11.
According to which of the following models, photosynthetic reaction centre and its associated light harvesting pigment molecules of one pigment system form one photosynthetic unit?

12.
Leaf abscission is accomplished through the formation of which of the following cells, usually at the base of the petiole?

13.
Match List-I with List-II and select the correct answer:
List-I List-II
a. Strictly long-day plant 1. Trifolium repens
b. Strictly short-day plant 2. Hyoscyamus niger
c. Short-long-day plant 3. Pharbitis nil
d. Long-short-day plant 4. Bryophyllum crenatum

14.
Consider the following statements and choose the correct answer:
1. C4 plants have "Kranz" type of leaf anatomy
2. The vascular bundles in C3 leaves are surrounded by a layer of bundle sheath cells that contain large number of chloroplast
3. The chloroplast in C4 leaves are dimorphic
4. In C4 plants the cells of bundle sheath perform C4 cycle

15.
A high biological oxygen demand (BOD) indicates

18.
Consider the following statements regarding the egg (Oosphere) and choose the correct answer:
1. The oosphere contains a female generative cell
2. The upper part of the oosphere membrane is made of cellulose
3. As the maturation of the oosphere nucleus increases its stainability also increases
4. In the cytoplasm of the oosphere, apart from the nucleus certain plastids are also found which manufacture starch found in it

19.
According to chemiosmotic hypothesis, single molecule of ATP is formed from ADP and Pi (inorganic phosphate) when

20.
In which of the following dicots, the nucellus present outside the embryo sac (perisperm) is largely eaten as food?