Agriculture - Online Test
Q1. Identify the part of nodule marked X
Answer : Option B
Explaination / Solution:
The figure shown above is the nodule formation in leguminous roots. The part marked as ‘x’ shown is figure is infection thread through which Rhizobium enters the root.
Q2. Thallus of Riccia is
Answer : Option D
Explaination / Solution:
Riccia is a genus of liverworts in the order Marchantiales. In bryophytes, plant body is generally haploid (n) that alternate with diploid form for shorter period. The thallus of Riccia is Halploid.
Q3. Which wavelength is inactive in PS I
Answer : Option B
Explaination / Solution:
Photosystem are light reactive centre to capture solar energy. Photosystem I is active below the wavelength of light below 780 nm. While photsystem II is active above 780 nm.
Q4. Crossing over brings
Answer : Option C
Explaination / Solution:
Crossing over brings recombination or new combination of genes and hence variations. It occurs during cell division in prophase stage of meiosis-I.
Q5. The cytochrome c moves in between
Answer : Option D
Explaination / Solution:
Cytochrome c is a small protein attached to the outer surface of the inner membrane and acts as a mobile carrier for transfer of electrons between complex III and IV.
Q6. Bat is member of order
Answer : Option B
Explaination / Solution:
Bat is a member of order Chiroptera of class Mammalia. Bats are only mammals to have achieved powered fight in which forelimb is modified as wings.
Q7. The shape of guard cells in grasses is
Answer : Option B
Explaination / Solution:
Dumb-bell-shaped guard cells are found in grasses. Dumb-bell shaped guard cells are more advanced in evolutionary terms and more efficient physiologically because guard cells of grasses require fewer solutes and less water to achieve a given unit increase in aperture.
Q8. Auxin was isolated from tips of coloeptile of oat seedlings by
Answer : Option A
Explaination / Solution:
Auxin was first collected by F.W. Went (1928) from coleoptile tip of Avena. He also developed Avena curvature test for bioassay of auxin.
Q9. Hydra reproduce asexually by
Answer : Option D
Explaination / Solution:
In Hydra small outgrowth develops at the bottom side which grows into a bud. The well-developed buds detach from the parent body as new individual.
Q10. The absorption of water by seeds and drywood takes place by a special type of diffusion called
Answer : Option A
Explaination / Solution:
Imbibition is a special type of diffusion when water is absorbed by solids-colloids causing an enormous increase in volume. Examples include the absorption of water by seeds and dry wood.
