Biology — Suggested Paper 3

1(i). In a human female, ovum consists of:

1(ii). The mineral ion needed for the formation of blood clot is:

1(iii). A zygote which has Y chromosome inherited from the father will develop into a:

1(iv). Xylem tissue:

1(v). Karan was standing on a high stool and cleaning the ceiling fan. He suddenly loses balance and sustains a head injury. An examination reveals that his pupils have lost the capacity to constrict in bright light. Which structure has been damaged?

1(vi). A plant cell may burst when:

1(vii). Aqueous humour is present between the:

1(viii). The process of conversion of ADP to ATP during photosynthesis:

1(ix). Gigantism and Acromegaly are due to:

1(x). The prime source of chlorofluorocarbons is:

1(xi). The main nitrogenous waste formed in the human body:

1(xii). Surgical method of sterilization in a woman involves cutting and tying of:

1(xiii). The statistical study of human population is called:

1(xiv). Centromere:

1(xv). Pericardium covers the:

2(i)(i). Identify the type of pollution.

2(i)(ii). Name one pollutant that causes the above pollution.

2(i)(iii). Mention the impact of this pollution on human health.

2(i)(iv). State one measure to control this pollution.

2(i)(v). What is a ‘Pollutant’? Explain the term.

2(ii)(a). The canal through which the testes descend down into the scrotum just before the birth of a male baby.

2(ii)(b). The part of the brain that regulates the peristaltic movement of the alimentary canal.

2(ii)(c). A structure that collects the soundwaves and conducts them through the external auditory canal.

2(ii)(d). The point of attachment of two chromatids of a chromosome.

2(ii)(e). Regulation of the opening and closing of stomata.

2(iii). Column A: (i) Biston betularia (ii) Testes (iii) Clotting of blood (iv) Stroma (v) Stomata Column B: – Calcium – balance of the body – Light independent reaction – diffusion of gases – gonad – Peppered moth – Light dependent reaction – Chlorophyll

2(iv)(i). Name the tropic movement shown in the diagram.

2(iv)(ii). Explain the tropic movement mentioned in (i).

2(iv)(iii). Label the part marked ‘A’.

2(iv)(iv). What is part A attracted to?

2(iv)(v). Give an example of a plant which shows Thigmotropism.

2(v)(i). Fibrin, Platelets, Thromboplastin, Fibrinogen, Thrombin.

2(v)(ii). Cochlea, Malleus, Pinna, Stapes, Incus.

2(v)(iii). Receptor, Spinal cord, Effector, Motor neuron, Sensory neuron.

2(v)(iv). Uterus, Parturition, Fertilisation, Gestation, Implantation.

2(v)(v). Caterpillar, Snake, Owl, Frog, Green leaves.

3(a)(i). Name the physiological process depicted in the diagram. Why was oil added to the water?

3(a)(ii). When placed in bright sunlight for four hours, what do you observe with regard to the initial and final weight of the plant? Give a suitable reason for your answer.

3(a)(iii). What happens to the level of water when this setup is placed in: 1. Humid conditions? 2. Windy conditions?

3(a)(iv). Mention any three adaptations found in plants to overcome the process mentioned in (i).

3(a)(v). Explain the term ‘Guttation’.

3(b)(i). Give the phenotype and genotype of the F1 generation. Which type of pollination has occurred to produce F1 generation?

3(b)(ii). Write the phenotypic ratio of the F2 generation.

3(b)(iii). Write the possible combinations of the gametes that can be obtained if two F1 hybrid plants are crossed.

3(b)(iv). State Mendel’s law of ‘Segregation of Gametes’.

3(b)(v). What is the scientific name of the plant which Mendel used for his experiments on inheritance?

4(i). Explain the term Excretion.

4(ii). State the difference between Nephron and Neuron.

4(iii). Mention any two objectives of Swachh Bharat Abhiyan.

4(iv). Give any two characteristic features of a Cro-Magnon man.

4(v)(a). Explain the phenotype of the offsprings of the F1 generation obtained from the initial cross.

4(v)(b). Mention the phenotypic ratio of the F2 generation offsprings.

4(v)(c). State Mendel’s Law of Independent Assortment.

5(a)(i). Name the physiological process occurring in the green plant that has kept the mouse alive.

5(a)(ii). Explain the physiological process mentioned above.

5(a)(iii). Why did the mouse die in bell jar B?

5(a)(iv). What is the significance of the process as stated in (i) for life on earth?

5(a)(v). Represent the above mentioned physiological process in the form of a chemical equation.

5(b)(i). Prostate gland

5(b)(ii). Myelin sheath

5(b)(iii). Islets of Langerhans

5(b)(iv). Semi-circular canals

5(b)(v). Eustachian tube

6(i). What is Micturition? Explain.

6(ii). What are biomedical wastes? Give an example.

6(iii). Differentiate between the functions of Urethra and Uterus.

6(v). Draw a neat, labelled diagram to show that oxygen is released during photosynthesis.

6(iv)(a). Which part of the membranous labyrinth is responsible for maintaining the body balance on the beam?

6(iv)(b). Which type of balance is maintained by the structure mentioned in (a)?

7(a)(i). Draw a well labelled diagram of the membranous labyrinth found in the inner ear.

7(a)(ii)(1). The sensory cells that help in hearing.

7(a)(ii)(2). The part that is responsible for static balance of the body.

7(a)(ii)(3). The membrane covered opening that connects the middle ear to the inner ear.

7(a)(ii)(4). The fluid present in the middle chamber of cochlea.

7(a)(ii)(5). The structure that maintains dynamic equilibrium of the body.

7(b)(i). Complete stoppage of menstrual cycle in females.

7(b)(ii). Pigment providing colour to urine.

7(b)(iii). The vein which drains the blood from the intestine to the liver.

7(b)(iv). The canal through which the testes descend into the scrotum just before the birth of a male baby.

7(b)(v). The process causing an undesirable change in the environment.

7(b)(vi). The removal of nitrogenous wastes from the body.

7(b)(vii). The repeating components of each DNA strand lengthwise.

7(b)(viii). An alteration in the genetic material that can be inherited.

7(b)(ix). The process of uptake of mineral ions against the concentration gradient using energy from the cell.

7(b)(x). Blood vessels carrying blood to the left atrium.

8(i). Explain the term ‘Population density’.

8(ii). Name the two surgical methods of population control.

8(iii). Mention two factors responsible for population explosion in India.

8(iv). Name any two resources which come under pressure due to rising population.

8(v)(a). Name the climate phenomenon for the increase in Earth’s temperature.

8(v)(b). Mention one reason for this warming.

8(v)(c). What measure can be taken to prevent this climate change?