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-Diaphragm muscles contract; diaphragm flattens increasing the volume of thoracic cavity;
-While pressure reduces than the atmospheric pressure; hence air rushes into the lungs
marto answered the question on September 25, 2019 at 07:32
- Name two organisms that exhibit symbiotic relationship and explain how each benefits from the association.(Solved)
Name two organisms that exhibit symbiotic relationship and explain how each benefits from the association.
Date posted: September 25, 2019. Answers (1)
- State two types of mechanical digestion along the digestive tract.(Solved)
State two types of mechanical digestion along the digestive tract.
Date posted: September 25, 2019. Answers (1)
- In relation to transport in animals, give a reason why carbohydrates are the best source of energy.(Solved)
In relation to transport in animals, give a reason why carbohydrates are the best source of energy.
Date posted: September 25, 2019. Answers (1)
- The diagram below shows blood circulation in a bony fish. Use it to answer the questions that follow.(Solved)
The diagram below shows blood circulation in a bony fish. Use it to answer the questions that follow.
Name the structures labelled A and B.
Date posted: September 25, 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 process represented by the arrows.
b) Name the cell labelled 2.
c) Name the tissue formed by each of the following cells
i) 1
ii) 3
Date posted: September 25, 2019. Answers (1)
- student peeled off a piece of epidermis from an onion leaf and observed it under a microscope. He counted 10 cells across the diameter of...(Solved)
student peeled off a piece of epidermis from an onion leaf and observed it under a microscope. He counted 10 cells across the diameter of the field of view. He then placed a transparent ruler across the field of view and observed the following.
Calculate the size of one cell in μm. show your working
Date posted: September 25, 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) Identify the bones labelled A and B.
b) Name the joint found in the region labelled Y.
Date posted: September 25, 2019. Answers (1)
- Name two plant tissues that are thickened with lignin.(Solved)
Name two plant tissues that are thickened with lignin.
Date posted: September 25, 2019. Answers (1)
- State two unique physical characteristics of skeletal muscles(Solved)
State two unique physical characteristics of skeletal muscles.
Date posted: September 25, 2019. Answers (1)
- An experiment to investigate a certain response by termites, was set up as shown below. The set up was exposed to the sun for some...(Solved)
An experiment to investigate a certain response by termites, was set up as shown below. The set up was exposed to the sun for some time.
a) What were the results at the end of the experiment?
b) Name the type of response exhibited by the termites.
c) Give one survival value of the response.
Date posted: September 25, 2019. Answers (1)
- What is the role of decomposers in an ecosystem?(Solved)
What is the role of decomposers in an ecosystem?
Date posted: September 25, 2019. Answers (1)
- State two ways in which energy flow in an ecosystem can be expressed.(Solved)
State two ways in which energy flow in an ecosystem can be expressed.
Date posted: September 25, 2019. Answers (1)
- Study the food web below and answer the questions that follow.(Solved)
Study the food web below and answer the questions that follow.
a) Write down a food chain whose all consumers are Arthropods.
b) What would be the short term effects on the habitat if all trout fish were eliminated?
Date posted: September 25, 2019. Answers (1)
- The Scientific name of confused beetle is TRIBOLIUM CONFUSAM. Identify any three mistakes made in writing the name.(Solved)
The Scientific name of confused beetle is TRIBOLIUM CONFUSAM. Identify any three mistakes made in writing the name.
Date posted: September 25, 2019. Answers (1)
- The figures below represent two phases of actively dividing cell.(Solved)
The figures below represent two phases of actively dividing cell.
a) Name the phases marked M and N.
b) Identify the type of cell division.
Date posted: September 25, 2019. Answers (1)
- State the importance of biology in the following areas.
a) Agriculture
b) Environment
c) Food technology(Solved)
State the importance of biology in the following areas.
a) Agriculture
b) Environment
c) Food technology
Date posted: September 25, 2019. Answers (1)
- In an experiment to investigate the action of pepsin on egg albumen, equal amount of pepsin were added to equal amount of egg albumen in...(Solved)
In an experiment to investigate the action of pepsin on egg albumen, equal amount of pepsin were added to equal amount of egg albumen in different test tube. The test tubes were placed in water bath at different temperature. The graph below shows the time taken for the enzymes to digest protein at each temperature.
a) What is the optimum temperature for enzymes?
b) Account for the time taken to digest egg albumen at 600C.
c) With reason name the form in which the enzymes pepsin is secreted.
d) State three other factors that affect enzyme controlled reactions.
Date posted: September 19, 2019. Answers (1)
- The flow chart below, illustrates blood circulation in certain organs in humans.(Solved)
The flow chart below, illustrates blood circulation in certain organs in humans.
a) Name the organ labeled A.
b) Name the blood vessel labeled B and F.
c) State how the consumption of blood in vessel E differs from that in vessel.
d) Name two hormones whose target is the liver when there is variation in simple carbohydrates concentration in blood.
Date posted: September 19, 2019. Answers (1)
- The figure below shows part of a food web for the South Atlantic ocean.(Solved)
The figure below shows part of a food web for the South Atlantic ocean.
a) i) Name the producer in this food web.
ii) Name the top carnivore in this food web.
b) construct a food chain in which leopard seal is a tertiary consumer.
c) In the future, the extraction of mineral resources in the Antarctic might occur on a large scale. This could destroy the breeding-grounds of the Ross seal.
i) State and explain the effects this might have on the population of leopard seal.
ii) List two human activities that can affect the population of organisms in the ecosystem represented by food web.
d) Name the organism with the highest number of predators.
Date posted: September 19, 2019. Answers (1)
- State two ways in which white blood cells carry out their functions.(Solved)
State two ways in which white blood cells carry out their functions.
Date posted: September 19, 2019. Answers (1)