Biology
The diagram below is an experiment conducted to study a factor necessary for Photosynthesis. Observe the diagrams and then answer the following questions:
(i) What is the aim of the experiment?
(ii) Name the test performed on the leaf and the solution used for the test.
(iii) What type of leaf was used for the experiment? Give an example.
(iv) What is the expected result of the above test on the parts labelled A and B?
(v) Give a balanced chemical equation to represent the process of Photosynthesis.
Photosynthesis
ICSE 2012
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Answer
(i) To show that chlorophyll is necessary for photosynthesis.
(ii) Starch test. Solution used in Iodine solution.
(iii) Variegated leaf / Coleus leaf (leaf having non green and green regions).
(iv) After performing starch test, Part A turns brown whereas Part B turns blue black. This is because only Part B which was green had starch produced by photosynthesis due to the presence of chlorophyll. The result proves that chlorophyll is necessary for photosynthesis.
(v) Balanced chemical equation representing the process of photosynthesis is given below:
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Related Questions
Study the diagram given below and then answer the questions that follow:
(i) Name the part labelled A. Name any two hormones produced by the part labelled A.
(ii) What happens to the part labelled B:
- If fertilisation takes place?
- If fertilisation does not take place?
(iii) Where does fertilisation occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts:
- Acrosome
- Mitochondria
A homozygous plant having round (R) and yellow (Y) seed is crossed with homozygous plant having wrinkled (r) and green (y) seeds :
(i) Give the scientific name of the plant on which Mendel conducted his hybridization experiments.
(ii) Give the genotype of the F1 generation.
(iii) Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation are crossed.
(iv) Name and state the law which explains the dihybrid ratio.
(v) Give the possible combinations of gametes that can be obtained from F1 hybrid.
The diagram given below show the cross section of two kinds of blood vessels:
(i) Identify the blood vessels A and B. In each case give a reason to support your answer.
(ii) Name the parts numbered 1 and 2.
(iii) When are the sound "LUBB" and "DUP" produced during a heartbeat?
(iv) Name the blood vessel that:
- begins and ends in capillaries
- supplies blood to the walls of the heart.
Answer the following:
(i) Draw a well labelled diagram of a 'Neuron' and name the following parts
- Node of Ranvier
- Nissil granules
- Cyton
(ii) Name the part of the human brain which is concerned with the following :
- Seat of memory
- Coordinates muscular activity
(iii) Mention any three major activities of the WHO.