Plant Growth and Development - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718Plant Growth and Development - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718Which of the following is not an action of ethylene?
| 1. | Induces leaf abscission |
| 2. | Inhibits root hair growth - decreasing the efficiency of water and mineral absorption |
| 3. | Induces the growth of adventitious roots during flooding |
| 4. | Stimulates epinasty - leaf petiole grows out, leaf hangs down and curls into itself |
The formation of interfascicular cambium in plants is due to:-
1. Non-differentiation
2. Re-differentiation
3. Differentiation
4. De-differentiation
The PGR used to initiate flowering and for synchronizing fruit-set in pineapples is:
1. Abscisic acid
2. Cytokinin
3. Auxin
4. Ethylene
In most situations, which of the following acts as an antagonist to GAs?
1. ABA
2. IAA
3. Kinetin
4. Ethylene
Which of the following is the site for perception of light/dark in plants?
1. Root apex
2. Shoot apex
3. Leaves
4. Flower
A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely
1. cause increased flower production.
2. have no effect upon flowering.
3. inhibit flowering.
4. stimulate flowering.
Both red and blue light are involved in?
1. stem elongation.
2. photoperiodism.
3. positive phototropism.
4. tracking seasons.
At the root apex the cells of the meristematic region are not characterized by:-
1. Being rich in protoplasm
2. Abundant plasmodesmatal connections
3. A cell wall that is primary in nature
4. Having small inconspicuous nuclei
Primary and secondary growth are inhibited by:
1. Auxins
2. Gibberellins
3. Abscisic acid
4. Cytokinins
Fruit and leaf drop at early stages can be prevented by the application of
1. Cytokinins
2. ethylene
3. auxins
4. gibberellic acid
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 is the basis for quantitative determination of small amounts of growth-promoting substances
3. It demonstrated polar movement of auxins
4. It supports the hypothesis that IAA is auxin
During seed germination its stored food is mobilised by.
1. ethylene
2. cytokinin
3. ABA
4. gibberellin
Which one of the following is correctly matched?
1. Passive transport of nutrients - ATP
2. Apoplast - Plasmodesmata
3. Potassium - Readily mobilized
4. Bakane of rice seedlings - F Skoog
Coiling of garden pea tendrils around any support is an example of
1. thigmotaxis
2. thigmonasty
3. thigmotropism
4. thermotaxis
Which parameter is used to measure the growth in flat organs like leaves?
1. Increase in dry weight
2. Increase in cell size
3. Increase in surface area
4. Increase in length
Deposition of new materials inside the cell wall of cells starts in
1. Meristematic phase
2. Reproductive phase
3. Maturation phase
4. Elongation phase
A Leaf of 20 cm2 grows 5 cm2 per hour and B Leaf of 25 cm2 grows 5 cm2 per hour. The relative growth rate of leaf A and B respectively is
1. 25% and 20%
2. 20% and 25%
3. 50% and 100%
4. 25% and 50%
What happens to the growth of roots during water logging conditions?
1. Growth is accelerated
2. Growth is inhibited
3. Growth remains constant
4. First growth is accelerated and then stops
Which abiotic factor is not essential for early growth of the plant but growth is sustained only in its presence?
1. Water
2. Oxygen
3. Nutrients
4. Light
Tracheids do not collapse under extreme tension due to the presence of
1. Strong, elastic lignocellulosic secondary cell wall
2. Thick, cellulosic primary cell wall
3. Thin, elastic, cellulosic primary cell wall
4. Thick, hard suberised secondary cell wall
Cork, secondary cortex and secondary xylem are formed through
1. Dedifferentiation
2. Redifferentiation
3. Differentiation
4. Obliteration
Which auxins are used in diluted form to produce parthenocarpic fruits?
1. IAA and IBA
2. 2, 4-D and IBA
3. NAA and GA
4. 2, 4-D and IAA
Match the following (Column - I with Column II)
Column I Column II
a. Ethephon (i) GA
b. Terpene (ii) Ethylene
c. Zeatin (iii) Natural auxin
d. IAA (iv) Cytokinin
1. a(ii), b(i), c(iii), d(iv)
2. a(ii), b(i), c(iv), d(iii)
3. a(iv), b(ii), c(iii), d(iv)
4. a(i), b(ii), c(iii), d(iv)
Match the following (Column - I with Column II)
Column I Column II
a. Weedicide (i) GA3
b. Bolting (ii) Cytokinin
c. Thinning of cotton (iii) Ethylene
d. Lateral shoot growth (iv) 2, 4-D
1. a(iii), b(ii), c(iv), d(i)
2. a(iv), b(i), c(iii), d(ii)
3. a(iv), b(i), c(ii), d(iii)
4. a(iv), b(ii), c(iii), d(i)
Specific property attributed to GA is
1. Shortening of genetically tall plants
2. Elongation of genetically dwarf plants
3. Rooting of stem cuttings
4. Promotion of leaf and fruit fall
Cytokinins are said to be antiageing hormone because they delay the senescence by
1. Controlling mobilisation of resources
2. Controlling protein synthesis
3. Decreased morphogenesis and high respiration
4. Both (1) & (2)
Triple response is shown by hormone
1. Ethylene
2. CK
3. 2, 4-D
4. GA3
Match the following
Column I Column II
a. Auxin (i) Root hair formation
b. Cytokinin (ii) Seed development
c. Ethylene (iii) Xylem differentiation
d. ABA (iv) Nutrient mobilisation
1. a(iv), b(ii), c(iii), d(i)
2. a(ii), b(iii), c(i), d(iv)
3. a(i), b(iii), c(ii), d(iv)
4. a(iii), b(iv), c(i), d(ii)
Hypothetical 'florigen' could be produced prematurely in long day plant by exposing it to
1. Shortening light period
2. Red light during night
3. Extending dark period
4. Far red light
You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
1. IAA and gibberellin
2. Auxin and cytokinin
3. Auxin and abscisic acid
4. Gibberellin and abscisic acid
Phytochrome is a
1. Flavoprotein
2. Glycoprotein
3. Lipoprotein
4. Chromoprotein
Typical growth curve in plants is
1. Parabolic
2. Sigmoid
3. Linear
4. Stair-steps shaped
What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?
1. Auxin accumulates on the shaded side, stimulating greater cell elongation there
2. Green plants need light to perform photosynthesis
3. Green plants seek light because they are phototropic
4. Light stimulates plant cells on the lighted side to grow faster
A few normal seedings of tomato were kept in a dark room. After a few days they were found to have become whitecoloured like albinos. Which of the following terms will you use to describe them?
1. Mutated
2. Embolised
3. Etiolated
4. Defoliated
Which one of the following acids is a derivative of carotenoids?
1. Indole-3-acetic acid
2. Gibberellic acid
3. Abscisic acid
4. Indole butyric acid
“Foolish Seedling” disease of rice led to the discovery of
1. IAA
2. GA
3. ABA
4. 2, 4 – D
Opening of floral buds into flowers, is type of:
1. Autonomic movement of growth
2. Autonomic movement of locomotion
3. Autonomic movement of variation
4. Paratonic movement of growth
The wavelength of light absorbed by Pr form of phytochrome is
1. 660 nm
2. 720 nm
3. 620 nm
4. 640 nm
Treatment of seed at low temperature under moist conditions to break its dormancy is called :
1. Scarification
2. Vernalization
3. Chelation
4. Stratification
Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
1. Application of iron and magnesium to promote synthesis of chlorophyll
2. Frequent irrigation of the crop
3. Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
4. Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic
acid
The ability of the venus flytrap to capture insects is due to :
1. Chemical stimulation by the prey
2. A passive process requiring no special ability on the part of the plant
3. Specialized “muscle-like” cells
4. Rapid turgor pressure changes
2, 4-D is an effective
1. Rodenticide
2. Wormicide
3. Fungicide
4. Weedicide
Gibberellic acid induces flower
1. In short day plants under long day conditions
2. In day-neutral plants under dark conditions
3. In some gymnospermic plants only
4. In long day plants under short day conditions
Which combination of gases is suitable for fruit ripening?
1. 80% CH4 and 20% CO2
2. 80% CO2 and 20% O2
3. 80% C2H4 and 20% CO2
4. 80% CO2 and 20% CH2
One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place other set of plant?
1. Long day
2. Darkness neutral
3. Day neutral
4. Short day
A : Phytochrome, a protein, has regulatory function.
R : Various morphogenetic processes are regulated by it.
A : Auxins treatment cause acidification of cellwall and help in cell elongation.
R : Loosening of cell wall microfibrils occurs.
A : Cytokinins are anti ageing hormones.
R : They cause changes in osmotic potential by increasing the volume of mature cells.
A : Gibberellic acid increases the yield of malt from barley grain.
R : Gibberellins stimulate the synthesis of amylase, protease and other hydrolytic enzymes for mobilisation of reserve food.
A : Cytokinin along with the auxin are required for morphogenesis.
R : More cytokinin to auxin ratio promote root initiation during micropropagation.