Agriculture - Online Test

Q1. How many cells per hour does a single maize root apical meristem can give?
Answer : Option C
Explaination / Solution:

Growth is measured by a variety of parameters some of which are: increase in fresh weight, dry weight,length, area, volume and cell number. one single maize root apical mersitem can give rise to more than17,500 new cells per hour, whereas cells in a watermelon may increase in size by upto 3,50,000 times. In the former, growth is expressed as increase in cell number; the latter expresses growth as increase in size of the cell.

Q2. Root hairs absorb water from soil with the help of
Answer : Option C
Explaination / Solution:

Root hairs absorb water from soil with the help of suction pressure created due to concentration difference of water and mineral ions present in soil.

Q3. Which is an important constituent of protein involved in transfer of electrons?
Answer : Option D
Explaination / Solution:

Plants obtain iron in the form of ferric ions (Fe3+). It is required in larger amounts in comparison to other micronutrients. It is an important constituent of proteins involved in the transfer of electrons like ferredoxin.

Q4. Kelps are
Answer : Option D
Explaination / Solution:

Kelps are marine algae of class phaeophyceae or brown algae. The body of kelp may reach upto 100 meter long. They vary in colour from olive green to various shades of brown depending upon xanthophyll pigments , fucoxanthin present in them.

Q5. The essential role of air in the growth of green plants is given by
Answer : Option A
Explaination / Solution:

Joseph Priestley (1733-1804) in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants.

Q6. In some plants anther and stigma mature at same time this condition is called


Answer : Option D
Explaination / Solution:

Homogamy – In this case the anther and stigmas of a bisexual flower mature simultaneously. The pollen grains reach the mature stigma either by contact, wind, gravity, rain drop or even insects. Self pollination brought about by contact is called direct autogamy and remaining agencies perform indirect autogamy.

Q7. Monohybrid ratio is
Answer : Option D
Explaination / Solution:

Monohybrid ratio is the ratio of different phenotypic traits obtained on hybridizing single pair of trait. It is 3:1. When tall pea plant is crossed with dwarf, the offspring obtained are in 3/4 tall and 1/4 dwarf.

Q8. In plants, the gaseous exchange take place in a) Stomata b) Roots c) Stems d) Lenticles
Answer : Option B
Explaination / Solution:

Plants unlike animals have no special systems for breathing or gaseous exchange. Stomata and lenticels allow gaseous exchange by diffusion.

Q9. The period of pregnancy is known as
Answer : Option B
Explaination / Solution:

The duration from implantation of fertilised eggs to uterus till birth of well-developed baby is called gestation period. It is about nine months in human beings.

Q10. The root is covered at the apex by a thimble-like structure called
Answer : Option A
Explaination / Solution:

The root is covered at the apex by a thimble-like structure called the root cap.