Sexual Reproduction in Flowering Plants Chapter-Wise Test 13

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements regarding environmental stress and flowering induction is correct?

Environmental stress, such as drought or extreme temperature, can sometimes trigger flowering as a survival strategy.
Environmental stress always inhibits flowering and prevents reproduction.
Flowering induction is entirely independent of environmental factors.
Only nutrient-rich conditions can induce flowering in plants.
1

In some cases, environmental stress can act as a trigger for flowering, allowing plants to reproduce before conditions worsen.

Which of the following statements about endosperm development is incorrect?

The endosperm provides nutrition to the developing embryo.
The endosperm is typically triploid, formed by the fusion of one sperm with two polar nuclei.
The endosperm always persists in the mature seed of all flowering plants.
Double fertilization leads to the formation of the endosperm.
3

In many flowering plants, especially dicots, the endosperm is largely consumed during embryogenesis, so it does not always persist in the mature seed.

Which of the following statements about crossing over during meiosis is correct?

Crossing over increases genetic variation among gametes by exchanging genetic material between homologous chromosomes.
Crossing over results in genetically identical gametes.
Crossing over occurs during mitosis in flowering plants.
Crossing over reduces the number of alleles in a population.
1

Crossing over is a key feature of meiosis that results in the exchange of genetic material between homologous chromosomes, thereby enhancing genetic diversity.

Which of the following statements regarding pollen viability is correct?

Pollen viability remains constant across all species.
Pollen viability varies among species, with some pollen remaining viable for several days under favorable conditions.
Pollen viability is not affected by environmental factors.
Pollen viability is always below 24 hours.
2

Pollen viability can vary widely among species and is influenced by environmental factors such as humidity and temperature.

Which of the following statements about floral symmetry and pollination is correct?

Bilaterally symmetrical (zygomorphic) flowers are often adapted to specific pollinators, enhancing pollination efficiency.
Radially symmetrical (actinomorphic) flowers always result in lower pollination efficiency.
Floral symmetry has no influence on pollinator attraction.
Bilaterally symmetrical flowers inhibit cross-pollination.
1

Bilaterally symmetrical flowers are frequently adapted for interactions with specific pollinators, thereby improving pollination success.

The primary function of the pollen tube is to:

Absorb nutrients from the style
Transport sperm cells to the embryo sac
Provide structural support to the flower
Initiate the formation of the fruit
2

The pollen tube grows through the style to deliver sperm cells to the embryo sac, facilitating fertilization.

Which chemical attractants guide the pollen tube towards the embryo sac?

Auxins
LURE peptides
Gibberellins
Cytokinins
2

LURE peptides, produced by the synergid cells, serve as chemoattractants guiding the pollen tube to the embryo sac.

Which of the following statements about embryo sac types in flowering plants is correct?

The Polygonum type is the most common, while the Allium type is less frequent.
The Allium type is the only embryo sac type found in monocots.
The Allium type always contains 12 nuclei.
There is no variation in embryo sac development among angiosperms.
1

The Polygonum type embryo sac is the most common among angiosperms, whereas the Allium type occurs less frequently and shows minor variations.

Which structure represents the female reproductive organ in a flower?

Stamen
Pistil (Carpel)
Petal
Sepal
2

The pistil or carpel, composed of the stigma, style, and ovary, is the female reproductive part of a flower.

Which ion plays a crucial role in the growth and guidance of the pollen tube?

Sodium (Na+)
Potassium (K+)
Calcium (Ca2+)
Magnesium (Mg2+)
3

Calcium ions are essential for pollen tube growth as they regulate the cytoskeletal elements and membrane fusion events.

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