Table of Contents
Chapter 12 – Reproduction in Plants-MCQs (Solved Worksheet)
What is the main benefit of genetic diversity in plants obtained through sexual reproduction?
A) Uniformity in plant traits
B) Faster propagation of plants
C) Adaptability and evolution of species
D) Quick maturity of plants
Correct Answer- C) Adaptability and evolution of species
Explanation- Genetic diversity, which results from sexual reproduction involving two parents, is important for the adaptability and evolution of plant species.
Which part of the plant is critical for sexual reproduction?
A) Roots
B) Leaves
C) Flowers
D) Buds
Correct Answer- C) Flowers
Explanation- Flowers are the reproductive structures in plants that facilitate sexual reproduction, resulting in the production of seeds.
Also Check – Rapid Revision – Class 7 Science- Chapter 12 – Reproduction in Plants
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What is vegetative propagation?
A) A type of sexual reproduction involving flowers
B) A form of asexual reproduction using vegetative parts of the plant
C) The process of pollination and fertilisation in plants
D) The method by which plants disperse their seeds
Correct Answer- B) A form of asexual reproduction using vegetative parts of the plant
Explanation- Vegetative propagation is a form of asexual reproduction where new individuals grow from vegetative parts, such as stems, roots, or leaves, rather than from seeds.
Which structure in plants is essential for vegetative propagation?
A) Flower buds
B) Roots
C) Seeds
D) Vegetative buds
Correct Answer- D) Vegetative buds
Explanation- Vegetative buds, which are capable of developing into new shoots or plants, play a crucial role in vegetative propagation.
Also Check – Class 7- Chapter 8 – Reproduction in Plants – 6 Worksheets Solved and Unsolved
In the context of vegetative propagation, what is the significance of nodes?
A) They produce the plant’s flowers.
B) They are where new individuals sprout in asexual reproduction.
C) They are the points where seeds are formed.
D) They are where leaves attach to the stem, capable of giving rise to new plants.
Correct Answer- D) They are where leaves attach to the stem, capable of giving rise to new plants.
Explanation- Nodes are points on the stem where leaves arise and are important in vegetative propagation, as new plants can sprout from these nodes.
Which of the following is not a method of vegetative propagation?
A) Using potato eyes
B) Pollination
C) Leaf buds
D) Detached body parts
Correct Answer- B) Pollination
Explanation- Pollination is a part of sexual reproduction, not asexual reproduction like vegetative propagation.
What is the primary role of the buds located on the margins of Bryophyllum leaves?
A) To conduct photosynthesis
B) To absorb nutrients
C) To sprout into new plants
D) To attract pollinators
Correct Answer- C) To sprout into new plants
Explanation- The buds located on the margins of Bryophyllum leaves can sprout into new plants when the leaves fall onto moist soil.
Why is vegetative propagation particularly beneficial for commercial crops?
A) It preserves genetic mutations.
B) It increases the genetic diversity of the crops.
C) It guarantees uniformity and consistency in plant traits.
D) It requires pollination.
Correct Answer- C) It guarantees uniformity and consistency in plant traits.
Explanation- Since vegetative propagation produces new plants that are genetically identical to the parent, it ensures consistency in traits, which is important for commercial crops.
How does vegetative propagation contribute to the speed of plant production?
A) By relying on seed dispersal mechanisms
B) By facilitating genetic diversity
C) By enabling rapid multiplication of plants
D) By depending on the natural pollination process
Correct Answer- C) By enabling rapid multiplication of plants
Explanation- Vegetative propagation allows for the quicker production of plants as it does not rely on the slower processes of pollination and seed formation.
Which activity would help in understanding vegetative propagation through cuttings?
A) Planting seeds from a flower
B) Growing a money plant in water
C) Planting a branch with a node in soil
D) Observing the pollination process
Correct Answer- C) Planting a branch with a node in soil
Explanation- Planting a cutting, such as a branch with a node, in soil is a direct way to observe vegetative propagation, as this process will demonstrate how new roots and leaves can emerge from the cutting.
What is the primary role of sugar in the yeast budding experiment?
A) To strengthen the cell walls
B) To serve as a food source for yeast growth
C) To increase the water content
D) To attract more yeast cells
Correct Answer- B) To serve as a food source for yeast growth
Explanation- In the yeast budding experiment, sugar acts as a nutrient or food source for the yeast. Yeast cells consume sugar and convert it into energy through the process of fermentation, which enables them to grow and reproduce through budding.
In yeast, what is the term used to describe the new cell that forms and grows from the body of its parent cell?
A) Spore
B) Fragment
C) Bud
D) Daughter cell
Correct Answer- C) Bud
Explanation- The new cell that forms and grows from the body of a yeast parent cell is called a “bud.” This is part of the asexual reproduction process known as budding, where the bud eventually separates from the parent cell to become a new independent yeast cell.
What is a critical environmental condition for fragmentation in algae?
A) Absence of light
B) Availability of water and nutrients
C) High temperature
D) Dry conditions
Correct Answer- B) Availability of water and nutrients
Explanation- Fragmentation in algae requires favourable environmental conditions, particularly the availability of water and nutrients. These conditions are essential for the broken fragments of the algae to grow and develop into new individuals.
What happens to the nucleus during the budding process in yeast?
A) It remains unchanged
B) It dissolves
C) It splits into two
D) It leaves the parent cell
Correct Answer- C) It splits into two
Explanation- During the budding process in yeast, the nucleus of the parent yeast cell divides into two. One part stays with the parent cell, while the other moves into the budding cell, ensuring that both cells have the genetic material necessary for survival and function.
How does the budding process in yeast start?
A) With the disintegration of the parent cell
B) With the formation of a spore
C) With the initiation of a bud on the yeast cell surface
D) With the absorption of water
Correct Answer- C) With the initiation of a bud on the yeast cell surface
Explanation- The budding process in yeast begins with the formation of a small bump on the surface of the yeast cell. This bump is the initial stage of the new yeast cell, known as a ‘bud,’ which will eventually grow and separate from the parent cell.
In the context of algae, what is the outcome of fragmentation?
A) The formation of a single large organism
B) The production of spores
C) The rapid multiplication of the population
D) The growth of parental traits in offspring
Correct Answer- C) The rapid multiplication of the population
Explanation- Fragmentation in algae leads to the rapid multiplication of the population. As the organism breaks up into multiple fragments, each one has the capability to grow and develop into a new individual, thereby increasing the population swiftly.
What role does the anther play in a flower’s reproductive process?
A) Produces nectar
B) Releases the pollen grains
C) Supports the stigma
D) Attracts pollinators
Correct Answer- B) Releases the pollen grains
Explanation- The anther is responsible for the production and release of pollen grains, which are the male gametes in plants.
What is the function of the filament in the stamen?
A) To produce pollen grains
B) To attract insects
C) To hold the anther in an appropriate position for pollen dispersal
D) To connect the anther and the ovary
Correct Answer- C) To hold the anther in an appropriate position for pollen dispersal
Explanation- The filament is a slender, thread-like part that supports the anther, helping it to effectively release pollen for pollination.
The pistil consists of the stigma, style, and ovary. What is the role of the ovary?
A) To produce pollen
B) To receive pollen grains
C) To house and produce the female gametes
D) To produce nectar
Correct Answer- C) To house and produce the female gametes
Explanation- The ovary is located at the base of the pistil and contains the ovules, where the female gametes (eggs) are produced.
Which part of the pistil is responsible for capturing pollen grains?
A) Style
B) Ovary
C) Stigma
D) Filament
Correct Answer- C) Stigma
Explanation- The stigma is the part of the pistil that acts as a receptive surface for pollen grains.
A unisexual flower contains-
A) No reproductive parts
B) Only male reproductive parts
C) Both male and female reproductive parts
D) Either male or female reproductive parts, but not both
Correct Answer- D) Either male or female reproductive parts, but not both
Explanation- Unisexual flowers are those that have either a stamen or a pistil, making them exclusively male or female.
How does cross-pollination affect a plant population?
A) Decreases genetic diversity
B) Prevents fertilisation
C) Increases genetic diversity
D) Makes plants more susceptible to diseases
Correct Answer- C) Increases genetic diversity
Explanation- Cross-pollination involves the transfer of pollen between different plants of the same species, leading to increased genetic diversity.
Which pollination method does not typically require an external agent like insects, wind, or water?
A) Cross-pollination
B) Self-pollination
C) Agent-based pollination
D) Indirect pollination
Correct Answer- B) Self-pollination
Explanation- Self-pollination occurs within the same flower or between flowers of the same plant, often without the need for external pollinators.
What is the primary ecological role of insects in the pollination process?
A) To consume the flower
B) To provide nutrients to the soil
C) To transfer pollen grains between flowers
D) To damage the reproductive organs
Correct Answer- C) To transfer pollen grains between flowers
Explanation- Insects like bees and butterflies transfer pollen grains as they move from flower to flower, playing a crucial role in pollination.
What do we call plants that have flowers with both stamens and pistils?
A) Sterile plants
B) Unisexual plants
C) Monoecious plants
D) Bisexual plants
Correct Answer- D) Bisexual plants
Explanation- Bisexual plants bear flowers that contain both male and female reproductive organs – stamens and pistils.
Successful pollination is a prerequisite for-
A) Leaf development
B) Root growth
C) Fruit and seed formation
D) Stem elongation
Correct Answer- C) Fruit and seed formation
Explanation- Pollination must occur for a flower to produce fruits and seeds, which are necessary for the continuation of the plant species.
In which part of the flower does fertilisation take place?
A) Stamen
B) Stigma
C) Ovary
D) Petal
Correct Answer- C) Ovary
Explanation- Fertilisation occurs in the ovary where the male gamete (from the pollen) fuses with the female gamete (egg) to form a zygote.
The adaptation of having feathery or large stigmas is most likely seen in plants pollinated by-
A) Insects
B) Water
C) Wind
D) Birds
Correct Answer- C) Wind
Explanation– Plants pollinated by the wind have adaptations such as feathery or large stigmas to catch the pollen grains as they are carried by air currents.
Fertilisation in plants is best described as-
A) The growth of the pollen tube.
B) The dispersal of seeds.
C) The union of male and female gametes.
D) The development of fruits from the ovary.
Correct Answer- C) The union of male and female gametes.
Explanation- Fertilisation is defined as the union of the male gamete (found in pollen) with the female gamete (egg cell in the ovule).
The ovule is located in which part of the flower?
A) Stigma
B) Style
C) Ovary
D) Anther
Correct Answer- C) Ovary
Explanation- The ovule, which contains the female gamete, is found within the ovary.
What is the result of the fusion of male and female gametes in plants?
A) Pollen tube
B) Zygote
C) Stamen
D) Pistil
Correct Answer- B) Zygote
Explanation- The zygote is formed from the union of male and female gametes during fertilisation.
Which part of the plant’s reproductive process does pollination relate to?
A) The growth of the fruit
B) The dispersal of seeds
C) The transfer of pollen grains to the stigma
D) The development of the pollen tube
Correct Answer- C) The transfer of pollen grains to the stigma
Explanation- Pollination refers to the transfer of pollen from an anther to the stigma.
The germination of pollen grains primarily leads to the formation of-
A) Seeds
B) Fruits
C) A pollen tube
D) An ovule
Correct Answer- C) A pollen tube
Explanation- Upon landing on a compatible stigma, a pollen grain germinates and forms a pollen tube, which allows the male gamete to travel to the ovule.
What does the zygote develop into after several cell divisions?
A) A pollen grain
B) An embryo
C) A fruit
D) A seed coat
Correct Answer- B) An embryo
Explanation- The zygote undergoes multiple cell divisions to become an embryo, which is the early stage of development of a new plant.
Fruits serve as a protective enclosure for which part of a plant?
A) Leaves
B) Seeds
C) Roots
D) Flowers
Correct Answer- B) Seeds
Explanation- The primary function of the fruit is to house and protect the seeds.
The process of seed formation initiates with-
A) Pollination
B) Fertilisation
C) Dispersal
D) Germination
Correct Answer- B) Fertilisation
Explanation- Seed formation begins after fertilisation, when the zygote is formed.
Which component of a seed is responsible for protecting the embryo?
A) Seed coat
B) Seed hair
C) Seed pore
D) Seed flesh
Correct Answer- A) Seed coat
Explanation- The embryo within a seed is protected by the seed coat.
How do wind-dispersed seeds typically differ from those dispersed by water?
A) They are heavier.
B) They are winged or lightweight.
C) They have a spongy coat.
D) They are embedded in fleshy fruits.
Correct Answer- B) They are winged or lightweight.
Explanation- Seeds adapted for wind dispersal are typically winged or designed to be light enough to be carried by the breeze.
Which of the following is an example of a plant that disperses its seeds through explosive action?
A) Coconut
B) Maple
C) Balsam
D) Grass
Correct Answer- C) Balsam
Explanation- Balsam is known for its explosive mechanism of seed dispersal.
Seed dispersal is crucial for plants because-
A) It promotes genetic diversity and allows colonisation of new areas.
B) It encourages the growth of pollen tubes.
C) It leads to the immediate germination of seeds.
D) It prevents the formation of fruits.
Correct Answer- A) It promotes genetic diversity and allows colonisation of new areas.
Explanation- Seed dispersal is essential as it minimises competition for resources and enables plants to spread and maintain genetic diversity across different habitats.
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