PART - 1 - Unit III : CH - 10 Cell Cycle and Cell Division — BIOLOGY STD 11 Science — Question

Explain glycolysis.

What are the characteristic differences found in the vascular tissue of gymnosperms and angiosperms?

Halophytes may show cell pressure very much higher than atmospheric pressure. Explain how this can happen?

Write the functions of the following
i. Centromere
ii. Cell wall
iii. Smooth ER
iv. Golgi Apparatus
v. Centrioles

Explain morphology of cockroach.

Explain the theory of muscular contraction and relaxation in human beings.

Akshita who is a biology tutor was teaching photosystems to the students at her place. While explaining the topic light reaction said that, "Two of the three products of light reaction, ATP and NADPH are used to drive the reactions in the biosynthetic/dark phase." It has been verified by the fact that immediately after light becomes unavailable, the biosynthetic phase continues for some time and then stops; if light becomes available again, the process continues. Her brother, student of class XI was also listening the same and was remembering that he had listened the same from his biology teacher also. He interupped her sister and asked her to re-explain the whole process for the better understanding.

1. What are the products of light reaction?
2. Can we say that calling the biosynthetic phase, dark reaction is a misnomer? Justify.
3. Name the first stable product of photosynthesis.
4. What value you learn from this phenomenon if applied in daily life?

Given below is a diagram showing ATP synthesis during aerobic respiration, replace the symbols A, B, C, D and E by appropriate terms given in the box.


F1, Particle, Pi, 2H+, Inner mitochondrial membrane, ATP, Fo particle, ADP

Deciduous plants shed their leaves during hot summer or in autumn. This process of shedding of leaves is called abscission. Apart from physiological changes what anatomical mechanism is involved in the abscission of leaves.

Describe the nephron by making a labelled diagram.