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K.C.S.E Biology Q & A - MODEL 2019PP1QN09

1/7/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2019PP1QN09

Below is a photograph of Brassica oleracea, Sukuma wiki leaf.
Picture
​(a)State two observable features that adapt the leaf to gaseous exchange.
(b) Explain the relationship between photosynthesis and aerobic respiration within the leaf.
answers
​.(a) broad leaf blade /lamina; that expose more stomata for gaseous exchange; acc broad leaf alone
(b) photosynthesis (within the leaf in the presence of light energy) yield simple carbohydrates /glucose /sugars which form the main substrate during aerobic respiration (producing energy (ATP)
During the process of respiration carbon iv oxide produced is intern used as a raw material in photosynthesis;
During photosynthesis water is broken down yielding oxygen which is needed/ used in (cellular) (aerobic respiration);
Comments

K.C.S.E Biology Q & A - MODEL 2017PP2QN06

1/7/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2017PP2QN06

In an investigation, two potted plants G and H belonging to the same species were exposed to increasing light intensities at different temperatures, 30°C and 20°C respectively. The rate of photosynthesis was measured for each plant and results recorded as shown in the table below:
Picture
​(a) On the same axis, plot graphs of rate of photosynthesis against light intensity for plants G and H. 
(b) State the aim of the investigation. 
(c) Account for the difference in the rate of photosynthesis in the two plants.
(d) Account for the difference in the rate of photosynthesis in the two plants between the following light intensities:
(i) 1—4 units 
(ii) 4—8 units. 
(e) (i) Predict the rate of photosynthesis at light intensity of 16 units. 
(ii) Give a reason for your answer in (e) (i) above. 
(f) State one internal and one external factor that could be limiting in the investigation.
answers
Picture
b) To investigate/compare the effect of (varying) light intensity/temperature on the rate of photosynthesis;
c) Rate of photosynthesis is higher in plant G (than H); (Photosynthesis being an enzymatic process), enzymes were subjected to favourable/optimal temperatures (of 30°C): hence more activated, unlike in plant H where temperatures were lower (20C); 
d) (i) 1-4 units
Rapid increase in rate of photosynthesis increases with the increase in light intensity; due to increase in light energy for photosynthesis/formation of more ATP molecules;
(ii) 4 — 8 units 
Slower/gradual increase in the rate of photosynthesis as the light intensity increases: because other factors become limiting/some chlorophyll molecules start bleaching;
e) i) Slight increase/no significant increase/remains constant;
ii) The optimum light intensity has been exceeded/some chlorophyll could be destroyed;
f) Internal factor — Chlorophyll/enzyme concentration;
External factor — Carbon (IV) oxide concentration/amount of water;
Comments

K.C.S.E Biology Q & A - MODEL 2015PP2QN04

29/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2015PP2QN04

In an experiment to investigate a factor affecting photosynthesis, a potted plant which had been kept in the dark overnight was treated as shown in the diagram below and exposed to light.
Picture
​(a) Why was the potted plant kept in the dark overnight’? 
(b) Which factor was being investigated in the experiment? 
(c) (i) Which test did the students perform to confirm photosynthesis in the leaves labelled P and Q? 
(ii) State the results obtained in the leaves labelled P and Q.
P             
Q              
(iii) Explain the results obtained in the leaves labelled P and Q. 
P
Q           
(d) What was the purpose of leaf Q in the experiment?
ANSWERS
(a) To destarch/remove starch from the leaves; 
(b) Carbon (IV) Oxide/CO2;
(c) (i) Test for starch; 
(ii) p - Retained the colour of iodine solution/brown/yellow; 
Q - Turned blue-black/black/dark-blue;
(iii) P - Did not photosynthesize /no starch is formed because Sodium Hydroxide pellets absorbed Carbon (IV) Oxide;
Q - Photosynthesized /starch was formed because Carbon (IV) Oxide was in the flask;
(d) Control (experiment); 
Comments

What happens to the glucose synthesized during photosynthesis?

29/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2015PP1QN17

What happens to the glucose synthesized during photosynthesis?

Picture
answers
  •  Used in plant respiration to produce energy;
  •  Converted to starch/sucrose/lipids/Proteins/cellulose and stored; for future use.
Comments

K.C.S.E Biology Q & A - MODEL 2014PP2QN07

28/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2014PP2QN07

Explain how each of the following factors affects the rate of photosynthesis:
(i) temperature; 
(ii) chlorophyll concentration.
Picture
answers
(i) Reactions in photosynthesis are catalysed by enzymes; at optimum temperature photosynthesis proceeds faster;
Below optimum temperature the rate of photosynthesis decreases because enzymes are inactivated by the low temperatures / above optimum the rate
of photosynthesis decreases because enzymes are denatured; 
(ii) Chlorophyll traps energy from sunlight for photosynthesis;
The higher the chlorophyll concentration the higher the rate of photosynthesis and vice versa;
Comments

K.C.S.E Biology Q & A - MODEL 2013PP2QN03

28/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2013PP2QN03

(a) Explain the importance of the following in photosynthesis: 
(i) light;
(ii) carbon(IV) oxide;
(iii) chlorophyll.

Picture
(b) Name one appropriate food substance for each of the following enzymes: 
(i) ptyalin 
(ii) pepsin
(c) State the cause and two symptoms of Ben-ben.
 Cause             
Symptoms â€‹
answers
​(a) (i) Provides energy needed to split water molecules into oxygen and hydrogen/photolysis;
Provides energy for formation of ATP molecules (which is used in dark stage)
(ii) Combines with hydrogen ions to make glucose;
(iii) Used to trap light energy;
(b) (i) Starch;
(ii) Protein;
(c) (i) Lack of vitamin B1/thiamine; 
(ii) . Stunted growth;
 Paralysis of legs/arms/limbs/damage to peripheral nerves;
Heart failure
 Swelling of  feet/oedema
 Gastrointestinal disturbances/loss of appetite/constipation/diarrhoea/vomiting;
 Weight loss/muscle wasting
 Pale skin
Comments

K.C.S.E Biology Q & A - MODEL 2009PP1QN18

23/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2009PP1QN18

Explain how the following factors affect the rate of photosynthesis:
(a) Concentration of carbon (iv) oxide 
(b) Light intensity 
Picture
ANSWERS
​(a) Rate of photosynthesis increases as CO2 concentration increases up to a certain  level/ optimum level  and  ( vise versa)Reverse:
b)The rate of photosynthesis decreases with decrease in CO2 concentration until it stop rate of photosynthesis increases as the light intensity up to an optimum level (and vice versa)
Comments

K.C.S.E Biology Q & A - MODEL 2008PP2QN03

22/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2008PP2QN03

The equation below represents a process that takes place in plants
 6CO2 + 6H2O→C6H12O6 + 602

(a) Name the process 
(b) State two conditions necessary for the process to take place 
(c) State what happens to the end- products of the process 
Picture
answers
(a)   Photosynthesis
 (b)   Light (energy)
      Chlorophyll
 (c)   Oxygen – used in respiration, oxidation
   Released into the atmosphere
   Glucose – used in respiration
  Converted to sucrose or starch for storage
  Used in formation of sturdiness allulose cell wall/ cytoplasm
Comments

K.C.S.E Biology Q & A - MODEL 2008PP1QN24

22/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2008PP1QN24

Name the sites where light and dark reactions of photosynthesis take place 
Light reaction
Dark reaction
Picture
ANSWERS
  • Light reaction – Granum/ lamellae/ mitochondria/ thylokoid
  • Dark reaction - Stroma
Comments

K.C.S.E Biology Q & A - MODEL 2008PP1QN16

22/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2008PP1QN16

The diagram below represents a set up that was used to investigate certain process in a plant
Picture
(a) State the process that was being investigated 
(b) State a factor that would affect the process 
ANSWERS
(a) Photosynthesis
(b) Carbon (iv) Oxide/ Temp/ chlorophyll
Comments

Describe what happens during the light stage of photosynthesis

21/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2007PP1QN06

Describe what happens during the light stage of photosynthesis

Picture
ANSWER
  • Take place in the grana of the chloroplast. Light is absorbed and used to split water molecules into hydrogen ions and oxygen, photolysis. Energy is formed and is stored in form of ATP
Comments

Name the end products of the light stage in photosynthesis.

19/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2006PP1QN27

Name the end products of the light stage in photosynthesis.

Picture
answers
  •  Hydrogen; Oxygen
Comments

Name two mineral elements that are necessary in the synthesis of chlorophyll.

18/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2004PP1QN09

Name two mineral elements that are necessary in the synthesis of chlorophyll.

Picture
answers
  • Nitrogen;
  • Magnesium;
  • Iron,
Comments

How are leaves of submerged adapted plants for photosynthesis?

17/6/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2003PP1QN10

How are leaves of submerged adapted plants for photosynthesis?

Picture
answers
  • Numerous chloroplasts to absorb light / epidermis have chloroplasts to absorb light.
  • Deeply divided / truncated leaves / branched leaves to increase surface area.
  • Large air spaces for storage of air / buoyancy; acc parenchyma tissue for storage of air
  • Have no cuticle to facilitate exchange of gases
Comments

K.C.S.E Biology Q & A - MODEL 1998PP1QN14

15/6/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 1998PP1QN14

In an experiment to investigate a factor affecting photosynthesis, a leaf of a potted  plant which had been kept in the dark overnight was covered with aluminum foil as shown in the diagram below
Picture
The set up was kept in sunlight for three hours after which a food test was carried out on the leaf.
(a) Which factor was being investigated in the experiment?
(b) What food test was carried out?
(c) (i) State the results of the food test
(ii) Account for the results in c (i) above
(d) Why was it necessary to keep the plant in darkness; before the experiment?
ANSWERS
(a) Light; Rej:  light intensity
(b) Test for starch
(c) (i) The covered part of the leaf remain brown/yellow/ retain color of iodine, and the uncovered parts turned blue/ black; rej blue  alone black  alone.
(ii) Starch was formed in the covered part of the leaf  (because of the  presence);  while starch was  not formed in the covered part of the leaf ( because of lack light)
(d) To destarch the leaf;
Comments
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