10 - Science - 04. Biology - Reproduction In Plants

1. If a water soaked seed is pressed, a small drop of water comes out through _________

Stomata

Lenticel

Micropyle

Radicle

When a water soaked seed is pressed, a small drop of water comes out through the micropyle. The micropyle is a small opening in the seed coat through which water can be released. This opening allows for the exchange of gases and the release of excess water, ensuring that the seed does not become waterlogged and can continue to respire properly.

Explanation

When a water soaked seed is pressed, a small drop of water comes out through the micropyle. The micropyle is a small opening in the seed coat through which water can be released. This opening allows for the exchange of gases and the release of excess water, ensuring that the seed does not become waterlogged and can continue to respire properly.

2. In sexual reproduction of lowering plants, the first event involved in this is ___________

Fertilization

Germination

Regeneration

Pollination

In sexual reproduction of flowering plants, pollination is the first event that occurs. Pollination is the transfer of pollen from the male reproductive organ (anther) to the female reproductive organ (stigma) of a flower. This can occur through various means such as wind, water, or animal pollinators like bees or birds. Once pollination occurs, fertilization can take place, leading to the formation of seeds and fruits. Germination and regeneration are not directly related to the first event in sexual reproduction, making them incorrect options.

Explanation

In sexual reproduction of flowering plants, pollination is the first event that occurs. Pollination is the transfer of pollen from the male reproductive organ (anther) to the female reproductive organ (stigma) of a flower. This can occur through various means such as wind, water, or animal pollinators like bees or birds. Once pollination occurs, fertilization can take place, leading to the formation of seeds and fruits. Germination and regeneration are not directly related to the first event in sexual reproduction, making them incorrect options.

3. This is the one of the methods of reproduction in unicellular organisms like amoeba and bacteria in which they split into two equal halves and produce new ones is called_________

Fragmentation

Binary fission

Budding

Spore formation

Binary fission is the correct answer because it accurately describes the method of reproduction in unicellular organisms like amoeba and bacteria, where they divide into two equal halves to produce new organisms. Fragmentation refers to the breaking of an organism into pieces, budding is the formation of a new organism from an outgrowth on the parent organism, and spore formation is the production of specialized reproductive cells. None of these processes accurately describe the method of reproduction described in the question.

Explanation

Binary fission is the correct answer because it accurately describes the method of reproduction in unicellular organisms like amoeba and bacteria, where they divide into two equal halves to produce new organisms. Fragmentation refers to the breaking of an organism into pieces, budding is the formation of a new organism from an outgrowth on the parent organism, and spore formation is the production of specialized reproductive cells. None of these processes accurately describe the method of reproduction described in the question.

4. The disadvantage of self pollination is _______

There is no wastage of pollen grains

The seeds are less in number

Self pollination is sure in bisexual flowers

Flowers need not depend on agents of pollination

The disadvantage of self pollination is that the seeds produced are less in number.

Explanation

The disadvantage of self pollination is that the seeds produced are less in number.

5. The fertilized ovary is a fruit. The fruit develops from a single lower with multi carpellary, apocarpous superior ovary is _____

Aggregate fruit

Composite fruit

Simple fruit

Multiple fruit

An aggregate fruit is formed from a single flower with multiple separate carpels, each of which develops into a small fruit called a fruitlet. These fruitlets are attached to a central receptacle, giving the appearance of a single fruit. Therefore, the correct answer is aggregate fruit.

Explanation

An aggregate fruit is formed from a single flower with multiple separate carpels, each of which develops into a small fruit called a fruitlet. These fruitlets are attached to a central receptacle, giving the appearance of a single fruit. Therefore, the correct answer is aggregate fruit.

6. The mango fruit is called as stone fruit. because it has _________

Skinny epicarp

Stony mesocarp

Fleshy endocarp

Hard endocarpHard endocarpHard endocarp

The mango fruit is called a stone fruit because it has a hard endocarp. The endocarp is the innermost layer of the fruit, and in the case of mangoes, it is hard and stony. This hard endocarp surrounds the seed or pit of the fruit, giving it the characteristic of a stone fruit.

Explanation

The mango fruit is called a stone fruit because it has a hard endocarp. The endocarp is the innermost layer of the fruit, and in the case of mangoes, it is hard and stony. This hard endocarp surrounds the seed or pit of the fruit, giving it the characteristic of a stone fruit.

7. The product of triple fusion which acts as nutritive tissue for the development of embryo is ______

Zygote

Placenta

Scutellum

Endosperm

The endosperm is the correct answer because it is the tissue formed as a result of triple fusion in angiosperms. It acts as a nutritive tissue for the developing embryo, providing it with essential nutrients for growth and development. The endosperm is rich in starch, proteins, and other nutrients, and it is usually consumed by the growing embryo during germination.

Explanation

The endosperm is the correct answer because it is the tissue formed as a result of triple fusion in angiosperms. It acts as a nutritive tissue for the developing embryo, providing it with essential nutrients for growth and development. The endosperm is rich in starch, proteins, and other nutrients, and it is usually consumed by the growing embryo during germination.

8. Pick out the wrong statement.

In a dicot seed there is a short longitudinal whitish ridge is called the raphae

There is a minute opening in dicot seed is known as micropyle.

The rudimentary stem portion known as radicle.

The rudimentary root portion is called radicle

The statement "The rudimentary stem portion known as radicle" is incorrect. The radicle is actually the rudimentary root portion of a seed, not the stem portion.

Explanation

The statement "The rudimentary stem portion known as radicle" is incorrect. The radicle is actually the rudimentary root portion of a seed, not the stem portion.

9. Which of the following statement is true?

Thin walled non mobile spores are called zoospores

A motile asexual spore produced by some algae bacteria and fungi are Akinetes

Uninucleate non-motile asexual spores are produced by the fungus are called conidia

Thick walled vegetative cells produced by the algae during adverse conditions are called aplanospores

The correct answer is "Uninucleate non-motile asexual spores are produced by the fungus are called conidia." Conidia are a type of asexual spore produced by fungi that are uninucleate (contain only one nucleus) and non-motile (do not have the ability to move). These spores are important for the dispersal and reproduction of fungi.

Explanation

The correct answer is "Uninucleate non-motile asexual spores are produced by the fungus are called conidia." Conidia are a type of asexual spore produced by fungi that are uninucleate (contain only one nucleus) and non-motile (do not have the ability to move). These spores are important for the dispersal and reproduction of fungi.

10. Consider the following statement regarding the dispersal of fruit by wind and select the correct answer.

Fruits and seeds dispersed with a sudden jerk by an explosive mechanism.

Fruits of tridax are carry a persistent calyx modified into pappus.

The fruits of xanthium have sharp pointed stiff hooks.

The mesocarp of coconut is fibres.

The correct answer is "Fruits of tridax are carry a persistent calyx modified into pappus." This statement suggests that the fruits of tridax have a persistent calyx, which is a structure that typically withers and falls off after the fruit matures. However, in the case of tridax, the calyx is modified into a pappus, which helps in wind dispersal of the fruit. The pappus is a structure that aids in the dispersal of fruits and seeds by wind.

Explanation

The correct answer is "Fruits of tridax are carry a persistent calyx modified into pappus." This statement suggests that the fruits of tridax have a persistent calyx, which is a structure that typically withers and falls off after the fruit matures. However, in the case of tridax, the calyx is modified into a pappus, which helps in wind dispersal of the fruit. The pappus is a structure that aids in the dispersal of fruits and seeds by wind.