تمارين أونلاين Biology ||| Unit 1 – Chapter 3 – Part 1 [Reproduction in Living Organisms]

Which feature of living organisms is the least important for individual survival?

The increase in the hereditary variations in the resulting generations occurs through reproduction by means of :

Which of the following structures provides evidence of species that may have failed to successfully reproduce?

Which of the following organisms have a life cycle characterized by presence of an alternation of the sexual and asexual stages ? :

Some plants ; such as banana and pine apple ; naturally form seedless fruits by

Examine the following figures which represent twin embryos formation in the uteri of three pregnant women

By the help of the figures above answer the following questions

1] The embryos blood groups are the same in both of:

Examine the following figures which represent twin embryos formation in the uteri of three pregnant women .

By the help of the figures above answer the following questions

    2] In figure (1) fingerprints of the twin embryos are

Examine the following figures which represent twin embryos formation in the uteri of three pregnant women .

By the help of the figures above answer the following questions

    4] The twin embryos that are produced from two ova, each of them is fertilized by a sperm, are represented by figures :

Examine the following figures which represent twin embryos formation in the uteri of three pregnant women

By the help of the figures above answer the following questions

    5] In which figure, both twin embryos have the same sex?

Examine the following figures which represent twin embryos formation in the uteri of three pregnant women .

By the help of the figures above answer the following questions

6] In figure (1) each of the twin embryos has

Examine the following figures which represent twin embryos formation in the uteri of three pregnant women

By the help of the figures above answer the following questions

    7] In figure (2) each of the twin embryos has…………….

Which of these species (A to E) has a reproductive capacity different from that of the others?

What are the characteristics of female gametes?

During the life cycle of the ornamental fern (Polypodium), a zygote is produced. What plant form does it develop into?

The moving stage of Plasmodium malaria is the :

In adiuntum the…………………

Which of these structural features is present in wind-pollinated flowers?

 Plasmodium is a parasite that lives in two hosts, humans and mosquitoes, as shown in the figure. An alternation of generations can also be seen in its life cycle.

At which stage in the Plasmodium life cycle does fertilization occur?

Which of the following materials doesn’t transport through mother’s placenta to her embryo?

Where in the figure of the half flower shown does meiosis happen?

Why are the secretions from the exocrine glands of the male reproductive system alkaline?

What is the route taken by spermatozoa from their site of production to their exit from the body?

How many eggs (ova) are produced from each cell that begins meiosis?

Which process in egg development occurs in the ovary of a female embryo?

In females, when is meiosis II completed?

How many chromosomes are in a human zygote?

1500 women use condoms as their only form of contraception. In a year, 32 have unexpected pregnancies. How effective are condoms? Give your answer in a percentage to the nearest whole number.

Which of the following is not a use of gamete banks?

During the course of events of menstrual cycle, the secretion of progesterone, FSH and estrogen increases, Which of the following does represent the correct succession for the increase in each of the three hormones from the beginning of this cycle ?