IGCSE Biology Paper-3: Specimen Questions with Answers 278 - 279 of 358

Passage

Reproduction is a characteristic of all living organisms.

Question 278 (2 of 4 Based on Passage)

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Short Answer▾

The term sexual reproduction is in the box on the left.

The boxes on the right show some sentence endings.

Draw straight lines from sexual reproduction to the boxes on the right to make correct sentences.

Sexual Reproduction

Explanation

Sexual Reproduction

Sexual reproduction is the process in which male and female gamete fuse to form zygote through a process called fertilization and it is important for plants as it provides variation to the progeny that helps in the better survival and help it to gain its own uniqueness within the species and remove the unwanted genes.

The significance of sexual reproduction is:

  • parent can give birth to any number of children
  • two parents are involved
  • population increases

limitations of asexual reproduction:

  • after reproduction the parent organism disappears
  • one parent is involved

Question 279 (3 of 4 Based on Passage)

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Short Answer▾

A specialized cell performs a particular function.

Sperm and egg cells are two types of specialized cell that are involved in reproduction in humans.

State the names of two other specialized cells.

Explanation

Specialized blood cells, specialized nerve cells and specialized muscle cells.

  • Blood: Blood is a connective tissue, fluid matrix of blood is plasma having wandering or floating cells, called corpuscles, blood helps in the transportation of various materials such as nutritive substances, gases, excretory products, hormones etc.
  • Neuron: They are highly specialized tissue due to which the animals can perceive and respond to the stimuli. Their functional unit is called as nerve cell or neuron. Cell body is called cyton which is covered by plasma membrane.
  • Muscular Tissue: Movements are brought about in our body with the help of muscular tissues. They are long fiber-like cells called muscle fibers. They are capable of contraction or relaxation. Types of Muscular Tissue are Striated muscles, cardiac muscle fibers and Non-striated muscles.

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