Agriculture - Online Test
Q1. Which meristem contributes to the formation of the primary plant body?
Answer : Option A
Explaination / Solution:
Both apical meristems and intercalary meristems are primary meristems because they appear early in life of a plant and contribute to the formation of the primary plant body.
Q2. The process of despecialisation of differentiated cells so that they become undifferentiated and meristematic is called
Answer : Option C
Explaination / Solution:
The process of de-specialisation of differentiated cells so that they become undifferentiated and able to divide is known as dedifferentiation. It involves activation of certain genes which not only reverse differentiation but also stimulate cell division.
Cork cambium, wound cambium and inter-fascicular vascular cambium are always produced through dedifferentiation.
Q3. Some carrier proteins allow diffusion by both molecules cross the membrane in the same direction is
Answer : Option B
Explaination / Solution:
Some carrier or transport proteins allow diffusion only if two types of molecules move together. In a symport, both molecules cross the membrane in the same direction.
Q4. The ion which activates many enzymes involved in photosynthesis,respiration, nitrogen metabolism is
Answer : Option D
Explaination / Solution:
It is absorbed in the form of manganous ions (Mn2+). It activates many enzymes involved in photosynthesis, respiration and nitrogen metabolism.
Q5. An algae having ribbon shaped chloroplast is
Answer : Option C
Explaination / Solution:
The shape of a chloroplast varies from species to species. It may be cup-shaped (e.g., Chlamydomonas), (e.g., Vaucheria), Girdle (e.g., Ulothrix), Stellate or Star-shaped (e.g., Zygnema), Reticulate or net-like (e.g., Cladophora, Oedogonium), Spiral or ribbon or scalariform (e.g., Spirogyra), ovoid or disc or spheroid in higher plants
Q6. The site in chloroplast which is responsible for trapping for light energy is
Answer : Option C
Explaination / Solution:
The grana is responsible for trapping the light energy and converting it into ATP and NADPH during light reaction of photosynthesis.
Q7. The flower which possesses both androecium and gynoecium is called perfect or:-
Answer : Option D
Explaination / Solution:
Bisexual flower conation both male and female reproductive parts i.e. sepals and petals. These flowers are also called as monoecious or hermaphrodite.
Q8. Genotype is the
Answer : Option A
Explaination / Solution:
Genotype is the genetic combination of an individual. TT and Tt are genotypically different but phenotypically appear tall.
Q9. Respiration is
Answer : Option B
Explaination / Solution:
Catabolism is process of break down of any large substance into smaller ones. In respiration, glucose is broken down into carbon dioxide and water molecules. Thus it is referred to as a catabolic reaction
Q10. Some scientist consider virus as living entities because they can
Answer : Option D
Explaination / Solution:
Virus is called as borderline of living and non-living. Viruses act as living one when inside the other living organism and reproduce very fast. When outside the living body, virus behaves as molecules without any sign of living.
