7/30/2019 01002_18_botany1

1/3

Higher Secondary Model Examination 2010

G.G.H.S.S. Cotton Hill

HSE - II Max Score : 30

Time : 1 Hr.

BOTANY

1. Observe the relationship of the first two and fill in the blanks.

a. Radicle : coleorrhiza

Plumule : .........................

b. Sponge : gemmules

Hydra : ......................... ( + = 1)

3.

External level

Observe the graphical representation of organismic response and name

a & b.

(1)

2. The impact of certain factors upon population Density (N) is given int he

following diagram. Fill the empty boxes.

( + = 1)

PopulationDensity (N)

Emigration (E)

PopulationDensity (N)

Natality b

a

Regulators

Internallevel

(b)

(a)

7/30/2019 01002_18_botany1

2/3

4. Partially decomposed organic matter earthworm hen fox. Name the

above mentioned food chain. How do the members in this food chain meet

their energy and nutrient requirements? (1)

5. From the evolutionary point of view cross pollination is better than self

pollination. So nature itself has developed so many devices to prevent self

pollination. Mention any three such devices. (1)

6. Write technical terms for the following

(a) morphologically different types of gametes

(b) process of formation of male and female gametes.

(c) Formation of new organisms without fertilization. (1)

7. Now a days Bt Brinjal has been much in the news. Being a GM Food is it

advantageous or disadvantageous. List out any two points each. (2)

8. PCR is meant for making multiple copies of a gene of interest. Mention the

major steps involved in PCR. Name an organism form which a thermostable

DNA polymerase is isolated. (2)

9. Match the following

A B C

Name of Interaction Type of Examples

Interaction

a) Mutualism + -- Cuscutta

b) Competition ++ Vanda

c) Pararitism + O Flemingoes & fisher

d) Commensalism -- -- lichen (2)

10 Restriction enzymes and ligases opened the doorway for recembinant DNA

technology. Do you agree with this. Justify. (2)

11. The existence of human beings is under great threat due to the uncontrolled

emission of green house gases. Can you suggest any two remedial measures

to reduce this. (2)

12. Transgenic animals are said to be beneficial to humans. Justify this statements

by giving two reasons. (2)

7/30/2019 01002_18_botany1

3/3

13. Some years back large scale death of fishes occurred due to algal bloom.

What may be the reason for such an algal bloom and for the death of

fishes. (2)

14. Different stages of an ecological succession are given below. Arrange them

in the correct sequence.

A) a. marsh - meadow stage

b. Reed swamp stage

c. Scrub stage

d. phyto plankton stage

e. submerged free floating stage

f. forest stage

B) Name the type of ecological succession and mention the pioneer and

climax communities in this succession. (3)

15. In Angiosperms, the zygote is diploid while the endosperm in triploid. Discuss

the events leading to the formation of diploid zygote and triploid

endosperm. (3)

16. One of the aims of plant breeding is to produce high yielding, disease resistantcrop plants. Describe the main steps in plant breeding. Name the variety of

bhindi which is resistant to yellow mosaic virus. (3)