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

What are basis of classification of Animal Kingdom? Give detail on levels of organisation.

Describe the detail structure of the human ear.

A cyclic process is occurring in C₃-plant, which is light dependent and needs O₂. This process does not produce energy rather it consumes energy.

1. Can you name the given process?
2. Is it essential for survival of the plant?
3. What are the end products of this process?
4. Where does it occur?
5. Does it occur in C₄-plants also.

A transverse section of the trunk of a tree shows concentric rings which are known as growth rings. How are these rings formed? What is the significance of these rings?

Complete the statement by choosing appropriate match among the following-

A.	Resting potential	i.	Chemicals involved in the transmission of impulses at synapses.
B.	Nerve impulse	ii.	Gap between the pre synaptic and post synaptic neurons.
C.	Synaptic cleft	iii.	Electrical potential difference across the resting neural membrane.
D.	Neurotransmitters	iv.	An electrical wave like response of a neuron to a stimulation.

Write a detailed note on the regulation of respiration.

Describe biting and chewing type of mouth parts by taking example of cockroach.

Figure shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions:

1. At which point/s (A, B or C) in the curve is light a limiting factor?
2. What could be the limiting factor/s in region A?
3. What do C and D represent on the curve?

Amit went on mountain for trekking. After reaching at about 2000 m height. He experienced difficulty in breathing. His rate of breathing increased and he decided to discontinue the trek and return back to the ground. Being concerned about his health. ls consulted his doctor friend about it? His friend explained that it is a normal phenomenon and he should have carried an oxygen cylinder while going for the trek.

1. Why is it difficult to breathe as we go up on a height?
2. Why does his friend suggested to carry an oxygen cylinder?
3. Which component of blood show its increase when someone moves from plains to higher altitudes?
4. What values are shown by Amit?

The teacher fixed five cards on the board that marked A, T, C, U, G. She asked Rakesh to pick up the card or cards that indicate bases that are not common to all nucleic acids.

1. Which card would Rakesh pick from the five?
2. Of the N-bases picked by Rakesh which does not form H bonding with other nucleic acids?
3. Name the components of nucleic acids.