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(a) The placenta takes over the role of the ovary of producing the hormone progesterone which maintains pregnancy.
(b) - Production of male gametes/ spermatozoa
- Production of Androgen i.e. testosterone hormone which influences secondary sexual characteristics
johnmulu answered the question on May 9, 2017 at 10:30
- The figure shows changes that take place during menstrual cycle in human. (Solved)
The figure shows changes that take place during menstrual cycle in human.
(a) Name the hormone whose concentrations are represented by curves F and G.
(b) State the effects of the hormones named (a) above on the lining of the uterus.
Date posted: May 9, 2017. Answers (1)
- State a function of amniotic fluid. (Solved)
State a function of amniotic fluid.
Date posted: May 9, 2017. Answers (1)
- State the mode of asexual reproduction in yeast. (Solved)
State the mode of asexual reproduction in yeast.
Date posted: May 9, 2017. Answers (1)
- State two disadvantages of sexual reproduction in animals (Solved)
State two disadvantages of sexual reproduction in animals
Date posted: May 9, 2017. Answers (1)
- The diagram below represents a stage during cell division(Solved)
The diagram below represents a stage during cell division
(a) (i) Identify the stage of cell division
(ii) Give three reasons for your answer in (a) (i) above
(b) Name the structures labeled M.
(c) State the significance of this stage of cell division in living organisms.
Date posted: May 9, 2017. Answers (1)
- The diagram below represents human foetus in a uterus. (Solved)
The diagram below represents human foetus in a uterus.
(a) Name the part labeled S.
(b) Name two features that enable the structure labeled P carry out its function.
(c) State the role of the parts labeled R.
Date posted: May 9, 2017. Answers (1)
- (a) State two processes which occur during anaphase of mitosis
(b) What is significance of meiosis? (Solved)
(a) State two processes which occur during anaphase of mitosis
(b) What is significance of meiosis?
Date posted: May 9, 2017. Answers (1)
- During which phase of meiosis does crossing over occur. (Solved)
During which phase of meiosis does crossing over occur.
Date posted: May 9, 2017. Answers (1)
- The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal. (Solved)
The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal.
(a) What type of cell division takes place at Z.
(b) Where in the body of a female does process Z occur.
(c) Name the process that leads to addition or loss of one or more chromosomes
(d) Name the process that leads to addition or loss of one or more chromosomes
(e) State three benefits of polyloidy in plants to a farmer.
Date posted: May 9, 2017. Answers (1)
- (a) What is the significance of sexual reproduction?
(b) State three advantages of asexual reproduction. (Solved)
(a) What is the significance of sexual reproduction?
(b) State three advantages of asexual reproduction.
Date posted: May 9, 2017. Answers (1)
- Explain why sexual reproduction is important in organisms. (Solved)
Explain why sexual reproduction is important in organisms.
Date posted: May 9, 2017. Answers (1)
- Fig 1 and 2 below represent reproductive organ of plants and an animal respectively.(Solved)
Fig 1 and 2 below represent reproductive organ of plants and an animal respectively.
(a) Which letters in Fig. 1 and Fig. 2 represents the organs that produce female gametes?
Fig. 1:...
Fig. 2...
(b) What is the function of the structure labelled S?
(c) Name the structure labeled W.
(d) Which letters in Fig. 1 and Fig. 2 represents the structures where fertilization takes place?
(e) Which letter in Fig. 1 represents the structure where male gametes are produced?
Date posted: May 9, 2017. Answers (1)
- Give a reason why it is necessary for frogs to lay many eggs. (Solved)
Give a reason why it is necessary for frogs to lay many eggs.
Date posted: May 9, 2017. Answers (1)
- Explain how the following prevent self-pollination. (i) Protandry (ii) Self-sterility.(Solved)
Explain how the following prevent self-pollination. (i) Protandry (ii) Self-sterility.
Date posted: May 9, 2017. Answers (1)
- The diagram below illustrates the structure of the female part of a flower.(Solved)
The diagram below illustrates the structure of the female part of a flower.
(a) Name the part labelled W.
(b) Describe what happens when pollen tubes enters the structure labelled V
(c) What do structures labelled R and T develop into after fertilization?
Date posted: May 9, 2017. Answers (1)
- The photomicrographs below show the various stages of cell division in a certain plant(Solved)
The photomicrographs below show the various stages of cell division in a certain plant
(a) (i) Name the type of cell division illustrated.
(ii) Give a reason for your answer in (a) (i) above.
(b)(i) Name the stage of cell division labelled K.
(ii) Give a reason for your answer in (b) (i) above.
Date posted: May 9, 2017. Answers (1)
- State four characteristics of fruit dispersed by animals. (Solved)
State four characteristics of fruit dispersed by animals.
Date posted: May 9, 2017. Answers (1)
- The diagram below illustrates a growing pollen tube. (Solved)
The diagram below illustrates a growing pollen tube.
(a) Name the part labeled B.
(b) Explain the role of the parts labeled A.
Date posted: May 9, 2017. Answers (1)
- Name the flower part that produces gametes. (Solved)
Name the flower part that produces gametes.
Date posted: May 9, 2017. Answers (1)
- Name three mechanisms that ensure cross pollination takes place in flowering plants. (Solved)
Name three mechanisms that ensure cross pollination takes place in flowering plants.
Date posted: May 9, 2017. Answers (1)