Biology - Online Test
Q1. The major approach towards the crop improvement programme is
Answer : Option C
Explaination / Solution:
Crop improvement programme is carried out to obtain crops with desired traits that may be more yields, resistance to disease, higher nutrient value etc. Two plants having desired traits are hybridized to obtain combination of desired traits.
Q2. The birth rate if 7 new plants are added to previous year plant population of 23 Salvinia plants will be
Answer : Option B
Explaination / Solution:
The birth rate of a population =
Here birth rate=
Hence, birth rate of Salvinia plants is equal to 0.3.
Q3. Non-symbiotic nitrogen fixing prokaryote is
Answer : Option C
Explaination / Solution:
Most of the prokaryotic nitrogen fixing prokaryotes are symbiotic in nature. Azatobacter is a bacteria which is non-symbiotic nitrogen fixing prokaryote.
Q4. Select which one is correctly matched pair :
Answer : Option C
Explaination / Solution:
Some of the substances like fructose and some amino acids are absorbed with the help of the carrier ions like sodium ions. This mechanism is called the facilitated transport.
Q5. Which plant is responsible for doing hallucination?
Answer : Option C
Explaination / Solution:
Hallucination is a condition in which a person feels pleasure in spite of stress and other mental problems. In this condition, central nervous systems get influenced and reduce the thinking capacity. Datura, Atropa baladona and erythroxylum coca, all cause hallucination.
Q6. Match the following :
column A
a) Hypophysis
b) Modulator
c) Receptor
d) Effector
column B
i) Sense organs
ii) Pituitary
iii)Brain and spinal cord
iv) Muscles and glands
column A
a) Hypophysis
b) Modulator
c) Receptor
d) Effector
column B
i) Sense organs
ii) Pituitary
iii)Brain and spinal cord
iv) Muscles and glands
Answer : Option D
Explaination / Solution:
Hypophysis is a part of pituitary gland. Modulator is present in brain and spinal cord. Receptor is located in sense organs. Effectors are muscle and glands that bring about movement.
Q7.
Identify the plant shown in the figure given below.
Answer : Option D
Explaination / Solution:
The plant shown above is cycas. This plant belongs to division Cycadophyta and family Cycadaceae. It is dioecious and Cycas circinalis species is endemic to India.
Q8. Chlorophyll is located inside
Answer : Option D
Explaination / Solution:
The chloroplast consists of a number of organised flattened membranous sacs called the thylakoids,Chlorophyll pigments are present in the thylakoids.
Q9. Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it?
Answer : Option D
Explaination / Solution:
Lysine, encoded by the codons AAA and AAG, is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group, an α-carboxylic acid group, and a side chain lysyl, classifying it as a charged, aliphatic amino acid.
UUA, AUG and CCC do not code for Valine, cysteine and alanine respectively.
Q10. Which of the following stages of calvin cycle are in correct order?
Answer : Option B
Explaination / Solution:
The Calvin cycle can be described under three stages: carboxylation, reduction and regeneration.Pathway operated in cyclic manner.
