Chromosomes

Q.

How many chromosome pairs are found in human cells ?

Q.

What are genes ? Where are they located in the cell?

Q. What is the function of the middle lamella in the cell wall?

1. Cementing material between two adjacent cells.
2. Performs transportation of materials.
3. Protects the cell.
4. All of the above

Q.

What is known as the unit of heredity?

Q.

Fill in the blanks :
(a) ___ consists of membranous sacs and secretes 40 types of digestive enzymes.
(b) ___ is surrounded by microtubules, located near the nucleus.
(c) Very thin flexible, living membrane which is differentially permeable, is called ___
(d) More than 1000 chromosomes are found in the nucleus of certain ___
(e) ___ are hereditary units.
(f) ___ is a plastid which stores starch.

Q. Primary constricted region of the chromosome is called centromere.

1. True
2. False

Q. Heterologous chromosomes are similar to each other in shape and organisation.

1. True
2. False

Q.

What is a chromonemata?

Q. The complete set of genetic information in an organism is known as____________.

1. Gene
2. Genome
3. Chromosome
4. Chromatin

Q.

What is genes

Q.

What's the difference between chromosomes, chromatin and chromatid.

Q.

Define homologous chromosome.

Q.

Question 51
How are chromatin, chromatid and chromosomes related to each other?

Q. In metaphase I, the spindle fibers attach to the ______.
In metaphase II, the spindle fibers attach to the ______.

1. homologous chromosomes; sister chromatids
2. sister chromatids; homologous chromosomes
3. non-homologous; homologous chromosomes
4. homologous; non-homologous chromosomes

Q.

What are the advantages of cell differentiation?

Q.

What are centrioles ? Write about their functions.

Q.

State whether the following statement is true or false.

Genes are specific sequences of bases on a chromosome.

1. True
2. False

Q.

where are genes located

Q. Rahul was working on an experiment on the cells of onion peel. While observing the cells under the microscope, he finds many cells with thin thread like structures in their nucleus known as 'A'. In few other cells there were thick conspicuous X shaped structures called 'B' and in such cells he couldn't find the nuclear membrane. What is A and B?

1. A- Chromosome, B- Chromatin Fibres
2. A- Organelles, B- Protein fibres
3. A- Chromatin Fibres, B- Chromosome
4. A- Protein Fibres, B- Organelles

Q.

Centrioles are associated with

1. DNA synthesis

2. Reproduction

3. Respiration

4. Spindle formation

Q. Which of the following statements are correct about chromosomes?

1. Chromosomes are rod like structures
2. It contains information of inherited characteristics
3. Condensed form of chromatin is known as chromosome
4. Chromosomes are only made up of DNA

Q.

Where is the genetic material located in the cell?

Q. A cell component which is visible only in cell division stages?
I would like to know the answer

Q. Identify the correct order in which genetic material is organised (largest to smallest).

1. Genome, chromosome, gene, nucleotide
2. Chromosome, genome, nucleotide, gene
3. Chromosome, gene, genome, nucleotide
4. Genome, chromosome, nucleotide, gene

Q. How many X chromosomes does a male have?

1. Zero
2. One
3. Two
4. Four

Q. Which form of cell division results in the formation of gametes?

1. Mitosis
2. Meiosis
3. Budding
4. Fragmentation

Q. How many autosomes and allosomes are present in human beings?

1. (21+2) pairs
2. (22+1) pairs
3. (19+4) pairs
4. (2+21) pairs

Q. Identify the different types of chromosomes in the given image.

1. 1. Submetacentric 2. Acrocentric 3. Telocentric 4. Metacentric
2. 1. Acrocentric 2. Telocentric 3. Metacentric 4. Submetacentric
3. 1. Telocentric 2. Metacentric 3. Sub-metacentric 4. Acrocentric
4. 1. Metacentric 2. Sub-metacentric 3. Acrocentric 4. Telocentric

Q.

Does every chromosome have the same DNA?

Q. When the cell is about to divide, chromatin material gets organised into .

1. chromosomes
2. genes
3. chromatins