List of top Biology Questions

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: 

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

Distinguish between: 

1. afferent neurons and efferent neurons 
2. impulse conduction in a myelinated nerve fiber and unmyelinated nerve fiber 
3. cranial nerves and spinal nerves.

Given below is the scientific name of Mango. Identify the correctly written name. 
Mangifera Indica
Mangifera indica

Define a taxon. Give some examples of taxa at different hierarchical levels.

Can you identify the correct sequence of taxonomical categories?
(a) Species → Order → Phylum → Kingdom
(b) Genus → Species → Order → Kingdom
(c) Species → Genus → Order → Phylum

Try to collect all the currently accepted meanings for the word ‘species’. Discuss with your teacher the meaning of species in case of higher plants and animals on one hand, and bacteria on the other hand.

Define and understand the following terms: 
(i) Phylum 
(ii) Class 
(iii) Family 
(iv) Order
(v) Genus.

Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.

Discuss how classification systems have undergone several changes over a period of time?

How are viroids different from viruses?

State two economically important uses of:

1. heterotrophic bacteria
2. archaebacteria

What is the nature of cell-walls in diatoms?

Find out what do the terms ‘algal bloom’ and ‘red-tides’ signify.

Describe briefly the four major groups of Protozoa.