Sexual Reproduction in Flowering Plants — Flashcards
Punjab Board · Class 12 · Biology
27 flashcards for Sexual Reproduction in Flowering Plants (Punjab Board Class 12 Biology) to test yourself on key terms and facts.
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What is a flower and what are its two most important reproductive structures?
Answer
A flower is a specialized reproductive organ of angiosperms that contains the sites of sexual reproduction. The two most important reproductive structures are: (1) Androecium - consisting of stamens (…
Define and describe the structure of a stamen, including its parts.
Answer
A stamen is the male reproductive organ of a flower consisting of two main parts: (1) Filament - a long, slender stalk that attaches to the thalamus or petal, and (2) Anther - the terminal, typically …
What is a microsporangium and what are its four wall layers? What is the function of each?
Answer
A microsporangium is a pollen sac within the anther that contains developing pollen grains. It is surrounded by four distinct wall layers from outer to inner: (1) Epidermis - provides protection, (2) …
Explain microsporogenesis and describe what happens to the sporogenous tissue.
Answer
Microsporogenesis is the process of formation of microspores from a pollen mother cell (PMC) through meiosis. The sporogenous tissue in the centre of a young microsporangium consists of compactly arra…
What is the structure and composition of a mature pollen grain?
Answer
A mature pollen grain has the following structure: (1) Two-layered wall: Exine (outer, hard layer made of sporopollenin - extremely resistant organic material) and Intine (inner, thin layer of cellulo…
What is sporopollenin and why is it so important in pollen grains?
Answer
Sporopollenin is the extremely resistant organic material that comprises the exine (outer layer) of pollen grains. It is one of the most resistant organic materials known, capable of withstanding high…
What is the difference between pollen viability in different plant species?
Answer
Pollen viability - the period for which pollen grains remain capable of fertilization - varies greatly among different plant species and depends on temperature and humidity conditions. In some cereals…
Describe the parts of a pistil and their functions.
Answer
A pistil (female reproductive organ) consists of three main parts: (1) Stigma - the terminal receptive surface that serves as a landing platform for pollen grains, often sticky or feathery to trap pol…
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