Cholodny Went Theory

Q. Assertion: Auxins help to prevent fruit and leaf drop at early stages.

Reason: Auxins promote the abscission of older mature leaves and fruits.

1. If both assertion and reason are true and reason is the correct explanation of assertion
2. If both assertion and reason are true but reason is not the correct explanation of assertion
3. If assertion is true but reason is false
4. If both assertion and reason are false

Q.

The portion of DNA which contains information for an entire polypeptide is called

1. Operon

2. Recon

3. Muton

4. Cistron

Q. The plant shoot cells on the shady side grow longer than the cells exposed to light because

1. plants grow in the direction of light
2. light is essential for the photosynthesis of green plants
3. accumulation of auxin on the shaded side stimulates cell elongation
4. light induces plant cells on the lighted surface to grow quicker

Q.

The terminal end of chromosome is ______ .

Q.

Is phototropism positive or negative?

Q.

Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?

1. It made possible the isolation and exact identification of auxin

2. It demonstrated polar movements of auxins

3. It is the basis for quantitative determination of small amounts of growth-promoting substances

4. It supports the hypothesis that IAA is auxin

Q.

The shoot of a plant shows negative phototropism.

1. True
2. False

Q. Auxin can be bioassayed by:

1. Lettuce hypocotyl elongation
2. Avena coleoptile curvature
3. Hydroponics
4. Potometer

Q. When a green plant is exposed to light only on one side, it bends toward the source of light as it grows because

1. green plants need light for carrying on photosynthesis
2. green plants seek light because they are phototrophic
3. light stimulates plant cells on the lighted side to grow faster
4. auxin accumulates on the shaded side stimulating greater cell elongation on that side

Q. SRY gene on Y chromosome is present in

1. heterochromatin region
2. euchromatin region
3. PAR region
4. q-arm

Q. The bending of the shoot of a plant in response to light is called :

1. geotropism
2. photonasty
3. phototropism
4. thigmotropism

Q. Cholodny-Went theory explains the differential response of root and stem to different concentrations of auxins

1. True

2. False

Q.

Which of the following processes is concerned with Cholodny-Went theory?

1. Photomorphogenesis

2. Photoperiodism

3. Phototropism

4. Photorespiration

Q. Went theory is related to

1. Hydrotropism
2. Chemotropism
3. All of the above
4. Phototropism

Q. Positive phototropism involves

1. growth of plants in the direction of light
2. increased absorption of sunlight by plant cells
3. growth of plants in the opposite direction to the sunlight
4. None of the above.

Q. What are the differences between plasmid DNA and chromosomal DNA

Q. Positive phototropism involves

1. growth of plants in the direction of light
2. increased absorption of sunlight by plant cells
3. growth of plants in the opposite direction to the sunlight
4. None of the above.

Q. The plant shoot cells on the shady side grow longer than the cells exposed to light because

1. plants grow in the direction of light
2. light is essential for the photosynthesis of green plants
3. accumulation of auxin on the shaded side stimulates cell elongation
4. light induces plant cells on the lighted surface to grow quicker

Q.

Match the column

Column 1	Column 2
Cytokinin	Leaf tendrils grow round the surface
Chemotropism	Fruit ripening
Auxin	Cell division
Thigmotropism	Apical dominance
Ethylene	Sugar on the stigma

Q. The plant shoot cells on the shady side grow longer than the cells exposed to light because

1. plants grow in the direction of light
2. light is essential for the photosynthesis of green plants
3. accumulation of auxin on the shaded side stimulates cell elongation
4. light induces plant cells on the lighted surface to grow quicker

Q. Most important part if Ti-plasmid at which desired gene is put to target into plant cell is

1. T- DNA
2. Ti-gene
3. Vir gene
4. Ori site

Q. Apical dominance in higher plants is down regulated by

1. Cytokinins
2. Enzyme activity and metabolism
3. Auxins
4. Photoperiodism

Q. Choose the correct answer from the alternatives given.
In unidirectional light auxin moves to the shady side of a stem and then the stem bends toward the light. Which step in this sequence represents transduction?

1. Curving of stein toward light
2. Sensitivity of a receptor to light
3. Auxin movement toward the shady side
4. All of the above

Q. Study the figure and answer the following. ​
(i) What is depicted in the figure?

Q. Some genes in bacteria and virus may code for more than one polypeptide, what are they called?

1. Overlapping genes
2. Split genes
3. Jumping genes
4. None of the above

Q. Organelle inheritance is a consequence of presence of gene in

1. Chloroplast and ribosomes
2. Mitochondria and ER
3. Chloroplast and mitochondria
4. Lysosomes and ribosomes

Q. State whether the following statements are true or false.
Went's experiment in 1926 with oat coleoptiles showed that agar that absorbed auxin from the tips would cause a tipless shoot to grow away from the side where he had placed. the agar, suggesting that auxin causes cells to elongate.

1. True
2. False

Q. Phototropic curvature is result of uneven distribution of

1. Auxin
2. Gibberellin
3. Phytochrome
4. Starch

Q.

Which is bigger in size – DNA or Enzymes? How do you know?

Q. Position of a gene on chromosome is called

1. Cistron
2. Nucleosome.
3. Locus
4. Factor