Biology — Suggested Paper 1

1(i). A sequence of DNA has 300 nitrogenous base pairs, of which 75 are Guanine. What is the number of Thymine in this sequence?

1(ii). If a person has a heart attack, what must be done immediately? P. Loosen his/her clothing Q. Make him/her lie down in an airy room R. Rush him/her to the hospital S. Engage him/her in a conversation

1(iii). Four friends P, Q, R, and S were discussing the examples of genetic disorders. The examples they quoted were as follows: P. Colour blindness and Malaria Q. Albinism and Cholera R. Haemophilia and Colour blindness S. Haemophilia and Albinism Who gave the correct examples?

1(iv). Cuticle on leaves:

1(v). Stimulation of the nerves of the sympathetic nervous system:

1(vi). When a cell is placed in a __________ solution it becomes plasmolysed.

1(vii). Adjusting the focal length of the eye lens to view objects at different distances is done by:

1(viii). The hormone that induces vigorous contractions of the uterus in a pregnant mother is:

1(ix). NADP is expanded as:

1(x). Which one of the following is a Greenhouse gas?

1(xi). The structure that stores urine temporarily is:

1(xii). Assertion (A): Seminal vesicles pour an alkaline secretion into the semen as it passes through the ureter. Reason (R): The female vagina is acidic and needs to be neutralized for sperm survival.

1(xiii). A health organisation wants to educate the rural audience about population control using visually engaging methods. Which of these would be effective? P. Posters Q. Loudspeakers R. Film shows S. Street plays

1(xiv). Sunil tried to match the tropic movements in plants with the stimulus they respond to. The tabulation is given below: P. Thigmotropism — Touch Q. Geotropism — Water R. Chemotropism — Chemicals S. Phototropism — Gravity Identify the correct pair:

1(xv). Industrial melanism was observed in:

2(i)(i). Centromere

2(i)(ii). Chordae tendinae

2(i)(iii). Thyroid gland

2(i)(iv). Ciliary body

2(i)(v). Proximal convoluted tubule

2(ii)(i). Addison’s disease, Cushing’s Syndrome, Acromegaly, Leukemia.

2(ii)(ii). Insulin, Adrenaline, Pepsin, Thyroxine.

2(ii)(iii). Axon, Dendron, Photon, Cyton.

2(ii)(iv). Chicken pox, Colour blindness, Haemophilia, Albinism.

2(ii)(v). Polythene bag, Crop residue, Animal waste, Decaying vegetable.

2(iii)(i). Name the defect shown in the diagram.

2(iii)(ii). What are the two possible reasons that cause this defect?

2(iii)(iii). Name the type of lens used to correct this defect.

2(iii)(iv). With the help of a diagram show how the defect shown above is rectified using a suitable lens.

2(iv)(i). Allele

2(iv)(ii). Diffusion

2(iv)(iii). Photolysis

2(iv)(iv). Phenotype

2(iv)(v). Population density

2(v)(i). The process of transformation of several glucose molecules into one molecule of starch.

2(v)(ii). The point of attachment of two chromatids.

2(v)(iii). The iron containing pigment in erythrocytes.

2(v)(iv). The duct which transports urine from the kidney to the urinary bladder.

2(v)(v). The part of the brain which is concerned with memory.

3(i). Define the term – Diapedesis.

3(ii). Distinguish between diabetes mellitus and diabetes insipidus (endocrine gland concerned).

3(iii). Carbon monoxide is dangerous when inhaled in excess. Comment on the statement.

3(v). Draw a neat, labelled diagram of a chloroplast.

3(iv)(a). Name the process for the release of the part labelled 1.

3(iv)(b). Write the name of the structure marked 2.

4(a)(i). How are the cytons and axons placed in the brain and the spinal cord?

4(a)(ii). Which part of the human ear gives ‘Dynamic balance’ and ‘Static balance’ to the body?

4(a)(iii). Explain how the human eye adapts itself to bright light and dim light.

4(a)(iv). What is Parthenocarpy? Give one example.

4(a)(v). Mention any two objectives of ‘Swachh Bharat Abhiyan’.

4(b)(i). Identify the system.

4(b)(ii). Label the parts marked 5 and 6.

4(b)(iii). Name the two hormones secreted by part 1.

4(b)(iv). Mention the number and the name of the part involved in fertilization and implantation from the above diagram.

4(b)(v). Mention the surgical methods of contraception in: 1. Human males 2. Human females.

5(i). Write the overall chemical equation for photosynthesis.

5(iii). Mention the two pairs of nitrogenous bases that are present in a DNA strand and pair with each other by hydrogen bonds.

5(iv). State any two disadvantages of living close to an airport.

5(v). Draw a neat, labelled diagram of an animal cell showing Metaphase with four chromosomes.

5(ii)(a). Name the phytohormone that Ramesh sprays on the plant at the time of fruiting.

5(ii)(b). These grapes are said to be seedless. What is the technical term for the formation of such fruits?

6(a)(i). Name the glands marked 1 to 4.

6(a)(ii). Name the hormone secreted by part 2. Give one important function of this hormone.

6(a)(iii). Name the endocrine part of the part numbered 3.

6(a)(iv). Why is the part labelled 1 called the master gland? Which part of the forebrain controls the gland labelled 1?

6(a)(v). Name the gland that secretes the ‘emergency hormone’.

6(b)(i). Name the apparatus.

6(b)(ii). Which phenomenon is demonstrated by this apparatus?

6(b)(iii). Explain the phenomenon mentioned in (ii) above.

6(b)(iv). State two limitations of using this apparatus.

6(b)(v). What is the importance of the air bubble in the experiment?

6(b)(vi). Name the structures in a plant through which the above process takes place.

7(a)(i). What is the state of the cell shown in the diagram?

7(a)(ii). Name the structure that acts as a selectively permeable membrane.

7(a)(iii). Label the parts numbered 1 to 4 in the diagram.

7(a)(iv). How can the above cell be brought back to its original condition? Mention the scientific term for the recovery of the cell.

7(a)(v). State any two features of the above plant cell which is not present in animal cells.

7(b)(i). Name the kind of pollution.

7(b)(ii). List any three common sources of this pollution.

7(b)(iii). Mention three harmful effects of this pollution on human health.

7(b)(iv). Explain the term ‘Pollutant’.

7(b)(v). Name two soil pollutants.

8(a)(i). Identify the system.

8(a)(ii). Label the parts marked 2 and 4. Mention the function of part 5.

8(a)(iii). Name the structural and functional units of the part marked 1.

8(a)(iv). What is the fluid that accumulates in part 3? Which is the main nitrogenous waste present in it?

8(a)(v). Draw a neat, labelled diagram showing the longitudinal section of part 1.

8(b)(i). Identify the endocrine gland. Where is it located?

8(b)(ii). Why is the above gland referred to as the ‘Master gland’?

8(b)(iii). Name the hormone which in deficiency causes Diabetes Insipidus. How does this disorder differ from Diabetes Mellitus?

8(b)(iv). Explain the term ‘Hormone’. What is the role of Tropic hormones in the human body?

8(b)(v). Which lobe of the above gland secretes: 1. Oxytocin 2. ACTH 3. Growth hormone