(a) Which enzyme has recognition sequence shown in the diagram given below? (b) What is meant by palindrome? (c) Enzyme in the given diagram cuts DNA to produce ———- ends.

(a) Enzyme is EcoRI. (b) Palindrome is a DNA sequence which when read in opposite direction (3’ to 5’ or 5’ to 3’) it reads same. (c) Enzyme in the given diagram cuts DNA to produce sticky ends.

(a) Which enzyme has recognition sequence shown in the diagram gi…

Sketch the graphs to show directional and stabilizing selection.

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Observe the diagrammatic representation of double circulation and answer the given questions.

Why the circulation shown in the above diagram is called double circulation?
What are the two main routes of double circulation?
Which blood vessels carry oxygented blood to heart and deoxygenated blood to lungs?
Which blood vessels carry deoxygented blood to heart and oxygenated blood to body organs?

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Observe the given diagram and answer the questions given below.

$(a)$ What is the name of this equipment?
$(b)$ What is the function of such equipment?
$(c)$ Explain its working in brief.

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Sketch and label, Meselson and Stahls experiment.

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Identify the type of growth curves observed in plants.

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a. Identify honey bees A, B and C in the given diagram.
b. They belong to which species?

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Observe pyramids of numbers and answer the questions below

1. In the above pyramid of numbers how many primary consumers are supporting secondary consumers? What will happen if the numbers are reversed?
2. When does pyramid of numbers get inverted in case of a single tree ecosystem ?
3. What will happen, if in the above example, we substitute larger bird of prey feeding on small insect eating birds?

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Observe the diagrams of blood cells and answer the following questions

(a) Which of the above is agranulocyte ?
(b) Describe its origin and structure.
(c) Mention its types.
(d) Explain its function.