Frank solutions for Biology [English] Class 10 ICSE chapter 2 - Structure of Chromosomes [Latest edition]

What is chromatin?

Mention the contribution of the scientist given below in the study of chromosome:

Strasburger

Mention the contribution of the scientist given below in the study of chromosome:

Balbiani

Mention the contribution of the scientist given below in the study of chromosome:

Waldeyer

Mention the contribution of the scientist given below in the study of chromosome:

Sutton and Boveri

Write a sentence of the following:
Sheath

Write a sentence of the following:
Matrix

Write a sentence of the following:
Chromonemata

Write a sentence of the following:
Centromere

Write a sentence of the following:
Secondary constriction

Write a sentence of the following:
Telomere

Fill in the blank:
DNA replicates in the ______ of the cell cycle.

Fill in the blank:
Chromatin fibre is made up of DNA and ______.

Fill in the blanks:
There are two nucleic acids ______ and ______.

Fill in the blank:
DNA acts as director of ______ synthesis.

Fill in the blank:
DNA stands are made up of, pentose sugar and four types of ______ bases.

State whether the following sentence is true or false:

Each spiral of the DNA has 12 nucleotides.

State whether the following sentence is true or false:

The two DNA chains are parallel to each other.

State whether the following sentence is true or false:

Genes are arranged in a linear order on a chromosome.

State whether the following sentence is true or false:

In any specimen of DNA, the total molar amount of A + G = T+ C.

Label the lettered parts of the given figure and answer the following questions:
(i) What does this diagram represent?
(ii) What is the importance of'd'?
(iii) What are the 'staining' properties of 'b' and 'c'?
(iv) Who gave the term used for this structure today?
(v) What is a?
(vi) Is 'e' present in all chromosomes?

Choose the correct answer:
The network of fine threads in nucleus is called __________

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The term 'chromosome' was coined by ___________

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The primary constriction contains ______________

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This structure is not present in all chromosomes ___________

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Chromosomes are thin and thread like at __________

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Thick short chromosomes can be observed at (in mitosis) ___________

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Chromosomes largely consist of _______________

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Chromosome number of man is _____________

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Telocentric chromosomes are _________________

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A 'V' shaped chromosomes has to _____________

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Sex chromosomes in man are _____________

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Sex of an individual is determined by ____________

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DNA model was given by ___________

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 Adenine is a __________

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Which of these is not present in DNA?

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RNA has uracil instead of ____________

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Spirally coiled double strands are observed in ____________