Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
During Meiosis 1, in which stage synapsis takes place?
During cell growth, DNA synthesis takes place in:
The interference pattern is obtained with two coherent light sources of intensity ratio $n$. In the interference pattern, the ratio $\frac{I_{max}-I_{min}}{I_{max}+I_{min}}$ will be
In the 'S' phase of the cell cycle:
Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:
The oocytes of some vertebrates get arrested for years or months in:
In a mitotic cycle, the correct sequence of phases is
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and formation of X shaped structures called chiasmata. Reason (R): In oocytes of some vertebrates, diplotene can last for months or years.
A parallel beam of fast-moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?
Which one of the following never occurs during mitotic cell division?
Identify the correct statement with regard to G1 phase (Gap 1):
Select the correct sequence of events occurring during Prophase-I of Meiosis-I: (a) Synapsis of homologous chromosomes (b) Crossing over between non-sister chromatids (c) Condensation of chromatin (d) Dissolution of the synaptonemal complex (e) Terminalisation of chiasmata
Among eukaryotes, replication of DNA takes place in:
Archegoniophore is present in:
Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. The time period of rotation of the particle -
Given below is the diagram of a bacteriophage. In which one of the options, all the four parts A, B, C and D are correct?
Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom:
Which of the following statements is wrong for viroids?
Cell wall is absent in:
Which of the following is not an autoimmune disease?