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- Few number of organisms reproducing
- Overcrowding
- Accumulation of toxic wastes
- Limited resources such as nutrients, hence stiff competition
johnmulu answered the question on May 12, 2017 at 09:26
- In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below. (Solved)
In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below.
(a) State the expected results after 2 weeks.
(b) Give a reason for your answer in (a) above
Date posted: May 12, 2017. Answers (1)
- (a) The state during which a seed cannot germinate even when conditions for germination are suitable is called
(b) The diagram below represents a stage during germination of a seed. (Solved)
(a) The state during which a seed cannot germinate even when conditions for germination are suitable is called
(b) The diagram below represents a stage during germination of a seed.
(i) Name the type of germination illustrated in the diagram.
(ii) State the role of the part labeled x during germination of the seed
Date posted: May 12, 2017. Answers (1)
- Name a growth inhibitor in seeds. (Solved)
Name a growth inhibitor in seeds.
Date posted: May 12, 2017. Answers (1)
- Account for the following phases of a sigmoid curve of a growth of an organism (a) Lag phase (b) Plateau phase (Solved)
Account for the following phases of a sigmoid curve of a growth of an organism (a) Lag phase (b) Plateau phase
Date posted: May 12, 2017. Answers (1)
- (a) State two environmental conditions that cause seed dormancy
(b) Name the part of a bean that elongates to bring about epigeal germination. (Solved)
(a) State two environmental conditions that cause seed dormancy
(b) Name the part of a bean that elongates to bring about epigeal germination.
Date posted: May 12, 2017. Answers (1)
- (a) Distinguish between epigeal and hypogeal germination.
(b) Why is oxygen necessary in the germination of seeds? (Solved)
(a) Distinguish between epigeal and hypogeal germination.
(b) Why is oxygen necessary in the germination of seeds?
Date posted: May 12, 2017. Answers (1)
- Name three factors in seeds that cause dormancy. (Solved)
Name three factors in seeds that cause dormancy.
Date posted: May 12, 2017. Answers (1)
- State four applications of plant hormones in agriculture. (Solved)
State four applications of plant hormones in agriculture.
Date posted: May 12, 2017. Answers (1)
- During germination and early growth, the day weight of the endosperm decreases while that of the embryo increases. Explain(Solved)
During germination and early growth, the day weight of the endosperm decreases while that of the embryo increases. Explain
Date posted: May 12, 2017. Answers (1)
- The diagram below represents a set up to investigate the conditions necessary for seed germination. (Solved)
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. Answers (1)
- State two advantages of metarmorphosis to the life of insects. (Solved)
State two advantages of metarmorphosis to the life of insects.
Date posted: May 12, 2017. Answers (1)
- A student set up an experiment as shown in the diagram below. (Solved)
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. 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)(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. Answers (1)
- (a) State two disadvantages of sexual reproduction in animals.
(b) State two functions of the placenta in mammals (Solved)
(a) State two disadvantages of sexual reproduction in animals.
(b) State two functions of the placenta in mammals
Date posted: May 12, 2017. Answers (1)
- State three differences between the end products of mitosis and meiosis(Solved)
State three differences between the end products of mitosis and meiosis
Date posted: May 9, 2017. Answers (1)
- Explain why (a) Mammalian testes are located to hang outside the body.
(b) Four months after fertilization, ovaries can be removed from a human female without terminating pregnancy(Solved)
Explain why (a) Mammalian testes are located to hang outside the body.
(b) Four months after fertilization, ovaries can be removed from a human female without terminating pregnancy
Date posted: May 9, 2017. Answers (1)
- State two functions of the placenta in mammals. (Solved)
State two functions of the placenta in mammals.
Date posted: May 9, 2017. Answers (1)
- How is the human sperm cell structurally specialized? (Solved)
How is the human sperm cell structurally specialized?
Date posted: May 9, 2017. Answers (1)
- Name two substances that leaves the foetal blood through the placenta. (Solved)
Name two substances that leaves the foetal blood through the placenta.
Date posted: May 9, 2017. Answers (1)
- What name is given to a group of hormones that controls the development of secondary sexual characteristics in a human male(Solved)
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. Answers (1)