The immediate steps to be taken when a person suffers a heart attack are: P. Loosen the clothes Q. Make the person lie down in an airy place R. Take the person to the hospital S. Encourage conversation (a) P and Q (b) P and S (c) R and S (d) P, Q and R

Why are RBCs efficient in their functions though they lack nucleus and mitochondria?

Carbon monoxide is dangerous when inhaled in excess. Comment on the statement.

Give the biological/technical terms for the following: (a) The tropic movement wherein the tendrils of a pea plant twine around a support. (b) A defect in our eye in which some parts of the object are in focus while the other parts are blurred. (c) The type of waste generated in hospitals and pathological laboratories. (d) The surgical technique for females that can be used to prevent pregnancy. (e) The evolutionary process by which new species arise from the existing one.

Arrange the terms in each group in the correct order. Write them in a logical sequence beginning with the term that is underlined. (a) Palisade cells, Cuticle, Upper epidermis, Spongy cells. (b) Hepatic portal vein, Stomach, Hepatic vein, Liver. (c) Cyton, Dendrites, Synaptic cleft, Axon endings. (d) Insulin release, High blood sugar, Lowers blood sugar, Stimulates glucose uptake from blood. (e) Sperm duct, Seminiferous tubule, Epididymis, Efferent ducts.

Given below is the diagram of a human heart. Read the information below the diagram and fill in the blanks: The human heart pumps blood throughout the body. It is the size of a large fist. The heart is located between the lungs in the thoracic cavity. It has four chambers. The heart functions all through the lifespan of a person and is responsible for the survival of the person. The heart is enclosed by a membrane called (a) ............... . The ventricles give rise to two large blood vessels called (b) ............... and (c) ............... . The flaps of the cuspid valves are kept in position by (d) ............... . (e) ............... arteries supply oxygenated blood to the walls of the heart.

Assertion (A): Leukoderma is the biological term for blood cancer. Reason (R): An abnormal increase in the number of WBCs causes blood cancer. (a) (A) is true and (R) is false. (b) (A) is false and (R) is true. (c) Both (A) and (R) are true and (R) is the correct explanation of (A). (d) Both (A) and (R) are true and (R) is not the correct explanation of (A).

The diagram given below depicts the climate change on planet Earth. Answer the following questions: (a) Name the climatic phenomenon for the increase in Earth's temperature. (b) Mention one reason for this warming. (c) What measure can be taken to prevent this climate change?

During the ventricular systole, the atrioventricular valves (P) ............... and the semilunar valves (Q) ............... . (a) P-close and Q-open (b) P-close and Q-close (c) P-open and Q-close (d) P-open and Q-open

The diagram below depicts the human heart in one of its phases. Answer the questions that follow: (a) Which part of the heart is in the contraction phase? (b) Give a suitable reason to justify your answer in (a). (c) Distinguish between Systole and Diastole.

RBCs do not have nuclei. Discuss its advantage.

Which is the correct sequence of blood flow in the Pulmonary and Systemic circulation? (a) Right Atrium → Right Ventricle → Lungs → Left Atrium → Left Ventricle → Body tissues (b) Left Ventricle → Left Atrium → Body tissues → Right Atrium → Right Ventricle → Lungs (c) Left Ventricle → Left Atrium → Lungs → Right Ventricle → Right Atrium → Body tissues (d) Right Atrium → Right Ventricle → Body tissues → Left Atrium → Left Ventricle → Lungs