MCQ Bank

Gymnosperms are seed-producing plants that have naked seeds, meaning the seeds are not enclosed within a fruit. Examples include pine and cycad plants.

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Q71

Why are seeds considered a key adaptation for terrestrial life?

A) Because they are small
B) They produce flowers
C) They don’t need roots
D) They protect embryos and allow survival in harsh environments

AI Explanation

Seeds protect developing embryos and contain stored nutrients that support early growth. They allow plants to survive unfavorable environmental conditions and disperse to new locations.

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Q72

What ecological role does peat moss play in succession?

A) It attracts bees
B) It absorbs water and converts muddy banks into solid soil
C) It provides oxygen to lakes
D) It eats bacteria

AI Explanation

Peat moss (Sphagnum) plays an important ecological role by absorbing and retaining water. It contributes to soil formation and succession by stabilizing wet environments.

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Q73

The protective structure at the tip of the root is:

A) Root node
B) Root cap
C) Apical meristem
D) Root hairs

AI Explanation

The root cap is the protective structure at the tip of the root. It protects the delicate growing tissues as the root pushes through soil.

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Q74

What is the function of lignin in xylem walls?

A) It stores food
B) It provides rigidity and prevents water loss
C) It breaks down minerals
D) It facilitates gas exchange

AI Explanation

Lignin strengthens xylem cell walls and provides structural support to plants. It also helps prevent collapse of water-conducting vessels and reduces water loss.

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Q75

Phloem mainly transports:

A) Water
B) Food and minerals
C) Chlorophyll
D) Carbon dioxide

AI Explanation

Phloem transports organic nutrients, especially sugars produced during photosynthesis, from leaves to other parts of the plant. It does not primarily transport water, which is the function of xylem.

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Q76

. The word "gymnosperm" literally means:

A) Flowering seed
B) Naked seed
C) Covered seed
D) Fertile seed

AI Explanation

The term gymnosperm comes from Greek words meaning 'naked seed'. Gymnosperm seeds are exposed rather than enclosed within an ovary or fruit.

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Q77

Which generation is dominant in higher plants?

A) None of the above
B) Sporophyte
C) Gametophyte
D) Zygote

AI Explanation

In higher plants, the sporophyte generation is dominant and represents the main visible plant body. The gametophyte is reduced and dependent on the sporophyte in many groups.

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Q78

Gymnosperm seeds are called “naked” because they:

A) Are dispersed by water
B) Are not enclosed in ovaries
C) Lack stored food
D) Grow only on leave

AI Explanation

Gymnosperm seeds are called naked because they develop exposed on the surface of reproductive structures rather than being enclosed inside an ovary. This distinguishes them from angiosperms.

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Q79

How does sperm reach the egg in mosses?

A) Swimming through water
B) Direct contact
C) Wind pollination
D) By insects

AI Explanation

Moss sperm are flagellated and require water to swim from the male reproductive structure to the egg. This dependence on water is a characteristic feature of bryophyte reproduction.

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Q80

Why are seeds considered evolutionarily superior to spores?

A) Seeds cannot disperse
B) Seeds store nutrients and can remain dormant
C) Seeds need constant water supply
D) Spores are larger than seeds

AI Explanation

Seeds are evolutionarily advantageous because they protect the embryo, contain stored nutrients, and can remain dormant during unfavorable conditions. Spores generally lack these protective and nutritional advantages.

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Q81

Which vascular tissue transports water from roots to other parts?

A) Xylem
B) Cambium
C) Phloem
D) Epidermis

AI Explanation

Xylem is the vascular tissue responsible for transporting water and minerals from roots to the rest of the plant. It consists mainly of specialized cells adapted for water conduction.

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Q82

Why do bryophytes reduce the impact of rain on soil?

A) Because they repel water
B) Because they absorb the impact and water
C) Because they grow underground
D) Because they are tall plants

AI Explanation

Bryophytes form mats that absorb rainfall and retain moisture, reducing the force of water hitting the soil. This helps prevent soil erosion.

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Q83

What is the primary feature of roots that ensures water absorption?

A) Cuticle
B) Leaf veins
C) Root cap
D) Root hairs

AI Explanation

Root hairs increase the surface area of roots and are the main structures responsible for efficient water and mineral absorption from the soil. They provide close contact with soil particles.

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Q84

What is the scientific study of pollen called?

A) Botany
B) Palynology
C) Dendrology
D) Mycology

AI Explanation

Palynology is the scientific study of pollen, spores, and other microscopic organic particles. It is used in fields such as botany, ecology, and geology.

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Q85

What feature allows megaphylls to adapt to reduced CO₂ levels?

A) Vascular cambium
B) Decreased chloroplasts
C) Lack of veins
D) Presence of stomata and increased surface area

AI Explanation

Megaphylls are large leaves with extensive surface area and stomata that improve gas exchange. These features help plants adapt to changes in carbon dioxide availability by increasing photosynthetic efficiency.

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Q86

Which plant is used in Europe as a renewable fuel source?

A) Club Moss
B) Fern
C) Rhododendron
D) Sphagnum

AI Explanation

Sphagnum moss is used as a renewable fuel source in parts of Europe because accumulated peat from Sphagnum can be burned as fuel. It also plays important ecological roles in wetland ecosystems.

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Q87

What does the word Bryophyte mean in Greek origin?

A) Moss plants
B) Water plants
C) Tiny herbs
D) Green plants

AI Explanation

The word Bryophyte comes from Greek roots meaning moss plants. Bryophytes include mosses, liverworts, and hornworts.

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Q88

Which structure allows plants to absorb water and nutrients from soil?

A) Stems
B) Phloem
C) Roots
D) Leaves

AI Explanation

Roots anchor plants and absorb water and nutrients from the soil. They contain specialized structures such as root hairs that increase absorption efficiency.

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Q89

What are the main photosynthetic pigments shared by green algae and plants?

A) Chlorophyll b and hemoglobin
B) Chlorophyll c and d
C) Xanthophyll only
D) Chlorophyll a, chlorophyll b, carotenoids

AI Explanation

Green algae and plants share the main photosynthetic pigments chlorophyll a, chlorophyll b, and carotenoids. These pigments capture light energy for photosynthesis.