Questions
In hydroponic process, the plant is grown in
- water and gravel
- water and soil
- water, nutrients and soil
- water and nutrients, without soil
- None of these
Essential elements according to their requirements are named as
- large nutrients and few nutrients
- macro nutrients and micro nutrients
- useful nutrients and non-useful nutrients
- macro elements and micro elements
- macro elements and nano elements
Which of the following elements activates the osmotic potential of the cell?
- Zinc
- Iron
- Phosphorus
- Potassium
- None of these
If essential elements are below the amount of nutrients required for normal growth and development of plants, plants show certain morphological and observable characters known as deficiency symptoms. What is the term used for the level of nutrients here?
- Deficiency level
- Low level
- Dilute concentration
- Critical concentration
- None of these
If essential elements are below their critical concentration, then which of the following symptoms can be seen in plants?
- Delayed flowering
- Yellowing of leaves
- Death of tissues
- Inhibition of cell division
- All of the above
Toxicity of Mn does not cause deficiency of which of the following elements?
- Mo
- Ca
- Fe
- Mg
- All of the above
In which of the following processes in the nitrogen cycle does the decomposition of organic nitrogen of plants and animals into ammonia take place?
- Nitrogen fixation
- Nitrification
- Ammonification
- Denitrification
- None of these
Which of the following statements is/are true regarding apoplast transport?
- The metabolic state of root directly affects the pathway.
- It is faster
- There is resistance in the movement of water.
- It consists of living parts of the plant body.
- All of the above
Which of the following explains the term 'efflux' during the symplast transport?
- Movement of ions
- Inward movement of ions
- The outward movement of ions
- The movement of ions within the cell
- None of these
Which of the following bacteria carry out the process of denitrification?
a. Pseudomonas
b. Azotobacter
c. Thiobacillus
d. Nostoc
- Only a and b
- Only a and c
- Only c and d
- Only b and d
- Only a and d
The symbiotic biological nitrogen fixing associations like a legume-bacteria relationship is not seen with the species of rod-shaped Rhizobium and the roots of
- alfalfa
- lentils
- garden pea
- clover bean
- None of these
Which of the following is the correct sequence of nodule formation after multiple interactions between Rhizobium and roots of the host plant?
(a) The infected root hair curls.
(b) The nodule establishes a direct vascular connection with the host.
(c) Bacteria gets modified into rod-shaped bacteroids.
(d) Bacteria contacts a susceptible root hair and divide.
- c, a, d, b
- d, a, b, c
- b, a, c, d
- d, a, c, b
- None of these
In reductive animation, which of the following acids reacts with ammonia?
- α-ketoglutaric acid
- Glutamic acid
- Glutaric acid
- α-glutamic acid
- None of these
Which of the following elements is present in a small amount in tissues?
- Fe
- C
- Mg
- K
- S
Phosphorus has an important role in constituting certain structures. Which of the following is/are not among them?
- Cell membrane
- Auxin
- Nucleic acid
- Phospholipids
- None of these