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CBSE Questions for Class 7 Biology Reproduction In Plants Quiz 1 - MCQExams.com
CBSE
Class 7 Biology
Reproduction In Plants
Quiz 1
Which of the following fruits are
fleshy
and juicy?
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Apple
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Orange
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Mango
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All of the above
Explanation
The fruit is the ripened ovary. The seeds develop from the ovules. The seed contains an embryo enclosed in a protective seed coat. Some fruits are fleshy and juicy such as mango, apple and orange.
Option D is correct.
The vegetative reproduction in
Bryophyllum
takes place through which part of the plant?
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Root
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Stem
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Leaf
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Seed
Explanation
Vegetative reproduction is a type of asexual reproduction in which new plants are formed from the vegetative parts like leaf, root, stem, etc. Vegetative reproduction in
Bryophyllum
takes place through leaves.
The leaf buds are produced on the edge of the
Bryophyllum
leaf. The buds fall from the leaf on the soil. These buds can
develop into individual plants when favourable conditions are provided.
Thus, the correct answer is option C.
Pollination is the process of transfer of flowers from the anther to the stigma of the same or another plant.
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True
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False
Explanation
Pollination is the process of
transfer of pollen grains
from the anther of one flower to the stigma of the same or another flower of the same species.
Thus, the given statement is False.
Vegetative propagation refers to the formation of new plants from
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Stem, roots and flowers
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Stem, roots and leaves
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Stem, flowers and fruits
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Stem, leaves and flowers
Explanation
Vegetative propagation occurs through vegetative parts like root, stem, leaves. Flowers are meant for sexual reproduction in plants.
Thus, option "B" is correct.
Bryophyllum
plant is vegetatively propagated by
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Underground stem tuiber
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Leaf buds
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Underground root tuber
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Stolon and rhizome
Explanation
Vegetative reproduction is a type of asexual reproduction in which new plants are formed from the vegetative parts like, tubers, runners, suckers, rhizomes etc. Adventitious leaf buds are produced on the notches of
Bryophyllum
leaf. These adventitious buds can be used for vegetative propagation. The buds can develop into individual plants when favourable conditions are provided.
Thus, the correct answer is option B.
In potatoes, new plants grow from
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Leaves
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Buds on the leaflets
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Roots
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Eyes
Explanation
In potatoes, new plants grow from eyes or small scars present on the surface. Likewise other plants such as ginger and turmeric can also grow from eyes.
Option "D" is correct.
The development of an offspring from any part of the body is called:
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Asexual reproduction
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Sexual reproduction
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Vegetative reproduction
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All of the above
Explanation
Vegetative reproduction is a type of asexual reproduction mainly observed in plants.
Since the vegetative part of the plant propagates to produce offspring hence it is also called vegetative propagation.
The new plant is genetically identical to the parent plant.
Thus, the correct answer is option C.
The plant/s in which vegetative propagation is found naturally is/are:
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Bryophyllum
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Sugarcane
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Rose
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All of the above
Explanation
In
Bryophyllum
vegetative propagation occurs through buds formed in the leaf margins.
However, Sugarcane and Rose are propagated through stem cuttings (artificial method of vegetative propagation).
So, the correct answer is '
Bryophyllum'
Flowers which have both stamens and pistils are called:
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Incomplete flowers
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Bisexual flowers
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Unisexual flowers
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Co-existent flowers
Explanation
A flower that lacks one or two of the 4 parts is called an incomplete flower.
A bisexual flower has both stamen and pistil in the same flower.
A unisexual flower has one of the reproductive organs, i.e. either stamen or pistil.
So the correct option is option B.
What are spores?
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Tiny cells protected by thick walls to survive unfavorable conditions.
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Buds formed in long chains.
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Outgrowths from parent organism.
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New organisms growing from leaflets.
Explanation
The spores are asexual reproductive bodies.
Each tiny spore is covered by a hard protective coat to withstand unfavourable conditions such as high temperature and low humidity. So they can survive for a long time.
Under favourable conditions, a spore germinates and develops into a new individual. Plants such as mosses and ferns also reproduce by means of spores.
Thus, Option "A" is correct.
Name the reproductive organ of plants.
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Flower
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Leaves
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Stem
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Roots
In which of the following organisms fragmentation occurs?
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Bacteria
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Yeast
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Spirogyra
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All of the above
Explanation
Fragmentation is a process of asexual reproduction in which the parent organism breaks up into two or more pieces/fragments, and each piece/fragment gives rise to a new individual.
Spirogyra
undergoes fragmentation.
Bacteria undergo fission, and
Yeast undergoes budding.
So, the correct option is
C.
Which of the following perform reproduction in plants?
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Roots
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Stem
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Flower
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All of the above
Explanation
Flowers perform the function of reproduction in plants and are the reproductive parts of a plant. For example, rose, papaya.
On the other hand, roots, stems, leaves, and buds are the vegetative parts of the plant but are also involved in reproduction known as vegetative propagation. For example-
Bryophyllum
, potato.
Plants like potatoes (
Solanum tuberosum
) reproduce by producing tubers. Tubers are modified stems that store starch. Tubers arise as swollen ends of stolons and contain many adventitious buds (eyes on potatoes). Each eye can grow to form an individual plant.
So the correct option is "All of the above".
Which of the following plants reproduces by roots?
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Sweet potato
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Turmeric
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Ginger
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None of the above
Explanation
Option 'A' is correct
Reproducetion by root is a type
of vegetation reproduction. In
this process, both the adventitious
and tap roots taks part due to
the presence of bud which is
known as radical bud. The
adventitious buds dutaches from
root is guienc rise to a neue plant
Example - sweet potato.
The production of a new individual from the parent is called
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Reproduction
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Propagation
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Cloning
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None of the above
Explanation
Asexual reproduction is a type of reproduction that does not involve the fusion of gametes or change in the number of chromosomes. The offspring that arise by asexual reproduction, either from a single cell or from a multicellular organism, inherit the genes of their single parent.
When two parents are involved in reproduction, the method is called sexual reproduction. The male and female gametes fuse during fertilization to produce the zygote. The zygote subsequently develops into an embryo which further develops into a new individual.
In either case, the new individual arises from the parent.
So the correct option is "Reproduction".
The process in which organisms break into pieces is called
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Budding
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Fragmentation
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Spore formation
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All of the above
Explanation
Fragmentation is the process in which the body of an organism breaks up into two or more pieces, which on maturing grows to form a completely new organism.
Ex- Spirogyra, algae.
So the correct option is "B- Fragmentation".
In which of the following modes of reproduction new plants are produced without seeds?
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Asexual reproduction
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Sexual reproduction
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Vegetative propagation
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Both A and C
Explanation
Asexual reproduction produces plants that are genetically identical to the parent plant because no mixing of male and female gametes takes place
Vegetative reproduction is a type of asexual reproduction without the production of seeds or spores. Many types of roots exhibit vegetative reproduction.
While in sexual reproduction produces offspring by the fusion of gametes, resulting in offspring genetically different from the parent or parents. The zygote formed due to the fusion of gametes will develop to form an embryo that is protected in hard protective coverings of seed.
Hence, option D is correct.
The ovary of a flower contains small structures called:
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Male gamete
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Ovules
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Pollens
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Both B and C
Explanation
The ovules are
small structures present in the ovary. The ovule contains the female gamete.
Pollen contains male gametes and is formed inside the anther.
So, the correct option is B.
In which of the following processes water is involved in the reproduction?
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Budding
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Spore formation
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Fragmentation
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All of the above
Explanation
When water and nutrients are available algae grow and multiply rapidly by fragmentation.
An alga breaks up into two or more fragments. These fragments or pieces grow into new individuals.
This process continues and they cover a large area in a short period of time.
Option "C" is correct.
___________ is a life process that is not essential for an individual's survival but for survival of the species.
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Growth
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Reproduction
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Respiration
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Nutrition
Explanation
Reproduction is a biological process in which an organism produces young ones (offspring) of the same kind.
It is one of the most important characteristics of living organisms.
An
individual
has a limited lifespan
and
lives for a defined time period
but
species survive and
evolve for a much longer duration.
This process does not serve any other purpose than to multiply organisms, and it is not required for the energy production or growth of organisms.
Thus an
individual can survive without reproduction but a species may extinct.
So, the correct answer is option 'B'.
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