$CATEGORY: Science - Khan Academy/8.How do Organisms Reproduce?/8.How do Organisms Reproduce?--Sexual Reproduction

//Multiple Choice

What is pollination? {
    ~Transfer of pollen from the stigma to the anther
    =Transfer of pollen from the anther to the stigma
    ~Fusion of gametes
    ~Formation of seeds
}

Which type of pollination occurs when pollen is transferred from the anther to the stigma of the same flower? {
    ~Cross-pollination
    =Self-pollination
    ~Wind pollination
    ~None of the above
}

In which of the following does cross-pollination occur? {
    ~Rose
    ~Pea
    ~Wheat
    =Corn
}

Which of the following is a characteristic of self-pollination? {
    ~Requires pollinators like bees or wind
    ~Occurs between different flowers of the same plant
    =Occurs within the same flower or between flowers of the same plant
    ~Leads to genetic variation
}

What is required for cross-pollination? {
    ~Pollen from the same flower
    =Pollen from another plant of the same species
    ~Pollen from a different species
    ~No pollen is required
}

Which of the following is a pollinator for cross-pollination? {
    ~Wind
    ~Water
    ~Insects
    =All of the above
}

Which of the following plants undergoes self-pollination? {
    ~Sunflower
    =Pea
    ~Papaya
    ~Mango
}

Which of the following is an advantage of self-pollination? {
    ~Increases genetic variation
    ~Requires external pollinators
    =Ensures pollination even in the absence of pollinators
    ~Requires energy from external sources
}

Cross-pollination leads to _______ in the offspring. {
    =Increased genetic variation
    ~Decreased genetic variation
    ~No change in genetic variation
    ~Reduced fertility
}

Which of the following flowers is most likely to undergo self-pollination? {
    ~Rose
    ~Lily
    ~Orchid
    =Pea
}

//True or False

Self-pollination occurs when pollen is transferred from the anther of one flower to the stigma of another flower of the same plant. {F}

Cross-pollination requires external agents like wind, water, or insects to transfer pollen. {T}

Self-pollination always results in greater genetic variation compared to cross-pollination. {F}

In cross-pollination, pollen is transferred from the anther of one plant to the stigma of another plant of the same species. {T}

Cross-pollination is less common in plants that have both male and female reproductive organs in the same flower. {T}

Self-pollination is more efficient in terms of pollination success because it does not depend on external pollinators. {T}

In cross-pollination, the plants involved must be of different species. {F}

Wind-pollinated plants typically have large, colorful flowers to attract pollinators. {F}

Self-pollination can occur in both unisexual and bisexual flowers. {F}

Cross-pollination increases the chances of genetic diversity in offspring. {T}

//Fill in the blanks

Self-pollination occurs when pollen is transferred from the _______ to the stigma of the same flower. {
    =Anther
    ~Carpel
    ~Ovary
    ~Style
}

In cross-pollination, pollen is transferred from the anther of one flower to the _______ of another flower. {
    =Stigma
    ~Ovule
    ~Style
    ~Filament
}

Self-pollination is more common in _______ plants. {
    ~Wind-pollinated
    ~Insect-pollinated
    =Monoecious
    ~Bisexual
}

The main advantage of self-pollination is that it does not require _______ for pollen transfer. {
    ~Wind
    ~Water
    =Pollinators
    ~Seeds
}

In cross-pollination, pollen is transferred between flowers of the same _______. {
    =Species
    ~Genus
    ~Family
    ~Kingdom
}

Pollination by insects is called _______ pollination. {
    ~Water
    ~Wind
    =Entomophily
    ~Zoophily
}

Cross-pollination generally leads to _______ genetic variation. {
    =Increased
    ~Decreased
    ~No change in
    ~None of the above
}

In self-pollination, the pollen is transferred to the _______ of the same flower. {
    =Stigma
    ~Anther
    ~Style
    ~Ovary
}

Wind-pollinated plants, like grasses, undergo _______ pollination. {
    =Cross
    ~Self
    ~Water
    ~Insect
}

Self-pollination can occur in _______ flowers. {
    ~Unisexual
    =Bisexual
    ~Dioecious
    ~None of the above
}

//Numericals

A flower has 8 anthers, and each anther produces 1000 pollen grains. How many pollen grains are produced in total? {
    =8000
    ~1000
    ~80000
    ~None of the above
}

In a population of 200 plants, 25% of the plants undergo self-pollination. How many plants undergo self-pollination? {
    ~25
    =50
    ~75
    ~100
}

A plant has 5 flowers, and each flower produces 200 pollen grains. How many pollen grains are produced in total? {
    =1000
    ~1500
    ~2000
    ~2500
}

In a population of 500 plants, 40% undergo cross-pollination. How many plants undergo cross-pollination? {
    ~100
    ~150
    =200
    ~250
}

A plant produces 4 flowers, and each flower has 6 stamens. If each stamen produces 500 pollen grains, how many pollen grains are produced in total? {
    ~1000
    ~6000
    =12000
    ~24000
}

A plant has 10 flowers, and 30% of them undergo self-pollination. How many flowers undergo self-pollination? {
    ~2
    =3
    ~4
    ~5
}

A plant has 6 flowers, and each flower produces 200 pollen grains. How many pollen grains are produced in total? {
    ~600
    =1200
    ~1500
    ~2000
}

In a field of 1000 plants, 60% undergo cross-pollination. How many plants undergo cross-pollination? {
    ~400
    ~500
    =600
    ~700
}

A flower has 10 stamens, and each stamen produces 1000 pollen grains. If only 50% of the pollen grains are transferred to another flower, how many pollen grains are transferred? {
    =5000
    ~10000
    ~20000
    ~50000
}

A plant has 12 flowers, and each flower produces 250 pollen grains. How many pollen grains are produced in total? {
    =3000
    ~2500
    ~3500
    ~4000
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Self pollination -> Occurs within the same flower or between flowers of the same plant
=Cross pollination -> Requires external pollinators like insects or wind
=Wind pollinated plants -> Examples include Corn and grasses
=Insect pollinated plants -> Examples include roses and Sunflowers
}


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