khandelwal classes ppt.pptx class 10 mcq

this is mcq of class 10 science which is most important for ccbse board exam

1. Q. The image shows a cross section of small intestine. What will likely to happen if the number of villi increases in the intestine? (a) Increases in the absorption of food (b) fast elimination of waste from the body (c) increases in flow of blood in the small intestine (d) fast breakdown of larger food particles into smaller ones

2. Q. The image shows the process of making food by a plant. which statement can be concluded from the image? (a) plants absorb CO 2 from air and H 2 O from the soil as raw materials and convert them into glucose. (b) plants absorb CO 2 from soil and H 2 O from the air as raw materials and convert them into glucose. (c) plants absorb CO 2 from air and glucose from the soil as raw materials and convert them into light energy. (d) plants absorb CO 2 from air and minerals from the soil as raw materials and convert them into heat energy.

3. Q. Observe the diagram of human digestive system and select the correct option given below. (a) A-I; B-II, III: C-IV (b) A-II; B-I; C-III, IV (c) A-II, III; B-I; C-IV (d) A-I, III; B-II, C-IV Column I (Glands) Column II (Enzymes) Salivary glands Trypsin B. Pancreas (II) Amylase C. Gastric glands (III) Pepsin (IV) Hydrochloric acid

4. Q. Plants use completely different process for excretion as compared to animals. Which one of the following process is not followed by plants for excretion? (a) They can get rid of excess water by transpiration (b) They selectively filter toxic substance through their leaves (c) waste product are restored as resins and gums in old xylem (d) They excrete waste substance into the soil around them Q. Which one among the following is not removed as a waste product from the body of a plant? (a) resins and gums (b) Urea (c) Dry leaves (d) Excess water Q. The substance that triggers the fall of mature leaves and fruits from plant is… (a) Auxin (b) Gibberellin (c) Cytokinin (d) Abscisic acid

5. Q. Dramatic changes of body features associated with puberty are mainly because of secretion of (a) Oestrogen from testes and testosterone from ovary (b) Oestrogen from adrenal gland and testosterone from pituitary gland (c) Testosterone from testes and oestrogen from ovary (d) Testosterone from thyroid gland and oestrogen from pituitary gland Q. Identify which of the following statement about thyroxin is incorrect (a) Thyroid gland requires iodine to synthesise thyroxin (b) Thyroxin is also called thyroid hormone (c) It regulates protein, carbohydrates and fat metabolism in the body (d) Iron is essential for the synthesise of thyroxin Q. During pollination, plants ensure that the pollen grain from a species germinates on the stigma of the same species which of the following ensure this? (a) hydrotropism (b) chemotropism (c) phototropism (d) geotropism

6. Q. Which of the following statements are true for flowers? (a) Flowers are always bisexual (b) They are the sexually reproductive organs (c)They are produced in all groups of plants (d) After fertilization they give rise to fruits (a) (I) and (IV) (b) (II) and (III) (c) (I) and (III) (d) (II) and (IV) Q. The diagram below shows the female reproductive system Egg Fertilisation Zygote Implantation (a) P S (b) Q S (c) R Q (d) S Q

7. Q. If a round, green-seeded pea plant ( RRyy ) is crossed with wrinkled, yellow seeded pea plant ( rrYY ), the seeds produced in F 1 generation are: (a) round and yellow (b) round and green (c) wrinkled and green (d) wrinkled and yellow Q. Select the correct statements regarding monohybrid cross between a pure tall pea plant and pure short pea plant performed by mendel : (I) All plants of F 1 generation were tall. (II) The tall plants in the F 1 generation were exactly the same as the tall plants of the parent generation. (III) One quarter of the F 2 progeny of the F 1 tall plants were short. (IV) Both the tallness and shortness traits were inherited in the F 1 plants. (a) Both (I) and (II) (b) Both (II) and (III) (c) (I), (II) and (III) (d) (I), (II) and (IV) Q. Who have a perfect pair of sex chromosomes? (a) Girls only (b) Boys only (c) Both girls and boys (d) It depends on many other factors

8. Q. A section of DNA Providing information for one protein is called: (a) Nucleus (b) Chromosomes (c) Trait (d) Gene Q. Which of the following is controlled by genes ( i ) weight of a person (ii) height of a person? (a) Only ( i ) (b) Only (ii) (c) Both ( i ) and (ii) (d) None of these Q. In an experiment with pea plants, a pure tall plant (TT) is crossed with a pure short plant ( tt ). The ratio of pure tall plant to pure short plants in F 2 generation will be (a) 1 : 3 (b) 3 : 1 (c) 1 : 1 (d) 2 : 1 Q. The two versions of a trait (character) which are brought in by the male and female gametes are situated on: (a) Copies of the same chromosome (b) Sex chromosomes (c) Two different chromosomes (d) Any chromosmes Q. Mendel conducted his famous breeding experiments by working on the following: (a) Drosophila (b) Escherichia Coli (c) Pisum Sativum (d) All of these

9. Q. Humans have two different sex chromosomes, X and Y. Based on Mendel’s laws, a male offspring will inherit which combination of chromosomes? (a) Both the X chromosomes from one of its parents (b) Both the Y chromosomes from one of its parents (c) A combination of X chromosomes from either of its parents (d) A combination of X and Y chromosomes from either of its parents Q. The manufacturing of Chlorofluorocarbons free refrigerators is mandatory throughout the world. How does this help prevent ozone depletion? a) This will help convert oxygen molecules into ozone b) This will help convert the CFCs into ozone molecules c) This will reduce the production of CFCs from oxygen molecules d) This will reduce the release of CFCs that reacts with ozone molecules Q. The driving force of any ecosystem is a) Carbohydrates b) Solar energy c) Biomass d) ATP

10. Q. Incomplete combustion of coal and petroleum: ( i ) Increases air pollution. (ii) increases the efficiency of machines (iii) reduces global warming (iv) produce poisonous gases. The correct option is: (a) ( i ) and (ii) (b) ( i ) and (iv) (c) (ii) and (iii) (d) (iii) and (iv)