281: Which of the following plants is biennial?
(a) Banana
(b) Pineapple
(c) Jack fruit
(d) Carrot
282: Stripes on the back of the animals are the indication of:
(a) Mating habit
(b) Food habit
(c) Cave dwelling
(d) Matching of skin colour with surroundings
283: Which of the following is a balanced fertiliser for plants?
(a) Urea
(b) Ammonia sulphate
(c) Nitrates
(d) Compost
284: In making the saffron spice, which one of the following parts of the plant is used?
(a) Sepal
(b) Stigma
(c) Leaf
(d) Petal
Explanation:
Each saffron crocus flower has 3 stigmas, it takes about 80,000 flowers (2,40,000 stigmas) to make a pound of saffron. It
takes an experienced picker about 12 days to pick this many. By the time saffron gets to retail stores, its cost is $600 to over $2000 per pound.
285: Which one of the following parts of the pitcher plant becomes modified into a pitcher ?
(a) Stipule
(b) Stem
(c) Petiole
(d) Leaf
Explanation:
In 'Nepenthes' the leaf lamina' develops into the pitcher with its apex forming lid which is brightly red coloured for attracting the insects.