Chromosomes : (i) carry hereditary information from parents to the next generation. (ii) are thread like structures located inside the nucleus of an animal cell. (iii) always exist in pairs in human reproductive cells. (iv) are involved in the process of cell division. The correct statements are :
Chromosomes : (i) carry hereditary information from parents to the next generation. (ii) are thread like structures located inside the nucleus of an animal cell. (iii) always exist in pairs in human reproductive cells. (iv) are involved in the process of cell division. The correct statements are :
Options
Official answer
The correct option is (c). Statements (i), (ii), and (iv) are correct.
Marking scheme
- 1.Identification of hereditary role and location (0.5 marks)
- 2.Identification of role in cell division (0.5 marks)
Hint
Recall the difference between somatic cells and gametes regarding chromosome count.
Quick oral answer
Chromosomes are thread-like structures in the nucleus that carry genes. They are vital for cell division and ensuring that offspring inherit traits from their parents.
Common mistakes
- 1.Assuming chromosomes are always in pairs in all types of cells, including gametes.
- 2.Confusing chromosomes with the nucleus itself.
Analysis and explanation
Chromosomes are essential structures for inheritance and cell function:
- Statement (i) is correct: Chromosomes are the vehicles of heredity, carrying DNA from parents to offspring.
- Statement (ii) is correct: They are thread-like structures composed of DNA and proteins, located within the nucleus.
- Statement (iii) is incorrect: While somatic (body) cells have chromosomes in pairs (diploid), reproductive cells (gametes like sperm and egg) contain only one chromosome from each pair (haploid).
- Statement (iv) is correct: Chromosomes condense and are distributed into daughter cells during the process of cell division (mitosis and meiosis).
Interesting facts
Humans have 23 pairs of chromosomes, but a species of fern called Ophioglossum reticulatum has about 1,260 chromosomes!
Question details
Q9 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2024
- Section
- Section A
- Marks
- 1
- Type
- MCQ
- Chapter
- Heredity
- Topic
- Chromosomes
- Bloom's level
- Remembering
- Syllabus topic
- Heredity and Variation
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2024?
This question carries 1 mark in the CBSE Class 10 Science 2024 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Heredity" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Chromosomes" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2024 paper?
This is a MCQ question from Section A in the CBSE Class 10 Science 2024 paper.