Sample Paper

Question 1. The term ‘systematics’ refers to:

(a) Identification and classification of plants and animals

(b) Nomenclature and identification of plants and animals

(c) Diversity of kinds of organisms and their relationship

(d) Different kinds of organisms and their classification

Question 2. Venation is a term used to describe the pattern of arrangment of

(a) Floral organs

(b) Flower in infloresence

(c) Veins and veinlets in a lamina

(d) All of them

Question 3. Interfascicular cambium and cork cambium are formed due to

(a) Cell division

(b) Cell differentiation

(c) Cell dedifferentiation

(d) Redifferentiation

Question 4. Which one of the following is not a connective tissue

(a) Bone

(b) Cartilage

(c) Blood

(d) Muscles

Question 5. Which of the following statements is true for a secretory cell?

(a) Golgi apparatus is absent

(b) Rough Endoplasmic Reticulum (RER) is easily observed in the cell

(c) Only Smooth Endoplasmic Reticulum (SER) is present

(d) Secretory granules are formed in nucleus.

Question 6. Many organic substances are negatively charged e.g., acetic acid, while others are positively charged e.g., ammonium ion. An aminoacid under certain conditions would have both positive and negative charges simultaneously in the same molecule. Such a form of aminoacid is called

(a) Positively charged form

(b) Negatively charged form

(c) Neutral form

(d) Zwitterionic form

Question 7. Mark the correct event during anaphase-I of meiosis

(a) Homologous chromosomes separate

(b) Non-homologous chromosomes separate

(c) Sister chromatids separate

(d) Non-sister chromatids separate

Question 8. The form of sugar transported through phloem is

(a) Glucose

(b) Fructose

(c) Sucrose

(d) Ribose

Question 9. Reactions carried out by $N_2$ fixing microbes include

a. $2NH_3 + 3O_2 \rightarrow 2NO_2^- + 2H^+ + 2H_2O$ (i)

b. $2NO_2^- + O_2 \rightarrow 2NO_3^-$ (ii)

Which of the following statements about these equations is not true

(a) Step (i) is carried out by Nitrosomonas or Nitrococcus

(b) Step (ii) is carried out by Nitrobacter

(c) Both steps (i) and (ii) can be called nitrification

(d) Bacteria carrying out these steps are usually photoautotrophs

Question 10. PEP is primary $CO_2$ acceptor in

(a) $C_4$ plants

(b) $C_3$ plants

(c) $C_2$ plants

(d) Both $C_3 + C_4$ plants

Question 11. Glycogen is a homopolymer made of

(a) Glucose units

(b) Galactose units

(c) Ribose units

(d) Aminoacids

Question 12. One of the common symptoms observed in people infected with Dengue fever is

(a) significant decrease in RBC count

(b) significant decrease in WBC count

(c) significant decrease in platelets count

(d) significant increase in platelets count

Question 13. Which one of the following statements is incorrect?

(a) The medullary zone of kidney is divided into a few cortical masses called medullary pyramids projecting into the calyces.

(b) Inside the kidney the cortical region extends in between the medullary pyramids as renal pelvis.

(c) Glomerulus alongwith Bowman’s capsule is called the renal corpuscle.

(d) Renal corpuscle, proximal convoluted tabule (PCT) and distal convoluted tubule (DCT) of the nephron are situated in the cortical region of kidney.

Question 14. Mary is about to face an interview. But during the first five minutes before the interview she experiences sweating, increased rate of heart beat, respiration etc. Which hormone is responsible for her restlessness?

(a) Estrogen and progesterone

(b) Oxytocin and vasopressin

(c) Adrenaline and noradrenaline

(d) Insulin and glucagon

Question 15. Suppose you accidentally find an old preserved permanent slide without a label. In your effort to identify it, you place the slide under microscope and observe the following features :-

a. Unicellular

b. Well defined nucleus

c. Biflagellate–one flagellum lying longitudinally and the other transversely.

What would you identify it as? Can you name the kingdom it belongs to?

Question 16. Identify the phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry.

Question 17. Identify the sex of a frog in which sound producing vocal sacs are present.

Question 18. What is the feature of a metacentric chromosome?

Question 19. Reaction given below is catalysed by oxidoreductase between two substrates A and A’, complete the reaction.

A reduced + A’ oxidised $\rightarrow$

Question 20. A flowering plant is planted in an earthen pot and irrigated. Urea is added to make the plant grow faster, but after some time the plant dies. Give reason.

Question 21. Identify the process occurring in II and III.

Question 22. Where is NADP reductase enzyme located in the chloroplast? What is the role of this enzyme in proton gradient development?

Question 23. Cigarette smoking causes emphysema. Suggest reasons.

Question 24. Arrange the following in the order of reception and transmission of sound wave from the external auditory canal:

Cochlear nerve, ear drum, stapes, incus, malleus, cochlea.

Question 25. The heterosporous pteridophytes show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain.

Question 26. The following events occur during the various phases of the cell cycle, Write the phase against each of the events.

a. Appearance of nucleolus _________________________

b. Division of centromere _________________________

c. Replication of DNA _________________________

Question 27. How is sulphur important for plants? Name on amino acids in which it is present.

Question 28. What is the mechanism underlying the phenomenon by which the terminal/apical bud suppresses the growth of lateral buds? Suggest measures to overcome this phenomenon.

Question 29. While eating peach or pear it is usually seen that some stone like structures get entangled in the teeth, what are these stone like structures called?

Question 30. Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic $CO_2$ requirements?

Question 31. How are the activities of gastro-intestinal tract regulated?

Question 32. The arrangement of ovules within the ovary is known as placentation. What does the term placenta refer to? Name the different types of placentation seen in plants. Draw any three types of placentation in flowers as seen in T.S.

Question 33. Give the biochemical events occurring in the root nodule of a pulse plant. What is the end product? What is its fate?

or

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves.

a. Does it indicate that the element is actively mobilized or relatively immobile?

b. Name two elements which are highly mobile and two which are relatively immobile.

c. How is the aspect of mobility of elements important to horticulture and agriculture?

Question 34. Discuss the role of $Ca^{2+}$ ions in muscle contraction. Draw neat sketches to illustrate your answer.

or

A milkman is very upset one morning as his cow refuses to give any milk. The milkman’s wife gets the calf from the shed. On fondling by the calf, the milkman got sufficient milk. Describe the role of endocrine gland and hormone associated with this response with suitable diagram.