Correct Answer:
(A)
Transportation of food
Phloem also called ‘bast’ tissues in plants that carry food produced in the leaves to all other parts of the plant. Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibres and phloem parenchyma cells.
Ques:
12
Consider the following statements:
Assertion (A) : Cuscuta (Amarbel) is an example of parasitic angiosperm.
Reason (R) : It gets its nutrition from the leaves of the host plant.
Choose your answer from the code given below:
(A) and (R) are true, and (R) is the correct expla nation of
(A).
Correct Answer:
(D)
Assertion (A) is true, but (R) is false.
Cuscuta is a rootless, yellow coloured plant with a slender stem which twines around the stem of the host. It is an ex- ample of parasitic angiosperm. It develops haustoria which enter the host plant forming contact with xylem and phloem of the host. It absorbs the prepared food, water and minerals from the host plant.
Ques:
13
Crop logging is a method of -
Correct Answer:
(B)
Plant analysis for assessing the requirement of nutrients for crop production
Crop-logging may be of great help to determine the adequate levels of different nutrients for good plant growth and high yield. The concept of crop-logging was developed by Clements of USA for the growing of sugarcane in Hawaii, where the fertilizer requirements of this crop are greatly influenced by weather and climate. Crop-logging is a method of plant analysis for assessing the requirement of nutrients for crop production.
Ques:
14
It happens during the photosynthesis in green plants :
Correct Answer:
(B)
Taking CO2 and releasing oxygen
Photosynthesis is the process of converting light energy to chemical energy and storing it in the bonds of sugar. In this process, carbon dioxide (CO2) is taken in from the atmosphere and oxygen (O2) is released out during the formation of | glucose (C,H,O)12
Chemical Reaction:
6CO2+6H2O+(energy) → C6H12O6+6O2Carbon dioxide, water, and energy from light produces glucose and oxygen.
Ques:
15
The radiant energy absorbed by the plants results in –
Correct Answer:
(A)
Photolysis of water
Photolysis of water is the outcome of radiant energy taken by plants in which hydrogen ions and oxygen gas are made by the breaking of H2O molecules.
Ques:
16
Artificial light can –
Correct Answer:
(C)
Bring about photosynthesis
In the process of photosynthesis, light energy changes into the chemical energy. Normally plants utilize sunlight but marine algae also use moonlight. Photosynthesis even occurs in electric light.
Ques:
17
Which one of the following energy conversions takes place in carrying out the process of photosynthesis?
Correct Answer:
(A)
Light to chemical energy
Photosynthesis is the process used by plants to convert light energy into chemical energy. Photosynthesis can be represented by using following chemical equation-
Where, CO2 = Carbon dioxide H2O = Water
C6 H12O6 = Glucose O2 = Oxygen
Ques:
18
In the process of Photosynthesis, how many molecules of A.T.P. are involved in the synthesis of each molecule of Glucose?
Correct Answer:
(B)
18
In the process of photosynthesis, 18 molecules of A.T.P., 6 molecules of CO2 and 12 molecules of NADPH are involved in the synthesis of each molecule of Glucose.
Ques:
19
Which of the three circumstances among these are most necessary in the germination of single seed plants?
Correct Answer:
(B)
Water, proper temperature, oxygen
Water, proper temperature and oxygen are the most required substances/circumstances for the germination of seed, while the sunlight is not essential. There are two types of germination of seed in plants-epigeal and hypogeal.
Ques:
20
Consider the following kinds organisms –
1. Bat 2. Bee
3. Bird
Which of the above is/are pollinating agent/agents?
Correct Answer:
(D)
1, 2 and 3
Pollination is the act of transferring pollen grains from male anther of a flower to the female stigma. It is a prerequisite for fertilization. Fertilization allows the flower to develop fruits and seeds. Bees are the most important pollinating agent. Pollination by bees and butterflies often occurs in the flowers which bloom in the day time. Hummingbird-pollinated flowers appear in warm colours like red, yellow and orange. Bat is also a pollinating agent of many flowers. However, the number of animals - pollinated flowers are not so high, some of them are found in the southern hemisphere.
