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

//Multiple Choice

What is the primary advantage of sexual reproduction? {
    ~Faster reproduction
    =Genetic variation in offspring
    ~Requires only one parent
    ~Produces identical offspring
}

Sexual reproduction involves the fusion of\: {
    ~Vegetative cells
    =Gametes
    ~Spores
    ~Buds
}

Genetic variation in sexual reproduction is caused by\: {
    ~Cloning
    ~Mutation only
    =Recombination of genetic material
    ~Asexual division
}

Why is genetic variation important in a population? {
    ~It ensures uniformity in traits
    ~It reduces the chances of survival
    =It helps in adapting to environmental changes
    ~It decreases biodiversity
}

Which of the following is a key feature of sexual reproduction? {
    ~Offspring are identical to parents
    =Involves two parents
    ~No involvement of gametes
    ~No genetic variation
}

What is the male gamete in humans called? {
    ~Ovum
    =Sperm
    ~Zygote
    ~Embryo
}

The process of fusion of male and female gametes is called\: {
    =Fertilization
    ~Pollination
    ~Fragmentation
    ~Budding
}

Which of the following organisms reproduces sexually? {
    ~Amoeba
    ~Hydra
    =Humans
    ~Yeast
}

Sexual reproduction is advantageous over asexual reproduction because\: {
    ~It is faster
    ~It requires only one parent
    =It introduces genetic diversity
    ~It produces more offspring
}

Which of the following contributes to genetic variation in sexual reproduction? {
    ~Binary fission
    =Crossing over during meiosis
    ~Budding
    ~Fragmentation
}

//True or False

Sexual reproduction involves the fusion of male and female gametes. {T}

Offspring produced by sexual reproduction are genetically identical to their parents. {F}

Crossing over during meiosis leads to genetic variation. {T}

The zygote formed during sexual reproduction is diploid. {T}

Sexual reproduction is faster than asexual reproduction. {F}

Genetic variation helps organisms adapt to environmental changes. {T}

Pollination is a process involved in sexual reproduction in plants. {T}

Fertilization is the fusion of two somatic cells. {F}

In humans, gametes contain half the number of chromosomes as somatic cells. {T}

Sexual reproduction reduces biodiversity in a population. {F}

//Fill in the blanks

Sexual reproduction involves the fusion of ______. {
    ~Spores
    =Gametes
    ~Buds
    ~Cells
}

The process of fusion of male and female gametes is called ______. {
    ~Pollination
    =Fertilization
    ~Fragmentation
    ~Budding
}

Genetic variation in sexual reproduction occurs due to ______ during meiosis. {
    ~Mutation
    ~Binary fission
    =Crossing over
    ~Budding
}

The male gamete in humans is called ______. {
    ~Ovum
    ~Embryo
    =Sperm
    ~Zygote
}

Sexual reproduction leads to ______ in the offspring. {
    =Genetic variation
    ~Uniformity
    ~Faster reproduction
    ~Identical traits
}

The zygote is formed as a result of the fusion of ______. {
    ~Two somatic cells
    =Two gametes
    ~Two spores
    ~Two embryos
}

The female gamete in humans is called ______. {
    =Ovum
    ~Sperm
    ~Zygote
    ~Embryo
}

Sexual reproduction is important for ______ in a population. {
    ~Genetic uniformity
    =Genetic diversity
    ~Faster reproduction
    ~Identical traits
}

In plants, fertilization occurs in the ______. {
    ~Roots
    ~Leaves
    =Ovary
    ~Stem
}

The process of formation of gametes is called ______. {
    ~Fertilization
    =Gametogenesis
    ~Pollination
    ~Fragmentation
}

//Numericals

If a human zygote contains 46 chromosomes, how many chromosomes are present in each gamete? {
    =23
    ~46
    ~92
    ~69
}

In meiosis, if a parent cell has 16 chromosomes, how many chromosomes will each gamete have? {
    ~32
    =8
    ~16
    ~4
}

A plant produces 100 seeds after sexual reproduction. If 60% of the seeds germinate, how many seeds will grow into plants? {
    ~40
    =60
    ~80
    ~100
}

In a flowering plant, 20 ovules are present in the ovary. If fertilization occurs in 75% of the ovules, how many seeds will be formed? {
    ~10
    =15
    ~20
    ~5
}

A species has 24 chromosomes in its somatic cells. How many chromosomes will be present in its gametes? {
    =12
    ~24
    ~48
    ~6
}

If a farmer crosses two varieties of plants and obtains 200 seeds, and 80% of the seeds are viable, how many seeds will grow into plants? {
    ~120
    =160
    ~180
    ~200
}

In a sexually reproducing organism, if 4 offspring are produced, and 2 show new traits due to variation, what is the percentage of variation in the offspring? {
    ~25%
    =50%
    ~75%
    ~100%
}

If crossing over occurs in 80% of meiotic divisions in a cell, how many divisions out of 50 will show crossing over? {
    ~20
    ~30
    =40
    ~50
}

A population of organisms reproduces sexually. If 10 generations produce 1,000 offspring, and 10% show beneficial variations, how many offspring have beneficial variations? {
    =100
    ~200
    ~500
    ~800
}

A plant has 40 chromosomes in its somatic cells. After meiosis, how many chromosomes will be in each pollen grain? {
    ~10
    =20
    ~40
    ~80
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Male gamete in humans -> Sperm
=Female gamete in humans -> Ovum
=Fusion of gametes -> Fertilization
=Genetic variation -> Crossing over
}


//******** END **********