The 1st CO₂ fixation product of C₄ plant is

• Oxaloacetic acid

• ribulose biphosphate

• phosphoenolpyruvate

• phosphoglyceric acid.

Which of the following genera is associated with coralloid roots?

• Cycas

• Taxus

• Pinus

• Sequoia

Cholesterol is a precursor for each of the following except

• bile salts

• vitamin D

• insulin

• steroids

Match the following and select correct option.

  Column1        Column2

A. Pteris           1) Gymnosperm

B. Cycas           2) Bryophyte

C. Sphagnum    3) Algae

D. Sargassum   4) Pteridophyta

• A-(4), B-(2), C-(1), D-(3)

• A-(4), B-(1), C-(2), D-(3)

• A-(2), B-(3), C-(4), D-(1)

• A-(1), B-(4), C-(3), D-(2)

Which of the following groups of algae produces algin?

• Phaeophyceae and Chlorophyceae

• Rhodophyceae and Phaeophyceae

• Chlorophyceae and Rhodophyceae

• Phaeophyceae only

Mature RBCs lose their ability for

• DNA replication

• Anaerobic respiration

• Aerobic respiration and DNA replication

• Aerobic respiration, DNA replication and RNA synthesising machinery

Which one of the following is an incorrect combination

• Adenine, thymine, cytidine

• Adenine, cytosine, thymine

• Guanine, thymine, uracil

• Cytosine, uracil, guanine

8.

Hiccups can be best described as

• forceful sudden expiration

• forceful contraction of intercostal muscles during deep breathing

• vibration of the soft palate during breathing while sleeping

• jerky incomplete inspiration.

Which part of the nephrons is impermeable to water

• Proximal convoluted tubule

• Distal convoluted tubule

• Ascending limb of loop of Henle

• Descending limb of loop of Henle

Gonadotropin releasing hormone is transferred to anterior pituitary by

• left coronary artery

• hypophysial portal veins

• axons of neurosecretory cells

• nuclei of hypothalamus