Sexual Reproduction in Flowering Plants Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

For wind-pollinated flowers, which environmental factor is most critical for effective pollen dispersal?

Humidity
Wind speed
Soil moisture
Ambient light
2

Wind speed is crucial in wind-pollinated (anemophilous) plants to carry pollen grains over distances for successful pollination.

Which statement best summarizes the process of double fertilization in angiosperms?

Two sperm cells fuse with two egg cells to form twin zygotes
One sperm fuses with the egg forming a zygote, while the other fuses with two polar nuclei to form the endosperm
Both sperm cells fuse with the egg cell simultaneously
Fertilization occurs without the involvement of polar nuclei
2

Double fertilization involves one sperm cell fusing with the egg to form the zygote and the other fusing with the two polar nuclei to produce the triploid endosperm.

Which of the following statements about the role of calcium ions in pollen tube elongation is correct?

Calcium ions are essential for regulating the growth and directional guidance of the pollen tube.
Calcium ions inhibit the growth of the pollen tube.
Calcium ions are only involved in seed germination.
Calcium ions are not found in the pollen tube.
1

Calcium ions play a crucial role in pollen tube elongation by regulating cytoskeletal dynamics and signaling pathways that direct the tube's growth toward the ovule.

Which factor is most likely to enhance cross-pollination in flowering plants?

Structural adaptation that prevents self-pollination
Production of clonal, genetically identical seeds
The absence of pollinator attraction mechanisms
High levels of self-compatibility
1

Structural and biochemical adaptations that prevent self-pollination promote cross-pollination, thereby increasing genetic diversity.

Double fertilization in angiosperms results in the formation of:

Two zygotes
A diploid zygote and a triploid endosperm
Two embryos
An embryo and a seed coat
2

Double fertilization involves one sperm fusing with the egg to form a diploid zygote, and another sperm fusing with the two polar nuclei to form a triploid endosperm, which nourishes the developing embryo.

Which of the following statements about seed development in monocots and dicots is correct?

In monocots, the endosperm is typically persistent in the mature seed, whereas in dicots it is usually absorbed by the developing embryo.
In dicots, the endosperm is persistent, while in monocots it is absorbed by the embryo.
Both monocots and dicots always retain a large endosperm in the mature seed.
Neither monocots nor dicots develop an endosperm during seed development.
1

Typically, monocot seeds (e.g., cereals) retain a substantial endosperm, whereas in dicots the endosperm is often consumed by the embryo during development.

What is the primary role of nectar in many flowering plants?

To serve as the male gametophyte
To attract pollinators by providing a sugar-rich reward
To initiate seed germination
To develop into the fruit
2

Nectar is produced by many flowers to attract pollinators such as insects and birds, which in turn assist in pollination.

Which of the following is a false statement regarding self-compatibility in flowering plants?

Self-compatibility allows a flower to fertilize itself.
It promotes genetic diversity by encouraging cross-pollination.
Self-compatibility can lead to inbreeding depression.
Self-compatible plants can produce offspring without the need for cross-pollination.
2

Self-compatibility means that a plant can self-fertilize. While it offers reproductive assurance, it does not promote genetic diversity; in fact, cross-pollination is needed for increased variability.

Which process is the primary source of genetic variation in flowering plants?

Mitosis
Clonal propagation
Meiosis
Budding
3

Meiosis during gametogenesis introduces genetic variation through recombination and independent assortment of chromosomes.

Which type of pollination involves transfer of pollen by wind?

Zoophily
Entomophily
Anemophily
Hydrophily
3

Anemophily is pollination by wind, typical in many grasses and some trees.

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