SCIENCE REPORTER, SEPTEMBER 2014 56

DHANANJOY SINGH & NISHU MITTAL

TEST

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1. In the process of diff usion movement of molecules is from: a) Lower to higher concentra� onb) Higher to lower concentra� onc) Either lower to higher or higher to lower concentra� ond) None of these

2. Proteins called porins form pores in the membrane to allow molecule to pass through it, so do we call the channel that passes water through it? a) Pumps b) Water channel body c) Aquaporins d) Aquapore

3. What is the meaning of ac! ve transport? a) Movement is always ac� ve b) For ac� va� on it uses energy c) It uses energy to pump molecule against a concentra� on

gradient d) It uses sunlight for ac� va� on of transporta� on process

4. The symbol Psi is used for what? a) Water poten� al b) Solute poten� al c) Thermal poten� al d) None of these

5. In plant cell vacuoles are present, the membrane of the vacuole is called: a) Plasma membrane b) Cell membrane c) Tonoplast d) Leucoplast

6. What is osmo! c pressure? a) Pressure applied to the process of osmosis b) Pressure acquired to prevent osmosis c) Applied external pressure to cause osmosis d) When both sides are equal in concentra� on and pressure

applies on both sides

7. What happens if a plant cell is placed in water (hypotonic) solu! on? a) Cell remains same b) Cell shrinks c) Cell swells d) Cell dies

8. What happens if a plant cell is placed in sugar solu! on (hypertonic)? a) Cell shrinksb) Cell dies c) Cell increases its ac� vity d) Cell decreases its ac� vity

9. Which is an example of imbibi! ons? a) Movement of water across plant roof b) Water movement through xylem from roots to leaves c) Germina� on of seeds in water soaked condi� on d) Absorp� on of water by seeds and dry wood

10. The higher plants have highly specialised vascular ! ssues called: a) Xylem and phloem b) Wood parenchyma c) Cambium d) None of these

11. What is the main func! on of Xylem? a) Transport of air to various plant cells b) Produc� on of food in plant c) Transloca� on of water and mineral salts d) Transloca� on of inorganic compound from leaves to other

parts of the plants

12. What is the main func! on of Phloem? a) Transloca� on of water and mineral salts b) Transloca� on of organic compounds from the leaves to other

parts of the plantsc) Transport of water from one part to the other part d) No func� on is known

13. In plants the neighbouring cells are connected through: a) Cortex b) Plasmodesmata c) Cytoplasm d) Plasma membrane

14. How much water is used for photosynthesis and plant growth among total water reaching the leaves? a) 100% b) 50% c) Less than 1% d) More than 1%

15. Transpira! on is mainly through the: a) Stomata b) Leaves c) Bark d) All of the above

16. What is the immediate cause of opening or closing of stomata? a) Water fl ow through it b) Change in turgor pressure within the guard cells c) Change in porosity of guard cells d) All of the above

17. Which one is true? a) The direc� on of movement in the phloem can be upward or

downward i.e. bidirec� onal b) In Xylem the direc� on of movement is always unidirec� onal

i.e. upward c) Sugars, hormones and amino acids are transported or

translocated through phloem d) All of the above

ANSWERS: 1. b 2.c 3.c 4.a 5.c 6. b 7.c 8.a 9.d 10.a 11.c 12.b 13.b 14.c 15.a 16.b 17.d

Contributed by Dhananjoy Singh & Nishu Mittal, Department of Biotechnology, IIT Roorkee. Address: Sarojini Bhawan, Room No S-67, Indian Institute of Technology, Roorkee-247667, Uttrakhand

SCIENCE REPORTER, SEPTEMBER 201457

TEST YOUR KNOWLEDGE

SAMIT DUTTA ROY

1. Branch of botany dealing with distribu! on of plants on earth’s surface is called: a) Phytogeography b) Phytosociology c) Ecology d) Phytology

2. Synecology is the study of: a) Environment b) Individual study c) Communi� es d) None of these

3. Plants that grow in cold areas are: a) Psammophytes b) Oxylophytes c) Psychrophytes d) Halophytes

4. Endemic plants are those which are: a) Gregarious in habit b) Cosmopolitan in distribu� on c) Restricted to a certain area d) Found in arc� c region

5 Species that occur in diff erent geographical regions separated by special barriers are: a) Sympatric b) Allogenic c) Allopatric d) Autogeni

6. Transi! on zone between two vegeta! onal types of vegeta! on regions is known as: a) Ecoline b) Ecotone c) Ecotype d) Ecosystem

7. Plants are killed in winter by frost: a) Because no photosynthesis takes place at such low

temperatureb) Because respira� on ceases at such low temperature c) Because there is no transpira� on d) Because of desicca� on and mechanical damage to the � ssues

8. Biosphere is: a) In which individuals interact with each other b) Organic compound by which life diminishes c) In which life originated d) Is the name of a forest

9. In grassland ecosystem the pyramid energy is: a) Inverted b) Upright c) Inverted & upright d) None of the above

10. Green plants are very important because: a) They help the earth to keep cool and green b) They help to give shade c) They are producers d) Without them there would be no rainfall

11. Graphic representa! on of rela! onship between the producer and the consumer in an ecosystem is known asa) Ecological niche b) Ecological pyramid c) Ecological system d) Trophic levels

12. If phytoplanktons are destroyed in the sea then: a) Algae will get more space to grow b) Primary consumers will grow luxuriantly c) It will aff ect the food chain d) No eff ect will be seen

13. Reduced leaves and sunken stomata are the characteris! c feature of: a) Epiphytes b) Hydrophytesc) Mesophytes d) Xerophytes

14. An American plant which has become a troublesome aqua! c weed in India is: a) Cyperus rotundus b) Eichhornia crassipes c) Typha la� folia d) Typha bispinosa

15. Among the following which plant is completely devoid of roots? a) Hydrilla b) Vallisneria c) Azolla d) Ceratophyllum

16. Increasing accumula! on of DDT in organisms of a food chain at higher trophic level is known as: a) Biological value b) Biological amplifi ca� on c) Bio� c poten� al d) Bio� c value

17. There is no life on Moon because there is no: a) Oxygen b) Water c) Carbon d) Nitrogen

18. Vegeta! on of any place is presently determined by: a) Amount of light b) Rainfall c) Amount of soil water d) Soil type

19. Which of the following is the best indicator of SO2 pollu! on? a) Pinus b) Fern c) Algae d) Lichen

20. A fer! le soil is likely to have a pH value of: a) 3-4 b) 8-9c) 6-7 d) 10-11 ANSWERS: 1. a 2.c 3.c 4.c 5.c 6. b 7.d 8.a 9.b 10.c 11. b 12.c 13.d 14.b 15.d 16. b 17.b 18.b 19.d 20.c

Contributed by Dr Samit Dutta Roy, Associate Professor, Department of Botany, Garhbeta College, P.O. Garhbeta, Dist Paschim Medinipore, West Bengal-721127