Science
Chromosomes :
(a) carry hereditary information from parents to the next generation.
(b) are thread like structures located inside the nucleus of an animal cell.
(c) always exist in pairs in human reproductive cells.
(d) are involved in the process of cell division.
The correct statements are :
options
- (a) and (b)
- (c) and (d)
- (a), (b) and (d)
- (a) and (d)
Answer
(a), (b) and (d)
Reason — Properties of chromosomes :
- Chromosomes are thread-like structures found inside the nucleus of a cell.
- They are made up of DNA and proteins and play a vital role in carrying hereditary information from parents to offspring.
- This genetic information is passed through genes present on the chromosomes, which determine various traits in living organisms.
- Chromosomes are also actively involved during cell division, where they ensure that the genetic material is equally distributed between the daughter cells.
- In human reproductive cells such as sperms and eggs, chromosomes do not exist in pairs; they are present as a single set (haploid).
Therefore, the correct statements about chromosomes are that they carry hereditary information, are thread-like structures in the nucleus, and are involved in cell division.
Related Questions
The reaction given below is a redox reaction because in this case :
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
options
- MnO2 is oxidised and HCl is reduced.
- HCl is oxidised.
- MnO2 is reduced.
- MnO2 is reduced and HCl is oxidised.
Consider the following statements :
(a) The sex of a child is determined by what it inherits from the mother.
(b) The sex of a child is determined by what it inherits from the father.
(c) The probability of having a male child is more than that of a female child.
(d) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote.
The correct statements are:
options
- (a) and (c)
- (b) and (d)
- (c) and (d)
- (a), (c) and (d)
In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as:
options
- Axon
- Dendrites
- Neuromuscular junction
- Cell body
A stomata closes when :
(a) it needs carbon dioxide for photosynthesis.
(b) it does not need carbon dioxide for photosynthesis.
(c) water flows out of the guard cells.
(d) water flows into the guard cells.
The correct reason(s) in this process is/are:
options
- (a) only
- (a) and (c)
- (b) and (c)
- (b) and (d)