Download plants sample questions

1.
The diagram below shows a cross section of a stem. What is the structure labelled Y and one of its
functions?
Structure Y
Function
A.
phloem
storage of water and starch
B.
xylem
mechanical support
C.
phloem
gas exchange
D.
xylem
transport of sugars
(Total 1 mark)
2.
Plants develop brightly coloured flowers to attract animals. Which process is directly assisted by
this adaptation?
A.
Seed dispersal
B.
Pollination
C.
Fertilization
D.
Germination
(Total 1 mark)
1
3.
Which structure is shown in the following image?
[Source: Ohio State University at Lima]
A.
A dicotyledon stem
B.
A monocotyledon stem
C.
A dicotyledon root
D.
A monocotyledon root
(Total 1 mark)
4.
What part of the human body is most similar in function to the spongy mesophyll layer in a leaf?
A.
Alveoli in the lungs
B.
Erythrocytes in the blood
C.
Villi in the small intestine
D.
Sweat glands in the skin
(Total 1 mark)
2
5.
What controls the flowering process in long-day plants?
A.
Pfr is converted by red light to Pr which acts as a promoter of flowering.
B.
Pr is converted by red light to Pfr which acts as an inhibitor of flowering.
C.
Pr is converted by red light to Pfr which acts as a promoter of flowering.
D.
Pfr is converted by red light to Pr which acts as an inhibitor of flowering.
(Total 1 mark)
6.
Up to two additional marks are available for the construction of your answers.
(2)
(a)
The main parts of growing plants are roots, stems and leaves. Draw a plan diagram to show
the arrangement of tissues in the stem of a dicotyledonous plant.
(5)
(b)
Outline the adaptations of plant roots for absorption of mineral ions from the soil.
(5)
(c)
Photosynthesis and transpiration occur in leaves. Explain how temperature affects these
processes.
(8)
(Total 20 marks)
7.
How are fluids transported in the xylem and the phloem?
Xylem
Phloem
A.
away from the root only
towards the root only
B.
towards the root only
away from the root only
C.
away from and towards the root
towards the root only
D.
away from the root only
away from and towards the root
(Total 1 mark)
3
8.
Which plant hormone is responsible for the closing of the stomata?
A.
Gibberellic acid
B.
Abscisic acid
C.
Phytochromes
D.
Ethylene
(Total 1 mark)
9.
What is the effect of abscisic acid on transpiration?
A.
It increases transpiration by causing the stomata to open.
B.
It decreases transpiration by causing the stomata to close.
C.
It increases transpiration by decreasing the humidity inside the leaf.
D.
It decreases transpiration by increasing the humidity inside the leaf.
(Total 1 mark)
10.
What is the correct sequence of events in the germination of a starch seed?
A.
gibberellin
produced
water
absorbed
hydrolysis of
food reserves
protein
synthesis
enzymes
produced
B.
water
absorbed
hydrolysis of
food reserves
protein
synthesis
gibberellin
produced
enzymes
produced
C.
water
absorbed
gibberellin
produced
protein
synthesis
enzymes
produced
hydrolysis of
food reserves
D.
gibberellin
produced
water
absorbed
protein
synthesis
enzymes
produced
hydrolysis of
food reserves
(Total 1 mark)
4