This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on “Sexual Reproduction in Flowering Plants”.
1. What is the reproductive unit in angiosperms?
Explanation: Flowers are the reproductive units of angiosperms. Angiosperms are flowering plants. Its inside the flowers that the male and female reproductive structures exist. Stamens in case of males and pistil in case of females.
2. Fruits and seeds are formed before fertilization.
Explanation: Fruits and seeds are formed after fertilization. When the pollen grains fall on the stigma of the flower, fertilization process begins. When fertilization takes place, ovaries and ovules form parts of a fruit while the rest of the parts wither and fall off.
3. What are the four whorls of the flower arranged on?
Explanation: The four whorls of the flower are arranged successively on a swollen end of a stalk or pedicel known as the thalamus or the receptacle. The receptacle gives rise to edible parts of the fruit.
4. Why are petals unique in shape, odor, color, etc.?
Explanation: Flowers are unique in color, shape, odor, etc. for pollination. It is necessary to attract insects and animals for cross pollination and having sweet odor and attractive shapes and colors helps in attracting them. Pollination is a pre-requisite for fertilization.
5. What is a collection of sepals?
Explanation: Collection of sepals is known as calyx. Floral parts like calyx and various other parts help in the dispersal of fruits and seeds. Corolla is also known as petals. Style is a part of the gynoecium that helps in pollination.
6. Cross pollination offers variation.
Explanation: Cross pollination is usually carried out by insects and animals or the environment. When insects land on the flower, the sticky pollen grains that carry the male gamete attach themselves to the insect body. When the same insect goes and lands on another flower, the pollen grains land on the stigma. This is cross pollination. Since fertilization is happening between male and female gametes of different flower, variation is seen which helps in adapting itself to the changing weather conditions.
7. What does the following picture depict?
Explanation: Flowers that are unisexual and have only female reproductive structures are known as gynoecium flowers. It consists of style, stigma and ovary. The part marked in blue is the stigma, the yellow line indicates the style and the light green part is the ovary.
8. Anthers and filaments form the _____
Explanation: Androecium consists of the anthers and filaments. They are the male reproductive structures. Male gametes that are in pollen grains are on the anthers. Depending on the species, the stamens (anthers and filaments) may or may not protrude out of the flower.
9. What is self-pollination?
a) Pollens of a flower falling on another flower
b) Pollens of a flower falling on the stigma of the same flower
c) Pollens of the flower falling of the stigma of another flower of the same plant
d) Pollens of a flower falling on any flower
Explanation: Self-pollination means fertilization by pollens of the same flower. When the pollens from the anther fall on the stigma of the same flower, the style carries the pollen to the ovaries. This is known as self-pollination.
10. What does the androecium produce?
Explanation: Androecium collectively consists of the stamens, that is anthers and filaments. Anthers consists of the pollen grains. It’s within the pollen grains that the microspores are present. They form the male gamete.
Sanfoundry Global Education & Learning Series – Biology – Class 12.
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