Sample Paper

Question 1. During microsporogenesis, meiosis occurs in:

a. Endothecium

b. Microspore mother cells

c. Microspore tetrads

d. Pollen grains.

Question 2. Which one of the following is not a male accessory gland?

a. Seminal vesicle

b. Ampulla

c. Prostate

d. Bulbourethral gland

Question 3. Which of the following statements is correct?

a. Surgical methods of contraception does not prevent gamete formation

b. In E. T techniques, embryos are always transferred into the uterus

c. Oral pills are very popular contraceptives among the rural women

d. All STDs are completely curable

Question 4. The synthesis of DNA is discontinuous on one strand of the replication fork because:

a. DNA molecule being synthesised is very long

b. DNA-dependent DNA polymerase catalyse polymerisation only in one direction ($5' \to 3'$)

c. It is more efficient process

d. It help to use DNA ligase

Question 5. To analyse the genotype of an organism, it is made to:

a. Self cross

b. Cross with recessive parent

c. Cross with dominant parent

d. Cross with another species

Question 6. The conditions of the earth atmosphere conducive for the origin of life were:

a. Presence of high temperature, $CH_4$, $NH_3$, and $O_3$

b. High temperature, $CH_4$, $NH_3$, volcanic eruption

c. High temperature, volcanic eruption, $O_2$, $NH_3$

d. Volcanic eruption, $CH_3$, $NH_3$ and $O_2$

Question 7. Virus-free plants can be raised in vitro from

a. Any plant part

b. Meristems of infected plants

c. Stem of infected plants

d. Leaves of infected plants

Question 8. If a radiolabel is used to tag a DNA molecule, the technique used to localise would be

a. X-ray crystallography

b. Autoradiography

c. Fluorescence microscopy

d. Electron microscopy

Question 9. An inverted Pyramid of biomass is represented by:

a. Aquatic ecosystem

b. Ecosystem of a big tree

c. Grassland ecosystem

d. Tropical fresh ecosystem

Question 10. Some of the problems that have come in the wake of green revolution are:

a. Water logging and permafrost

b. Soil erosion and desertification

c. Water logging and soil salinity

d. Snow blindness and water logging

Question 1. Right two important conditions of MTP to avoid its misuse.

Question 2. Which of the following are homologous or analogous (Indicate H for homologous and A for Analogous)

a. Wing of bat and butterfly ___________

b. Wing of bat and flipper of whale ___________

c. Wing of butterfly and flipper of whale ___________

d. Flipper of whale and wing of bird ___________

Question 3. How does incomplete dominance differ from co-dominance?

Question 4. The yellowish fluid colostrum is secreted by mother during initial days of lactation, mention the antibody present in it and mention the type of immunity.

Question 5. With the help of a suitable example mention the role of microbes in:

a. Single cell protein

b. Organic farming

Question 6. Differentiate between

a. Benign and malignant tumours

b. Viral oncogenes and protooncogenes

Question 7. Name the microbe used for production of Swiss cheese.

Question 8. How does human insulin formed using rDNA technique?

Question 9. What are selectable markers? Give two example.

Question 10. Differentiate between

a. Grazing food chain and Detritus food chain

b. Gross primary productivity and Net primary productivity

Question 11. Arrange the following steps of decomposition in a sequential order: Catabolism, Leaching, Mineralisation, Humification and Fragmentation.

Question 12. Write the appropriate method for disposals of e-waste.

Question 1. The number of taxa exhibiting asexual reproduction is drastically reduced in higher plants (angiosperms) and higher animals (vertebrates) as compared with lower groups of plants and animals. Analyse the possible reasons for this situation.

Question 2. Corpus luteum in pregnancy has a long life. However, if fertilisation does not take place, it remains active only for 10-12 days. Explain.

Question 3. Why is the frequency of red-green colour blindness is many times higher in males than in the females?

Question 4. DNA is more suitable genetic material over RNA. Why?

Question 5. A sportsperson was tested positive for cannabinoid what are these? From where are these extracted? What are its effects on human body?

Question 6. What is Bt toxin? Name an organism that produces it? How has man exploited it?

Question 7. Discuss in detail how RNA can be used to silence specific genes.

Question 1. Draw a neat, labelled diagram of a mature angiosperm, embryo sac. Mention the role of synergids.

OR

Enumerate and describe any five reasons for introducing sex education to school-going children.

Question 2. a. In humans, males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic?

b. Who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.

OR

Give an account of post transcriptional modifications of a eukaryotic mRNA with diagramatic representation.

Question 3. Observe the diagram given below and answer the following.

a. Which biome shows maximum range of annual precipitation?

b. Which biome shows maximum range of annual temperature?

c. Give range of mean annual temperature by corniferous forest

d. Give range of mean annual precipitation by temperate forest

e. Which biome has lowest mean annual temperature?

OR

Every year in winter Siberian cranes migrate from Russia to India for breeding. In the year 2006, a survey was done which has the values in the given equation $N_{(t+1)} = N_t + \{(B+I) – (D+E)\}$ as follows

$N_{(t+1)} = 1200 + \{(600+700) – (200+800)\}$

On the basis of above answer the followings

a. Natality rate

b. Mortality rate

c. Number of cranes immigrated

d. Number of cranes emigrated

e. Population of cranes in India in year 2006.