Explain what phenomena happen when the following muscles contract — (a) Flexor muscle (b) Extensor muscle (c) Abductor muscle (d) Rotator muscle

Which of the following is not an example of mutualism? (a) Man and intestinal bacteria (b) Water hyacinth and fish (c) Fish and sea anemone (d) Lichen and blue green algae

Write one feature of connective tissue.

Write one feature of epithelial tissue

"Dispersal of animals is one of the driving forces of locomotion" - Judge the statement with the help of proper examples.

The natures of Biceps, Pyriformis and Latissimus dorsi muscles respectively are: (a) Adductor, Extensor, Abductor (b) Extensor, Flexor, Rotator (c) Flexor, Rotator, Adductor (d) Rotator, Abductor, Adductor

Triceps is a flexor muscle. True or False?

How does a Rohu fish float and sink in water?

One of the driving forces of locomotion is "Aggregation for the purpose of reproductive activities"—Establish the validity of the statement with the help of two marine animals.

In DNA, which of the following base pairs is correct? (a) A—T (b) A—T (c) G = C (d) G—C

Compare the steps of mitosis in plant cells and animal cells and select which are correct: Mitosis in plant cell Mitosis in animal cell I. Spindle is formed from the cytoplasm. I. Spindle is formed from centrioles or asters. II. Cytokinesis occurs by cell plate formation. II. Cytokinesis occurs by cleavage furrow formation. III. Centrosomes are not involved. III. Centrosomes form from centrioles and are involved in mitosis. IV. Division of cytoplasm occurs through the formation of a cell plate. IV. Division of cytoplasm occurs through furrow formation. Which are correct? (a) I, IV (b) II, IV (c) II, III (d) III, IV

Which of the following statements is NOT correct? (a) Fibrin helps in blood clotting. (b) Platelets stop bleeding; many platelets reach the site of injury and begin the process of blood clotting. (c) Insulin increases the level of glucose in blood. (d) Adrenaline helps to increase heartbeat.