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Biology

GCSE · Edexcel

QuestionsFlashcards

Photosynthesis
Plant Structure
Transport in Plants
Plant Hormones
- Plant Hormones & Growth
  7
- Using Plant Hormones Commercially
  7

Transport in Animals
- The Need for Transport
  7
- Factors Affecting the Rate of Diffusion
  7
Respiration
- Respiration
  6
- Practical: Investigating Respiration
  5
Gas Exchange
Circulatory System
- The Blood & Blood Vessels
  6
- The Circulatory System
  8

Specialised Cells Flashcards

All 7 cards in this deck

What is the function of the acrosome in a sperm cell?: Contains digestive enzymes that break down the outer layers of the egg cell so the sperm can enter.
Why does a sperm cell contain many mitochondria?: To release energy by respiration so the tail can beat and the sperm can swim to the egg.
Why do sperm cells and egg cells have a haploid nucleus?: Each has only half the number of chromosomes, so fertilisation restores the full number in the zygote.
What happens to the egg cell membrane immediately after fertilisation?: It changes so that no more sperm can enter the egg.
Why does the cytoplasm of an egg cell contain nutrients?: To supply the developing embryo with food (energy) after fertilisation.
How is a ciliated epithelial cell adapted to its function in the airways?: It has cilia on its surface that beat to waft mucus (with trapped dust and bacteria) away from the lungs.
True or false? The tail of a sperm cell releases the energy the sperm needs to swim.: False. The tail propels the cell; the energy is released by the many mitochondria.