Botany is the branch of Biology that focuses on the study of plants , their structure, functions, growth, reproduction, and role in the environment. This category is curated for school students (Classes 6–12) and undergraduate learners to build strong fundamentals with exam-focused clarity.
In this section, you’ll explore:
Plant morphology, anatomy, and physiology explained step-by-step
Reproduction in plants , development, and life cycles
Cell biology, genetics, and biotechnology concepts related to plants
Ecology and plant diversity with real-world relevance
Important questions, MCQs, diagrams, and revision notes for exams
The content is aligned with NCERT , school boards, and UG syllabi , making it highly useful for school exams, NEET preparation, and college assessments . Concepts are explained in simple language with a focus on understanding, not rote learning.
Build a strong foundation in plant sciences and master Botany with confidence.
Q. At what temperature range do most plants grow best?
A.
0-10°C
B.
10-20°C
C.
20-30°C
D.
30-40°C
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Solution
Most plants grow best in the temperature range of 20-30°C.
Correct Answer:
C
— 20-30°C
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Q. During which part of the day do plants primarily perform respiration?
A.
Daytime only
B.
Nighttime only
C.
Both day and night
D.
Only during photosynthesis
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Solution
Plants perform respiration both day and night, although photosynthesis occurs primarily during the day.
Correct Answer:
C
— Both day and night
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Q. During which phase of photosynthesis is carbon dioxide incorporated into organic molecules?
A.
Light reactions
B.
Calvin cycle
C.
Photorespiration
D.
Electron transport chain
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Solution
Carbon dioxide is incorporated into organic molecules during the Calvin cycle.
Correct Answer:
B
— Calvin cycle
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Q. During which phase of photosynthesis is carbon dioxide utilized?
A.
Light reactions
B.
Calvin cycle
C.
Photorespiration
D.
Electron transport chain
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Solution
Carbon dioxide is utilized during the Calvin cycle.
Correct Answer:
B
— Calvin cycle
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Q. How do plants adapt their photosynthesis process in low light conditions?
A.
Increase chlorophyll production
B.
Decrease water usage
C.
Reduce carbon fixation
D.
Increase respiration rate
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Solution
Plants may increase chlorophyll production to enhance light absorption in low light conditions.
Correct Answer:
A
— Increase chlorophyll production
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Q. How do plants adapt to low light conditions in terms of photosynthesis?
A.
Increasing chlorophyll concentration
B.
Decreasing leaf area
C.
Reducing water uptake
D.
Increasing respiration rate
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Solution
Plants adapt to low light conditions by increasing chlorophyll concentration to capture more light.
Correct Answer:
A
— Increasing chlorophyll concentration
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Q. How do plants utilize the products of the light reactions?
A.
For cellular respiration only
B.
To synthesize proteins
C.
To fuel the dark reactions
D.
To produce more chlorophyll
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Solution
Plants use ATP and NADPH produced in the light reactions to fuel the dark reactions (Calvin cycle).
Correct Answer:
C
— To fuel the dark reactions
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Q. How does increased carbon dioxide concentration affect photosynthesis?
A.
Decreases rate
B.
Increases rate
C.
No effect
D.
Inhibits light reactions
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Solution
Increased carbon dioxide concentration generally increases the rate of photosynthesis up to a point.
Correct Answer:
B
— Increases rate
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Q. How does plant classification aid in ecological research?
A.
By simplifying plant interactions
B.
By providing a framework for understanding biodiversity
C.
By eliminating the need for field studies
D.
By focusing only on agricultural plants
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Solution
Plant classification provides a framework for understanding biodiversity and ecological interactions.
Correct Answer:
B
— By providing a framework for understanding biodiversity
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Q. How does the availability of light affect the rate of photosynthesis?
A.
It has no effect
B.
Increases the rate until a saturation point
C.
Decreases the rate
D.
Only affects the dark reactions
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Solution
The rate of photosynthesis increases with light availability until it reaches a saturation point.
Correct Answer:
B
— Increases the rate until a saturation point
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Q. How does the concentration of carbon dioxide affect the rate of photosynthesis?
A.
Increases rate
B.
Decreases rate
C.
No effect
D.
Only affects light reactions
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Solution
Increasing the concentration of carbon dioxide generally increases the rate of photosynthesis up to a certain point.
Correct Answer:
A
— Increases rate
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Q. How does the concentration of CO2 affect the rate of photosynthesis?
A.
Increases it indefinitely
B.
Has no effect
C.
Increases it to a point, then levels off
D.
Decreases it
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Solution
The rate of photosynthesis increases with CO2 concentration to a point, after which it levels off due to other limiting factors.
Correct Answer:
C
— Increases it to a point, then levels off
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Q. How many chromosomes do most diploid plants have?
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Solution
Most diploid plants have 20 chromosomes, as they typically have two sets of 10.
Correct Answer:
B
— 20
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Q. How many classes are there in the division Angiospermae?
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Solution
There are 2 main classes in the division Angiospermae: Monocotyledons and Dicotyledons.
Correct Answer:
B
— 2
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Q. How many hours of light do most plants require for optimal photosynthesis per day?
A.
6 hours
B.
12 hours
C.
18 hours
D.
24 hours
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Solution
Most plants require around 12 hours of light for optimal photosynthesis.
Correct Answer:
B
— 12 hours
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Q. How many layers of cells typically make up the epidermis in dicotyledonous plants?
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Solution
The epidermis in dicotyledonous plants typically consists of a single layer of cells.
Correct Answer:
A
— 1
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Q. How many major divisions are there in the plant kingdom?
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Solution
There are 4 major divisions in the plant kingdom: Bryophyta, Pteridophyta, Gymnospermae, and Angiospermae.
Correct Answer:
B
— 4
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Q. How many molecules of ATP are produced in the light-dependent reactions for each molecule of glucose synthesized?
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Solution
A total of 18 ATP molecules are produced for each glucose molecule synthesized.
Correct Answer:
A
— 18
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Q. How many molecules of ATP are produced in the light-dependent reactions for every molecule of glucose synthesized?
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Solution
A total of 36 ATP molecules are produced in the light-dependent reactions for every glucose molecule synthesized.
Correct Answer:
C
— 36
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Q. How many molecules of carbon dioxide are required to produce one molecule of glucose in the Calvin cycle?
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Solution
Six molecules of carbon dioxide are required to produce one molecule of glucose in the Calvin cycle.
Correct Answer:
D
— 6
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Q. How many petals does a typical flower of the family Asteraceae have?
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Solution
A typical flower in the Asteraceae family has 10 petals.
Correct Answer:
B
— 10
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Q. How many seeds does a typical sunflower head produce?
A.
100
B.
500
C.
1000
D.
2000
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Solution
A typical sunflower head can produce around 1000 seeds.
Correct Answer:
C
— 1000
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Q. How many species are estimated to exist within the plant kingdom?
A.
250,000
B.
400,000
C.
1 million
D.
2 million
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Solution
It is estimated that there are around 400,000 species within the plant kingdom.
Correct Answer:
B
— 400,000
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Q. How many stages are there in the typical life cycle of a flowering plant?
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Solution
The typical life cycle of a flowering plant includes 4 stages: germination, growth, reproduction, and death.
Correct Answer:
C
— 4
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Q. How many types of phloem cells are there?
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Solution
There are two main types of phloem cells: sieve elements and companion cells.
Correct Answer:
B
— 2
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Q. How many types of plant hormones are primarily involved in growth regulation?
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Solution
There are 4 primary types of plant hormones involved in growth regulation: auxins, gibberellins, cytokinins, and abscisic acid.
Correct Answer:
B
— 4
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Q. How many types of primary meristematic tissues are there in plants?
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Solution
There are three types of primary meristematic tissues: protoderm, ground meristem, and procambium.
Correct Answer:
C
— 3
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Q. How many types of sclerenchyma cells are there?
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Solution
There are two main types of sclerenchyma cells: fibers and sclereids.
Correct Answer:
B
— 2
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Q. How many types of xylem cells are there?
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Solution
There are two main types of xylem cells: tracheids and vessel elements.
Correct Answer:
B
— 2
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Q. If a plant has a generation time of 2 years, how many generations will it complete in 10 years?
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Solution
In 10 years, the plant will complete 5 generations (10 years / 2 years per generation).
Correct Answer:
B
— 5
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