Chemical coordination in plants — Biology STD 10 — Question

Give any four differences between photosynthesis and respiration.

Explain briefly the idea contained in the following statement. There will be increasing dependence on sources of energy other than coal and petroleum in the future.

Mention three important differences between the action of hormones and that of nerves in the regulatory mechanism of our body.

Arrange and rewrite the terms in each group in the correct order so as to be in a logical sequence beginning with the term that is underlined.
(i) Cytokinesis, telophase, anaphase, metaphase
(ii) interphase, prophase, metaphase, anaphase
(iii) G₁ phase, S phase, G₂ phase, M phase

How can we control air pollution?

What is wilting? Some plants show wilting of their leaves at noon even when the soil is well watered, Why is it so?

The figure given alongside represents the vertical section of a leaf.
(i) Name the given structure.
(ii) Give an example of two plants where this structure is present.
(iii) Which physiological process takes place through this structure?

Draw neat and labelled diagrams of a myelinated neuron

What is the effects of global warming?

The diagram shown below is the lateral section of a testis of man.
Study it carefully and answer the questions that follow:
(i) Label the parts 1 to 4 of the diagram.
(ii) State the functions of the parts labelled 1 .
(iii) State the functions of the parts labelled 2.