EVERYDAY SCIENCE

Detailed explanation-1: -Correct option c Cycas Explanation:Cycas is a gymnospermic plant it has the biggest sperms antherozoids and ovules in the plant world.

Detailed explanation-2: -(c) Cycas is a gymnospermic plant. It has the biggest sperms (antherozoids) and ovules in the plant world.

Detailed explanation-3: -Cycads are like all seed-producing plants with a dominant diploid sporophyte phase in their life cycle. The male gametes are motile and ovules are orthotropous. Pollination takes place by air. The sperms cells are the largest and measure up to 300 m in size and visible to the naked eye.

Detailed explanation-4: -Drosophila bifurca is a species of fruit fly. Males of this species are known to have the longest sperm cells of any organism on Earth-5.8 cm long when uncoiled, over twenty times the entire body length of the male. The cells are mostly tail, and are delivered to the females in tangled coils.

Detailed explanation-5: -Cycads, unlike other seed plants, have motile sperm. These are large, up to 300 µm in size. It germinates, the tube nucleus entering the pollen tube which grows through and parasitizes the megasporangium.