FBISE Class 9th (SSC-l)
Explore subjects and practice MCQs
3
Chapters
1,610
Total MCQs
FBISE Class 9th (SSC-l)
Answer: Wind-pollinated flowers are small and inconspicuous because they do not need to attract insects.
Answer: The stigma is the sticky top of the pistil that catches and holds pollen grains.
Answer: In double fertilization, one male gamete fuses with the egg and the other with the polar nuclei to form endosperm.
Answer: Sepals are the outermost green parts of a flower that protect the developing bud.
Answer: Wind-pollinated plants produce light, dry pollen so that wind can carry it easily.
Answer: The pollen tube grows through the style and ovary and delivers the male gametes to the ovule.
Answer: Fertilization is the fusion of a male gamete with a female gamete to form a zygote.
Answer: Dichogamy is the condition where stamens and stigma mature at different times, preventing self-pollination.
Answer: After fertilization, the ovary enlarges and develops into the fruit.
Answer: The ovary wall thickens after fertilization and becomes the pericarp (fruit wall).
Answer: Each ovule in the ovary develops into a seed after fertilization.
Answer: Once fertilization occurs, the petals usually wither and fall because they are no longer needed.
Answer: Vegetative propagation involves mitosis only, so the new plants are genetically identical clones of the parent.
Answer: In epigeal germination, the hypocotyl elongates and lifts the cotyledons above the soil surface.
Answer: Water, oxygen and a suitable temperature are the essential conditions for seed germination.
Answer: In hypogeal germination, the cotyledons remain below the soil while the plumule emerges above it.
Answer: Pea shows hypogeal germination because its cotyledons stay below the ground during germination.
Answer: In layering, a branch is bent down and covered with soil; once roots form at the covered part, the branch becomes a new plant.
Answer: The pollen tube carries the male gamete down to the ovule, where the egg cell is located.
Answer: Bean shows epigeal germination, in which the cotyledons are lifted above the soil by the elongating hypocotyl.