The chitinous exoskeleton of arthropods is formed by the polymerization of?

1. Keratine sulphate and chondroitin sulphate

2. D-glucosamine

3. N-acetyl glucosamine

4. Lipoglycans

Filiform apparatus is a characteristic feature of?

1. Generative cell

2. nucellar embryo

3. aleurone cell

4. synergids

In angiosperms, microsporogenesis and megasporogenesis?

1. Occur in anther

2. Form gametes without further divisions

3. Involve meiosis

4. Occur in ovule

Metagenesis refers to?

Which of the following immunoglobulins constitute the largest percentage in human milk?

1. IgD

2. IgM

3. IgA

4. IgG

Destruction of the anterior horn cells of the spinal cord would result in loss of?

1. Sensory impulses

2. Voluntary motor impulses

3. Commissural impulses

4. Integrating impulses

The cutting of DNA at specific locations became possible with the discovery of?

1. Restriction enzymes

2. Probes

3. Selectable markets

4. ligases

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree: 
  

1. Autosomal dominant

2. X-linked recessive

3. Autosomal recessive

4. X-linked dominant

A colour-blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind? (consider the grandsons only through son)

1. 0.5

2. 1

3. Nil

4. 0.25

Flowers are unisexual in?

1. Pea 

2. Cucumber

3. China rose

4. Onion