tomorrow is my mcq test of science and i am in class 9 plz tell me the question for chapter 2,6,8,9 urgent
Answers
Explanation:
1. Tissue is a group of similar kind of cells specialized to perform a particular function in the body. Therefore presence of tissues in a multicellular organism ensures:
(a) Faster development
(b) Division of labour
(c) Higher reproductive potential
(d) Body strength
Answer: (b) Division of labour
2. Given below is a diagram showing the structure of a neuron tissue.
Choose the correct labeling for the parts A, B, C, D and E.
(a) A – Nucleus; B – Cell body; C – Dendrite; D – Axon; E – Nerve ending.
(b) A – Nucleus; B – Dendrite; C – Cell body; D – Nerve ending; E – Axon.
(c) A – Nucleus; B – Axon; C – Cell body; D – Dendrite; E –Nerve ending.
(d) A – Nucleus; B – Dendrite; C – Cell body; D – Axon; E – Nerve ending
Answer: (d) A – Nucleus; B – Dendrite; C – Cell body; D – Axon; E – Nerve ending
3. Lysosome is a cytoplasmic organelle containingenzymesthat break down biological polymers. Lysosomes function as the digestive system of the cell. It is also called the suicide bag of the cell because:
(a) It causes any cell to commit suicide
(b) Its enzymes digest the cell itself
(c) Its enzymes kill surrounding cells
(d) All of the above
Answer: (b) Its enzymes digest the cell itself
4. While doing work and running, you move your organs like hands, legs, etc. Which among the following is correct?
(a) Smooth muscles contract and pull the ligament to move the bones
(b) Smooth muscles contract and pull the tendons to move the bones
(c) Skeletal muscles contract and pull the ligament to move the bones
(d) Skeletal muscles contract and pull the tendon to move the bones
Answer: (d) Skeletal muscles contract and pull the tendon to move the bones
5. Cardiac muscleis one of the three major types of muscles, the others being skeletal and smooth muscles. It is found in the walls and histological foundation of the heart. Which one of the following statements is not related to the cardiac muscles?
(a) They muscles show rhythmic contraction and relaxation throughout life.
(b) They do not work according to our will, so they are called involuntary muscles.
(c) They are non-striated, multinucleated and branched muscles.
(d) The contraction and relaxation of the heart muscles help to pump and distribute blood to different parts of the body.
Answer: (c) They are non-striated, multinucleated and branched muscles