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Name three factors in seeds that cause dormancy.
Date posted:
May 12, 2017
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State four applications of plant hormones in agriculture.
Date posted:
May 12, 2017
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During germination and early growth, the day weight of the endosperm decreases while that of the embryo increases. Explain
Date posted:
May 12, 2017
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The diagram below represents a set up to investigate the conditions necessary for seed germination.
The set up was left for 7 days.
(a) What conditions were being investigated in the experiment?
(b) State three reasons for soaking seeds in set ups A and B.
(c) What were the expected results after seven days
Date posted:
May 12, 2017
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State two advantages of metarmorphosis to the life of insects.
Date posted:
May 12, 2017
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A student set up an experiment as shown in the diagram below.
The set up was at room temperature for a week.
(a) What was the aim of the experiment?
(b) What would be the expected results at the end of the experiment.
(c) Account for the observation made in set up A.
Date posted:
May 12, 2017
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The diagram below represents human foetus in a uterus.
(a) Name the part labeled S.
(b)(i) Name the types of blood vessels found in the structures labeled Q.
(ii) State the differences in composition of blood found in the vessels named in (b) above
(c) Name two features that enable the structure labelled P carry out its function
(d) State the role of the part labeled R.
Date posted:
May 12, 2017
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State three differences between the end products of mitosis and meiosis
Date posted:
May 9, 2017
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State two functions of the placenta in mammals.
Date posted:
May 9, 2017
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How is the human sperm cell structurally specialized?
Date posted:
May 9, 2017
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Name two substances that leaves the foetal blood through the placenta.
Date posted:
May 9, 2017
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What name is given to a group of hormones that controls the development of secondary sexual characteristics in a human male
Date posted:
May 9, 2017
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The diagram below represents a human reproductive organ.
(i) Explain two adaptations of the structure labeled L to its functions
(ii) Explain the role of the gland labeled K.
Date posted:
May 9, 2017
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Name the gamete cells that are produced by the ovaries
Date posted:
May 9, 2017
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What is the function of the following structures in the human reproductive organs (a) Fallopian tubes. (b) Epididymis. (c) Scrotal sac
Date posted:
May 9, 2017
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State two advantages of internal fertilization in humans.
Date posted:
May 9, 2017
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(a)Pregnancy continues if the ovary of an expectant mother is removed after the 4 th month. Explain.
(b) What is the role of the testes in the mammalian reproductive systems.
Date posted:
May 9, 2017
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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
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State a function of amniotic fluid.
Date posted:
May 9, 2017
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State the mode of asexual reproduction in yeast.
Date posted:
May 9, 2017
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State two disadvantages of sexual reproduction in animals
Date posted:
May 9, 2017
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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
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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
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During which phase of meiosis does crossing over occur.
Date posted:
May 9, 2017
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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
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Explain why sexual reproduction is important in organisms.
Date posted:
May 9, 2017
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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
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Give a reason why it is necessary for frogs to lay many eggs.
Date posted:
May 9, 2017
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Explain how the following prevent self-pollination. (i) Protandry (ii) Self-sterility.
Date posted:
May 9, 2017
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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