Long Day Plants

Q.

Given below is a list of plants. Count the number of plants which have (i) endospermic and (ii) non-endospermic seeds.

Wheat, Pea, Bean, Rice, Castor, Groundnut, Coconut, Maize

1. (i) 4 and (ii) 4

2. (i) 3 and (ii) 5

3. (i) 2 and (ii) 6

4. (i) 5 and (ii) 3

Q. In short day plants, the dark period is critical and so it must be continuous for a certain period. These plants are also called as long night plants. In long day plants, the light period is critical, so it must be continuous for certain duration. These plants are also called as short night plants.

1. True

2. False

Q. Which one of the following organisms is correctly matched with its three characteristics?

1. Pea - C3 pathway, endospermic seed, veaxillary aestivation
2. Tomato - twisted aestivation, axile placentation, berry
3. Onion - Bulb, twisted aestivation, basal placentation
4. Maize- C3 pathway, 3 closed vascular bundle scutellum

Q. If a plant produces flower on exposure to alternating exposures of 4 hours light and 2 hours dark in a 24 hour cycle, it should be a:

1. Short day plant
2. Day neutral plant
3. Long short day plant
4. Long day plant

Q.

Question 18:

Classify the following plants into Long Day Plants(LDP), Short Day Plants(SDP) and Day Neutral Plants (DNP) Xanthium, henbane (Hyoscyamusniger), spinach, rice, strawberry, Bryophyllum, sunflower, tomato, maize.

Q.

Sporopollenin can protect pollen grain from adverse environmental conditions and also maintain their viability over several years.

1. True

2. False

Q. A common feature of mango, almond, and coconut is

1. fleshy mesocarp
2. edible endosperm
3. stony endocarp
4. hard seed coat

Q.

Name the two eternal factors that have a favourable effect on the egg-laying of hens.

Q. Flowering is controlled by relatively longer day length in:

1. Spinach
2. Tobacco
3. Tomato
4. Maize

Q. In short day plants, the dark period is critical and so it must be continuous for a certain period. These plants are also called as long night plants. In long day plants, the light period is critical, so it must be continuous for certain duration. These plants are also called as short night plants.

1. True
2. False

Q. Which of the following is a long day plant?

1. Mirabilis
2. Glycine max
3. Mirabilis jalapa
4. Spinacia oleracea (Spinach)

Q. Millets belong to

1. Poaceae
2. Asteraceae
3. Liliaceae
4. Fabaceae

Q. Many flowering plants use light-detecting pigments called phytochromes, which serve to trigger growth and development in response to environmental signals. This response to relative lengths of light and dark periods is known as photoperiodism, and flowering plants respond to seasonal changes in light by flowering at different times of the year.
While many flowering plants in the northern hemisphere produce flowers in the spring and summer (long day/short night plants), some plants only flower in the fall and winter (short day/long night plants).
In the 1940's research was conducted with series of controlled experiments, which involved monitoring flowering plants in light-tight boxes where the length of light and dark was manipulated. The experimental results are summarized in Figure above:
Using data from Figure, what is the question the researchers were attempting to answer?

1. Do flowering plants respond to the length of day or the length of night?
2. What triggers flowering plants to produce flowers?
3. Do short-day plants flower the same time as long-day plants?
4. How do the seasonal changes of light availability affect flowering in plants?

Q. Which of the following plant is a long day plant?

1. Onion
2. Soyabean
3. Wheat
4. Tobacco

Q. If a plant produces flowers when exposed to alternating periods of $5$ hours light and $3$ hours dark in a $24$-hour cycle, the plant should be a

1. SDP
2. LDP
3. SLDP
4. DNP

Q. Which ones are long day plants?

1. Wheat, Poppy, Soyabean
2. Wheat, Poppy, Beet
3. Wheat, Xanthium, Paddy
4. Wheat, Oat, Soyabean

Q. Assertion :A farmer does not prefer to grow tobacco plant under long day . Reason: Tobacco is a short day plant.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason are correct

Q. Flowering is controlled by relatively longer day length in:

1. Spinach
2. Tobacco
3. Tomato
4. Maize

Q. Match column I with column II and choose the correct option.

Q. Which of the given is a long day plant?

1. Spinach
2. Glycine max
3. Tobacco
4. Chrysanthemum

Q. Tendu/Kendu leaves used as wrappers for bidis are got from

1. Diospyros ebenum
2. Dipterocarpus indicus
3. Diospyros melanoxylon
   
4. Dipterocarpus tuberculatus

Q. Majority of cereal crops are members of family

1. Poaceae
2. Leguminosae
3. Cucurbitacae
4. Cruciferae

Q. Long day plants produces flowers when they are exposed to

1. Light period longer than a critical day length
2. Any duration of light
3. Light period longer than 12 hrs
4. None of the above

Q. Which one is correct for blooming of short day plants?

1. The long dark period is not critical
2. It is affected by interruption of long dark period by brief exposure to light
3. It is not affected by interruption of long dark period by brief exposure to light
4. It is affected if continuous light period is interrupted

Q. A dry indehiscent fruit is

1. Caryopsis
2. Follicle
3. Capsule
4. Pod

Q. Which one of the following belong to the same category?

1. Cashewnut, Coconut and Chestnut
2. Coconut, Orange and Tomato
3. Mango, Almond and Coconut
4. Betelnut, Chestnut and Coconut

Q. The family which yields cereals is

1. Fabaceae
2. Poaceae
3. Liliaceae
4. Asteraceae

Q. Botanical names of jowar and rice are respectively

1. Oryza sativa and Pennisetum typhoides

2. Sorghum vulgare and Oryza sativa

3. Triticum aesativum and Pennisetum typhoides

4. Oryza sativa and Sorghum vulgare

Q. A plant which needs, not less than 10 hours of light to flower is

1. Long day plant
2. Short day plant
3. Day neutral plant
4. None of the above

Q. Salad is got from

1. Helianthus tuberosus

2. Enhydra fluctuans

3. Carthamus tinctorius

4. Lactuca sativa