Question

CCT Weekly- Science Practice
Life processes Photosynthesis
Photosynthesis is a biochemical process by which chlorophyll containing plant cells
manufacturesugars using solar energy,carbon dioxide and water. Oxygen is liberated. Most of the
photosynthesis occurs in leaves which are green in colour.
Question 1
The figure shows cross- section of a leaf.
a) Identify the structures labelled A, B, C and D
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b) Explain how the structure A is adapted to perform photosynthesis.
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Question 2
The pathway taken by a molecule of CO2 from the atmosphere to the site of photosynthesis is:
(a) Stomatal aperture, intercellular space, mesophyll cell wall, chloroplast.
(b) Stomatal aperture, epidermal cell, mesophyll cell, chloroplast.
(c) Stomatal guard cell, intercellular space, mesophyll cell membrane, chloroplast.
(d) Stomatal guard cell, intercellular space, phloem sieve tube, chloroplast. spongy mesophyll
cell,
Question 3
In a plant cell,Chlorophyll pigment is located in:
(a) chloroplast stroma
(b) endoplasmic reticulum
(c) mitochondrial matrix
(d) the thylakoid membranes inside chloroplasts2
Question 4
The graph below shows the relationship between photosynthetic rate and temperature
Which of the following statements correctly describe(s) the relationships shown on the graph?
(i) Raising the temperature increase the kinetic energy of molecules involved in the
process thereby increasing the rate of photosynthesis
(ii) At temperatures over 40oC enzymes involved in the photosynthetic process are
denatured
(iii) chlorophyll pigment loses its structural organisation.
(a) (i),(ii) and (iii)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (ii)
Question 5
The Pitcher plant traps insects and also uses atmospheric CO2 as a carbon source. Which of the
following best describes the nutrition of this organism?
(a) Autotrophic only
(b) Heterotrophic only
(c) Parasitic only
(d) Both autotrophic and heterotrophic
Created by:
Ms. Rachna Chahar, Lotus Valley International School, Sec 126 Expressway, Noida

Answer 1

Ques 1 b)

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Leaves are adapted for photosynthesis and gaseous exchange. They are adapted for photosynthesis by having a large surface area, and contain openings, called stomata to allow carbon dioxide into the leaf and oxygen out. ... The cells inside the leaf have water on their surface.

Answer 2

Answer:

Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.