List of practice Questions

Describe the events taking place during interphase.
Draw the structure of the amino acid, alanine.
Can you attempt building models of biomolecules using commercially available atomic models (Ball and Stick models).
Explain the composition of triglyceride.
Find and write down structures of 10 interesting small molecular weight biomolecules. Find if there is any industry which manufactures the compounds by isolation. Find out who are the buyers.
What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
Describe the structure of the following with the help of labelled diagrams.
(i) Nucleus
(ii) Centrosome
Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.
Draw a neat diagram of digestive system of frog.
What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.
Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem? Give reasons.
Draw illustrations to bring out the anatomical difference between (a) Monocot root and Dicot root (b) Monocot stem and Dicot stem
Describe the various types of placentations found in flowering plants.
Take one flower of the family Solanaceae and write its semi-technical description. Also draw their floral diagram.
Draw the labelled diagram of the following: 
(i) gram seed 
(ii) V.S. of maize seed
How useful is the study of the nature of body cavity and coelom in the classification of animals?
Why are the classification systems changing every now and then?
What different criteria would you choose to classify people that you meet often?
What do we learn from identification of individuals and populations?
Briefly describe the structure of the Brain.
Draw labelled diagrams of the following: 
  1. Neuron 
  2. Brain
Figure 11.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions: 
the effect of light on the rate of photosynthesis
  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?
Give comparison between the following: 
  1. C3 and C4 pathways 
  2. Cyclic and non-cyclic photophosphorylation 
  3. Anatomy of leaf in C3 and C4 plants
Explain the following processes:
  1. Polarisation of the membrane of a nerve fiber
  2. Depolarisation of the membrane of a nerve fiber
  3. Transmission of a nerve impulse across a chemical synapse.
Differentiate between: 
  1. Myelinated and non-myelinated axons 
  2. Dendrites and axons 
  3. Thalamus and Hypothalamus 
  4. Cerebrum and Cerebellum