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-some plants are self –sterile in their pollen grains transferred to stigmas in the same plant fail to germinate.
-in some plants stamens and carpel on the same plant mature at different times.
-in many plants the stigmas are located higher than the anthers.
marto answered the question on October 7, 2019 at 06:31
- Name the hormone that Stimulates the disintegration of the corpus inteum when fertilization fails to take place.(Solved)
Name the hormone that Stimulates the disintegration of the corpus inteum when fertilization fails to take place.
Date posted: October 7, 2019. Answers (1)
- Name two mechanisms that hinder self fertilization in flowering plants.(Solved)
Name two mechanisms that hinder self fertilization in flowering plants.
Date posted: October 7, 2019. Answers (1)
- Explain why hormone testosterone still exerts its influence even when vas deferens have been cut.(Solved)
Explain why hormone testosterone still exerts its influence even when vas deferens have been cut.
Date posted: October 7, 2019. Answers (1)
- Explain the term alternation of generations.(Solved)
Explain the term alternation of generations.
Date posted: October 7, 2019. Answers (1)
- The diagram below shows a phenomenon which occurs during cell division.(Solved)
The diagram below shows a phenomenon which occurs during cell division.
(a) Name the part labeled T.
(b) (i) State the biological importance of the part labelled T.
(ii) Identify the type of cell division in which this phenomenon occurs
Date posted: October 7, 2019. Answers (1)
- State the roles of oviduct in female reproductive system.(Solved)
State the roles of oviduct in female reproductive system.
Date posted: October 7, 2019. Answers (1)
- Name the processes that lead to fruit formation without fertilization.(Solved)
Name the processes that lead to fruit formation without fertilization.
Date posted: October 7, 2019. Answers (1)
- Name three main methods through which HIV/AIDS is transmitted.(Solved)
Name three main methods through which HIV/AIDS is transmitted.
Date posted: October 7, 2019. Answers (1)
- The diagram below shows part of a food relationship in an ecosystem:-(Solved)
The diagram below shows part of a food relationship in an ecosystem:-
(a) Name the food relationship above.
(b) How many trophic levels are shown in the diagram above?
(c) State main source of energy in the ecosystem.
Date posted: October 7, 2019. Answers (1)
- Define the following terms:-
(i) Autecology
(ii) Biomass(Solved)
Define the following terms:-
(i) Autecology
(ii) Biomass
Date posted: October 7, 2019. Answers (1)
- The diagram below represents a mammalian nephron.(Solved)
The diagram below represents a mammalian nephron.
(a) Name the structures labeled B,C and D
(c) Name the process by which substances are reabsorbed from structure C into blood capillaries
(d) How is the pressure in structure A achieved?
Date posted: October 7, 2019. Answers (1)
- Describe the path taken by urea from the organ where it is formed until it is released from the human body.(Solved)
Describe the path taken by urea from the organ where it is formed until it is released from the human body.
Date posted: October 7, 2019. Answers (1)
- An experiment was carried out to determine the effect of drinking on excess amount of water on the flow of urine. A person drinks one...(Solved)
An experiment was carried out to determine the effect of drinking on excess amount of water on the flow of urine. A person drinks one litre of water and urine was collected at intervals of 15 minutes.
The results were as shown below.
(a) Plot a suitable graph to represent urine output with time.
(b) Explain the rate of flow of urine between the following times;
(i) 15 and 60 minutes.
(ii) 60 and 75 minutes.
(iii) 75 and 135 minutes.
(c) Name two hormones responsible for regulation of relative amount of salts and water in man.
Date posted: October 7, 2019. Answers (1)
- Study the diagram below and answer the questions that follow.(Solved)
Study the diagram below and answer the questions that follow.
(a) Name the structure represented by the diagram
(b)
(i) Name the parts labelled D and M
(ii) Name the hormones whose sites of action are Q and G (c) Name one substance that is present in part N but absent in part Z
(d) The contents of part V were boiled with Benedicts’ solution and an orange precipitate was
formed. Account for the results
Date posted: October 7, 2019. Answers (1)
- The diagram below represents a mammalian nephron.(Solved)
The diagram below represents a mammalian nephron.
(i) Name the structure labelled Q
(ii) State two adaptations of part labeled R
Date posted: October 4, 2019. Answers (1)
- What role is played by the liver in excretion?(Solved)
What role is played by the liver in excretion?
Date posted: October 4, 2019. Answers (1)
- Explain the effects of the production of large amounts of Antidiuretic hormone in the human body(Solved)
Explain the effects of the production of large amounts of Antidiuretic hormone in the human body
Date posted: October 4, 2019. Answers (1)
- The apparatus below was used to investigate anaerobic respiration:-(Solved)
The apparatus below was used to investigate anaerobic respiration:-
a) How would you remove dissolved oxygen from the glucose before the experiment commencing?
(b) State what happens to the lime water as the experiment proceeds to the end
(c) Describe the reactions in the experiment
(d) Explain what would happen if the temperature of glucose solution and yeast was raised beyond 45 degrees C?
Date posted: October 4, 2019. Answers (1)
- State two roles of adrenaline in man.(Solved)
State two roles of adrenaline in man.
Date posted: October 4, 2019. Answers (1)
- How does the sunkness of stomata help in minimizing the rate of transpiration in plants?(Solved)
How does the sunkness of stomata help in minimizing the rate of transpiration in plants?
Date posted: October 4, 2019. Answers (1)