen landing platform Style = Pathway for pollen tube Signup and view all the answers

Pollination and fertilization occur simultaneously in flowering plants.

False Signup and view all the answers

What are the male reproductive structures of a flower called?

stamens Signup and view all the answers

What is the function of the enzymes secreted by the pollen tube?

To digest the style Signup and view all the answers

The _______ is the enlarged part of the pistil that contains ovules.

ovary Signup and view all the answers

The sperm cells are produced in the ovule.

False Signup and view all the answers

What is the primary purpose of brightly colored petals in insect-pollinated flowers?

To attract insects for pollination Signup and view all the answers

The stamen consists of the ovary and style.

False Signup and view all the answers

What are the two parts of the stamen?

Anther and filament Signup and view all the answers

The __________ is the flower stalk.

pedicel Signup and view all the answers

Match the following components with their descriptions:

Anther = Produces pollen grains Filament = Supports the anther Pollen grains = Contain a haploid set of chromosomes Corolla = Composed of all the petals Signup and view all the answers

Which nucleus in a pollen grain is responsible for forming the pollen tube?

Vegetative nucleus Signup and view all the answers

Sessile flowers have a pedicel that connects to the receptacle.

False Signup and view all the answers

What is the structure consisting of all the stamens of a flower called?

Androecium Signup and view all the answers

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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Description

Test your knowledge on the process of pollination and the anatomy of flowers. This quiz covers the roles of pollen grains, stamen components, and the fertilization process in flowering plants. Perfect for students studying botany and plant biology.