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

Get unlimited access to the best preparation resource for Bank-PO : get questions, notes, tests, video lectures and more- for all subjects of Bank-PO.

Passage

Reproduction is a characteristic of all living organisms.

Question 278 (2 of 4 Based on Passage)

Write in Short

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)

Write in Short

Short Answer▾

Fig. shows some examples of reproduction.

Single Celled Organism

State the letter or letters that identify examples of asexual reproduction.

Give a reason for your answer using evidence from Fig.

letter (s) …

reason …

Explanation

A & C

Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two (replicates) . The bacterial cell then elongates and splits into two daughter cells each with identical DNA to the parent cell. Each daughter cell is a clone of the parent cell.

Amoeba reproduces by the common asexual reproduction method called binary fission. After replicating its genetic material through mitotic division, the cell divides into two equal sized daughter cells. The genetic material is also equally partitioned; therefore, the daughter cells are genetically identical to each other and the parent cell. In this process, the nucleus of the Amoeba first divides to form two daughter nuclei by the process of Karyokinesis. After the nucleus has divided into two, the process of Cytokinesis takes place in which the cytoplasm in the mother cell divides into two daughter cells.

Developed by: