Sample paper 1
Question: 1
Which photosynthetic pigment reflects yellow red light?
A. Chlorophyll A
B. Chlorophyll B
C. Carotenoid
D. Xanthophylls
E.
Phytochrome
Correct Answer: E. Phytochrome
Explanation:
Carotenoids are the photosynthetic plant pigments which reflect yellow red light. They contribute to
photosynthesis by transmitting the light energy which is absorbed from chlorophyll. They are also
known as orange photosynthetic pigment.
Question: 2
Which of the following is an example for denitrifying bacteria?
A. Nitrosomonas sp
B. Nitrobacter sp
C. Rhizobium sp
D. Pseodomonas sp
E. All of the above
Correct Answer: D. Pseodomonas sp
Explanation:
Denitrifiication is a process of reduction of nitrate to molecular nitrogen by microbial action.
Pseodomonas sp is an example of denitrifying bacteria. Nitrosomonas sp and Nitrobacter sp are
examples of nitrifying bacteria. Rhizobium sp is an example for nitrogen fixing bacteria.
Question: 3
Which of the following glands secrete the FSH hormone?
A. Islets of Langerhans
B. Anterior pituitary gland
C. Posterior pituitary gland
D. Parathyroid gland
E. Testis
Correct Answer: B. Anterior pituitary gland
Explanation:
The anterior pituitary gland secretes follicle stimulating hormone (FSH). In male, FSH stimulates
spermatogenesis and in females it stimulates the growth of ovarian follicles. Anterior pituitary gland
also secretes luteinising hormone, prolactin, thyroid stimulating hormone, adrenocorticotrophic
hormone and growth hormone.
Question: 4
Which among the following processes results in dark coloured amorphous substance during
decomposition in soil?