Consider the following statements regarding prophase I and choose the correct answer:
1. Progressive condensation and coiling of chromatin fibres occur at Leptonema stage
2. Two homologous chromosomes each derived from one parent during sexual reproduction come together and form pairs during Zygonema stage
3. Crossing over takes place during Diplonema stage
4. The nucleolus and nuclear envelope disappear and a spindle begins to be formed at the end of Diakinesis stage
Consider the following statements regarding the functions of Golgi complex and choose the correct answer:
1. Synthesizes and secretes polysaccharides
2. Takes part in sulphate metabolism (Sulphation)
3. Synthesizes ATP to produce energy for the cell
4. Takes part in the formation of primary Iysosomes
Consider the following statemens.
1. Endoplasmic Reticulum (ER) is called as 'skeleton of cell'.
2. ER is divided into three types according to presence or absence of ribosome
3. Smooth ER is rich in actively protein secreting cells.
Which of the statemen(s) given above is/are correct?
Which of the following statements are correct regarding common differences between plant and animal cells?
1. Plant cells have cellulose cell wall, while animal cells lack it.
2. Plant cells lack plasma membrane, while animal cells have it.
3. Mature plant cell have a large vacuole, while animal cells have numerous small vacuoles.