In C₄ plants, CO, fixation is done by

• mesophyll cells

• guard cells

• sclerenchyma

• chlorenchyma and hypodermis

What will be the number of Calvin cycles to generate one molecule of hexose?

• 4

• 6

• 8

• 9

Lampbrush chromosomes are seen in which typical stage

• mitotic anaphase

• mitotic prophase

• mitotic metaphase

• meiotic prophase

The chemical knifes of DNA are

• polymerases

• ligases

• endonucleases

• amylases

Which of the following products are obtained by anaerobic respiration from yeast?

• Alcohols

• CO₂

• Beer and Wine

• All of the above

The ornithine cycle removes two waste products from the blood in liver. These products are

• CO₂ and urea

• ammonia and urea

• CO₂ and ammonia

• ammonia and uric acid

CO is a pollutant because

• it reacts with O₂

• it inhibits glycolysis

• it reacts with haemoglobin

• it makes nervous system inactive

2n - 1 condition is called

• trisomy

• monosomy

• nullisomy

• tetrasomy

Benthoic animals are those, which

• are deep dweller in sea

• are floating (free) organisms

• are submerged in sea

• float on the sea surface

Protein deficiency disease is

• eczema

• cirrhosis

• kwashiorkor

• night blindness