Biology Practice Sets for SSC, Rail, UPSC, WBCS Exam P7

<< Prev BIOLOGYNext >>

---

Page 7

142061. A short day plant has a critical day length of 14 hours. It will flower when the day length is

A

12 hours

B

16 hours

C

15 hours

D

18 hours

A

Correct Answer: A. 12 hours

144462. One turn of DNA helix measures

A

24A°

B

44A°

C

34A°

D

3.4A°

C

Correct Answer: C. 34A°

139763. The lowest rate of photosynthesis takes place in

A

Greenlight

B

Red light

C

Blue light

D

Orange light

A

Correct Answer: A. Greenlight

136564. Which one of the following is not a hereditary disease in a man?

A

Alzheimer's disease

B

Down's Syndrome

C

Haemophilia

D

Colour blindness

A

Correct Answer: A. Alzheimer's disease

144565. The tasar silk fiber is produced by

A

Philosomia ricini

B

Antheraea assamensis

C

Antheraea mylitta

D

Bombyx mor

C

Correct Answer: C. Antheraea mylitta

135466. The largest reservoir of Nitrogen on Earth is

A

Ocean

B

Rock

C

Soil

D

Air

D

Correct Answer: D. Air

133667. Which part of the ear maintains the balance of our body?

A

Tympanic membrane

B

Cochlea

C

Otolith

D

Malleus

C

Correct Answer: C. Otolith

130468. AIDS is

A

Genetical disease

B

Bacterial disease

C

Viral disease

D

Fungal disease

C

Correct Answer: C. Viral disease

143969. Succinic acid dehydrogenase to give

A

Iso-citric acid

B

Fumaric acid

C

Malic acid

D

Formic acid

B

Correct Answer: B. Fumaric acid

132570. Which one of the four following substances contributes most to the causation of the greenhouse effect in nature?

A

Carbon monoxide

B

Sulfur dioxide

C

Carbon dioxide

D

Hydrogen fluoride

C

Correct Answer: C. Carbon dioxide

---

<< Prev BIOLOGYNext >>