SESSION 2021-22
SAMPLE PAPER
CLASS – XI SUBJECT: BIOLOGY
MAX. MARKS: 35 TIME ALLOWED: 2 HOURS
General Instructions:
i) All questions are compulsory.
ii) The question paper has three sections and 13 questions. All questions are compulsory.
iii) Section – A has 6 questions of 2 marks each; Section- B has 6 questions of 3 marks each; Section- C has a case study-based question of 5 marks.
iv) There is no overall choice. However, internal choice has been provided in some questions. A student has to attempt only one of the alternatives in such questions.
v) Wherever necessary, neat and properly labelled diagram should be drawn.
SECTION – A
1. A vegetative cell of a plant undergoes equational division and produces 128 daughter cells, Calculate the number of Mitotic cycles had the original single cell undergoes.
OR
How does cytokinesis of plant and animal cell differ from each other?
2. Name the plant growth hormones which are specific to perform following roles-a- Bolting (internode elongation just prior to flowering).
b- The apical bud supresses the growth of lateral buds.
3. a- How does function of RUBISCO enzyme affected by concentration of O2 and CO2?
b- Mention the process in which Oxygen is evolved during light reaction of photosynthesis.
4. During oxidative phosphorylation in mitochondria how many NADH + H+ and FADH2 are produced?
OR
Write the steps of Glycolysis where –
a- ATP is consumed
b- ATP is formed
5. In muscles some actin and myosin are main filamentous proteins which carries out muscle contraction. Identify any two from the given diagram-
6. Explain resting potential (Polarization state) of a neuron.
SECTION B
7. Chemiosmotic hypothesis during photophosphorylation is based on concentration gradient of H+ ion. Explain the process of formation of such gradient in chloroplast.
8. Identify the stages of Meiotic – I cell division in which following events occur-
a- Synapsis formation
b- Formation of recombinant nodule
c- Termination of Chiasmata
9. Expand ECG and give diagrammatic representation of ECG. Also illustrate the meaning of any two peak/ waves obtained during ECG.
10.
In the above diagram, comment on the functioning of A, B and C.
11. What changes occur to cytoplasmic Pyruvate under following conditions-
a- Anaerobic condition in muscle cells
b- Anaerobic condition in presence of yeast
c- Aerobic condition
12. What are different mode of excretion in animals. Give one example of each.
OR
Fill the A, B, C, D, E spaces by appropriate answer: –
SECTION C
13. Read the paragraph and answer the questions: –
The hormone is distributed in blood and binds to distant target cells. These chemical messengers control various functions like metabolism, reproduction, growth etc. the hormones may be of various types-
Protein hormones (e.g., insulin, glucagon), Steroids (e.g., cortisol, testosterone) etc.
Some secondary messengers also help in mechanism of action of hormones.
Hormone secretion is regulated by signals from the nervous system, chemical changes in the blood, and effect of other hormones.
(a) Endocrine action: the hormone is distributed in blood and binds to distant target cells.
(b) Paracrine action: the hormone acts locally by diffusing from its source to target cells in the neighbourhood.
(c) Autocrine action: the hormone acts on the same cell that produced it.
a- Diagrammatically represent the mechanism of action of peptide hormone (FSH).
b- Write any two differences between mechanism of action of protein and steroid hormones.
OR
Your pituitary gland is about the size of a pea and is situated in a bony hollow, just behind the bridge of your nose. It is attached to the base of your brain by a thin stalk. The pituitary gland is often called the master gland because it controls several other hormone glands in your body, including the thyroid and adrenals, the ovaries and testicles. Together, the hypothalamus and pituitary tell the other endocrine glands in your body to make the hormones that affect and protect every aspect of your health. The pars distalis, pars intermedia and Pars nervosa are various parts of pituitary gland.
Answer the following questions-
a- What is role of LH and FSH in human female?
b- What is pituitary dwarfism? Which hormone is responsible for this?
c- Which pituitary hormone acts on Kidney? Also mention the role of that hormone.