MCQ Bank

Animals contribute to plant biodiversity by transferring pollen between plants and dispersing seeds to new locations. These activities support plant reproduction and genetic variation.

BT201 Final Term AI Solved

Q111

The only living species of Ginkgophyta is:

A) Cedrus deodara
B) Ginkgo biloba
C) Sequoia gigantea
D) Juniperus communis

AI Explanation

Ginkgo biloba is the only living species of the phylum Ginkgophyta. It is considered a living fossil because its lineage has existed for millions of years.

BT201 Final Term AI Solved

Q112

Modern drugs from plants are mostly derived from:

A) Animal tissues
B) Secondary metabolites
C) Primary metabolites
D) Soil bacteria

AI Explanation

Many modern plant-derived drugs come from secondary metabolites, which include compounds with medicinal properties. These compounds often function in plant defense and interactions.

BT201 Final Term AI Solved

Q113

Dicots dominate woody plant diversity because:

A) Their vascular tissues support secondary growth and woody structures.
B) They have parallel venation.
C) They have scattered vascular bundles.
D) They are always herbaceous.

AI Explanation

Dicots commonly develop secondary growth through vascular cambium activity, allowing them to form wood and become large woody plants. This contributes to their dominance in woody plant diversity.

BT201 Final Term AI Solved

Q114

Which method would BEST help conserve genetic diversity in crop plants?

A) Encouraging only self-pollinated crops
B) Eliminating all pollinating agents
C) Promoting cross-pollination and use of pollinator insects
D) Pollinating only through wind

AI Explanation

Cross-pollination increases genetic variation in crop plants, improving adaptability and resilience. Pollinator insects help maintain effective reproduction and genetic diversity.

BT201 Final Term AI Solved

Q115

Why is the sporophyte phase dominant in angiosperms?

A) It occurs after fertilization only.
B) It depends on gametophytes for food.
C) It is only present during seed germination.
D) It is larger, photosynthetic, and produces reproductive structures.

AI Explanation

In angiosperms, the sporophyte is the dominant generation because it forms the main plant body. It performs photosynthesis and produces reproductive structures that generate gametophytes.

BT201 Final Term AI Solved

Q116

What is the evolutionary advantage of cross-pollination over self-pollination?

A) Greater genetic diversity and better adaptability
B) Faster seed production
C) Larger flower size
D) Reduced dependency on pollinators

AI Explanation

Cross-pollination combines genetic material from different plants, increasing genetic variation. This diversity improves the ability of populations to adapt to environmental changes.

BT201 Final Term AI Solved

Q117

Which of the following is a secondary metabolite produced by plants?

A) Cellulose
B) Enzymes
C) Alkaloids
D) Starch

AI Explanation

Alkaloids are secondary metabolites produced by plants and often have defensive or medicinal properties. Cellulose, enzymes, and starch are primarily involved in structural or primary metabolic functions.

BT201 Final Term AI Solved

Q118

The aquatic ancestry of angiosperms is supported by:

A) Lack of flowers
B) Open seeds
C) Presence of cones
D) Fossil evidence of early aquatic plants

AI Explanation

Fossil evidence provides clues about the evolutionary history and possible aquatic origins of early angiosperms. It helps scientists understand how flowering plants evolved.

BT201 Final Term AI Solved

Q119

The largest phylum of gymnosperms is:

A) Gnetophyta
B) Coniferophyta
C) Ginkgophyta
D) Cycadophyta

AI Explanation

Coniferophyta is the largest phylum of gymnosperms and includes familiar plants such as pines, firs, and spruces. They are widely distributed and ecologically important.

BT201 Final Term AI Solved

Q120

Why is preserving plant diversity essential for humans and animals?

A) To maintain ecosystem balance and ensure food and medicine supply
B) To reduce the need for forests
C) To increase the number of invasive species
D) To speed up climate change

AI Explanation

Preserving plant diversity supports ecosystem stability and provides essential resources such as food, medicines, and materials. Diverse plant communities also help maintain ecological processes.

BT201 Final Term AI Solved

Q121

Which sequence best represents angiosperm evolution?

A) Ferns → Gymnosperms → Angiosperms
B) Aquatic plants → Closed carpel flowers → Fleshy fruits → Dominance on land
C) Land plants → Cones → Naked seeds → Flowers
D) Spores → Cones → Fruits

AI Explanation

Angiosperm evolution involved adaptations such as enclosed ovules in carpels, fruit formation, and improved reproductive strategies. These features helped flowering plants become dominant on land.

BT201 Final Term AI Solved

Q122

Which factor best explains why angiosperms dominate most ecosystems?

A) Presence of cones for seed protection
B) Slower seed development than gymnosperms
C) Faster fertilization and seed production
D) Lack of flowers

AI Explanation

Angiosperms dominate many ecosystems because they have efficient reproduction, rapid fertilization, and effective seed dispersal through fruits. These adaptations increase their survival and spread.

BT201 Final Term AI Solved

Q123

Which adaptation helps prevent self-pollination?

A) Closed flowers with sticky stigma
B) Bright petals and nectar to attract insects
C) Absence of pollinators
D) Same height of anther and stigma

AI Explanation

Bright flowers and nectar attract animal pollinators, promoting pollen transfer between different plants rather than self-pollination. This increases genetic diversity.

BT201 Final Term AI Solved

Q124

Why are plant spores resistant to harsh environments?

A) Because they have stomata
B) Due to the presence of sporopollenin in their walls
C) Because they are multicellular
D) Because they are fertilized

AI Explanation

Sporopollenin is a highly resistant substance found in spore walls that protects spores from drying and environmental stress. It allows spores to survive harsh conditions.

BT201 Final Term AI Solved

Q125

Select the correct sequence to classify an unknown flowering plant:

A) Only count flower parts
B) Check height → Count leaves → Check bark → Check seed size
C) Count cotyledons → Check venation → Observe flower parts → Check vascular bundle arrangement
D) Observe flowers → Check seeds → Check roots → Count cotyledons

AI Explanation

Flowering plants are commonly classified by examining key traits such as the number of cotyledons, leaf venation, floral structures, and vascular bundle arrangement. These features help distinguish major groups like monocots and dicots.

BT201 Final Term AI Solved

Q126

Which of the following is NOT a function of plant biodiversity?

A) Oxygen production
B) Increasing air pollution
C) Providing shelter to animals
D) Soil erosion prevention

AI Explanation

Plant biodiversity helps produce oxygen, provide habitats, and reduce soil erosion. Increasing air pollution is harmful to ecosystems and is not a function of plant biodiversity.

BT201 Final Term AI Solved

Q127

What is the role of mycorrhizae in land plant adaptation?

A) Increase root surface area for water/nutrient absorption
B) Decrease transpiration
C) Prevent predation
D) Reproduction

AI Explanation

Mycorrhizae are mutualistic associations between fungi and plant roots. They extend the effective root system, improving absorption of water and minerals from soil.

BT201 Final Term AI Solved

Q128

Which of the following features helps monocots adapt to herbaceous life?

A) Woody tissues
B) Thick secondary xylem
C) Scattered vascular bundles
D) Reticulate venation

AI Explanation

Monocots typically have scattered vascular bundles, which support their herbaceous growth form. They generally lack extensive secondary growth and woody tissues.

BT201 Final Term AI Solved

Q129

Why do pollinators depend on flowers?

A) To avoid predators
B) For nectar and pollen as food sources
C) For shelter only
D) For dispersal by wind

AI Explanation

Pollinators visit flowers to obtain resources such as nectar and pollen. In return, they help plants by transferring pollen and enabling reproduction.