Tag: plant growth and development
Questions Related to plant growth and development
Which of the following statements regarding photoperiodism is false?
-
The response of plants to periods of light/day is termed as photoperiodism
-
The shoot apices cannot perceive photoperiods
-
In day neutral plants there is no correlation between exposure to light duration and induction of flowering response
-
Shoot apices modify themselves into flowering apices prior to flowering
-
The site of perception of light/dark duration is the flower
Which is incorrect statement?
-
There are no mesodermal cells in pseudocoelomates
-
There is no body cavity in first triploblastic animals
-
There is no second opening in diploblastic animal gut
-
There is no co-ordination between cells of sponges
Animals have a pseudocoelom that means “false cavity”, which is a fluid-filled body cavity. Tissue derived from mesoderm partly lines the fluid-filled body cavity of these animals. It is mainly found in Nematoda.
Seeds of winter varieties are benefitted by technique
-
Senescence
-
Photoperiodism
-
Vernalisation
-
Abscission
Vernalisation is the phenomena in which flowering is induced in the plant by exposing it to low temperatures. Seeds of winter varieties will flower only when they are exposed to cold period early in their development. Artificially, flowering can be induced in spring as well if they are exposed to artificial vernalization.
Vernalisation is seen in
-
Sugarbeet
-
Carrot
-
Cabbage
-
All the above
Vernalization is the process by which plant can be induced to flower by exposing it to prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low-temperature treatment to young plants or moistened seeds. Sugarbeet, carrot are biennial plants that require vernalization for flowering.
The stimulus of cold treatment (vernalisation) is perceived by
-
Leaves
-
Flowers
-
Roots
-
Shoot apices
Apple requires a low temperature for flowering and fruiting
-
10$^o$ C
-
7$^o$ C
-
Below 7$^o$ C
-
10$^o$ - 15$^o$ C
Apple grows in low temperature for germination it needs more time as earlier stages are less tolerant to low temperature but flowering starts at the temperature which is around 7 degree or below it that means it needs extreme cold climate to grow.
The term 'Yarovization' was coined by
-
Lysenko
-
Klebs
-
Yabuta
-
Kogl and Haagen-Smit
Yarovization is the process by which plant can be induced to flower by exposing it to the prolonged cold of winter. After this, plants show flowering. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Other terms like vernalization, jarovization, springification were also coined for the same phenomenon. However, today the most accepted term is vernalization.
Potato is _________ for flower formation but _________ for tuberisation.
-
LDP, SDP
-
SDP, LDP
-
LDP, day neutral
-
SDP, day neutral
In the case of potato, it requires more photoperiod to induce flowering. Whereas for the formation of tuber, it requires very less photoperiod. Thus, it is told that potato is LDP for inducing flowering; but SDP for tuber formation. The flower-inducing florigen and tuber-inducing tuberigen signals are functionally exchangeable. Flowering and tuberization are distinct reproduction strategies, both of which involve the sensing of the photoperiod and generation of a signal in the leaves (process called as induction), the subsequent transport of the signal (known as florigen or tuberigen), and the response in a distant organ, the vegetative meristem, or stolon tips (also called evocation).
Cabbage is a biennial plant which produces flowers in the second year of growth. In an attempt to make it flower in a single year, four potted plants (I, II, III, and IV) of cabbage were subjected to different temperatures for several days given in the table.
Potted plant | Temperature |
---|---|
I | $5^o C$ |
II | $20^o C$ |
III | $30^o C$ |
IV | $25^o C$ |
Which potted plant will show flowering?
-
I
-
II
-
III
-
IV
Biennials get changed into annuals by
-
Hormones
-
Photoperiodism
-
Grafting
-
Vernalisation