Select the correct statements from the following regarding asexual reproduction.
I. It is slower than sexual reproduction.
II. It involve a single parent.
III. It produces progeny that are genetically identical with the parent.
IV. Clones are the progeny of asexual reproduction
I, II, III, IV
I, II, IV
I, II, III
II, III, IV
Sushi is a highly prized delicacy prepared from the flesh of Japanese puffer fish.
But recently it is found to pose health risk to humans because.
tetrodotoxin (TTX) in its gonads block Na+ channels on axons
- bungarotoxin from the fish block acetylcholine receptors
toxins in its body block different types of voltage gated by Ca2+ channels
None of the above
Given below are the set of statements describing the structural details of Purines (A) and Pyrimidines (BJ.
I. Nine - membered, double ring
II. Six - membered, single ring
III. Contains Nitrogen atoms at four positions
IV. Contains Nitrogen atoms at two positions
Segregate the statements I - IV into categories A and B and choose the correct option.
A | B |
I, IV | II, III |
Only I | Only IV |
Only II | Only I |
I, III | II, IV |
D.
I, III | II, IV |
Purine is a heterocyclic aromatic organic compound that consists of a pyrimidine ring fused to an imidazole ring. It is nine membered, double ring and contains Nitrogen atoms at four positions.
Pyrimidine is a simple aromatic ring composed of two nitrogen atoms and four carbon atoms, with hydrogen atoms attached to each carbon.
Parapatric speciation takes place when
a small segment of the original population becomes isolated reproductively
a part of the population becomes geographically isolated from the main population
a very different daughter species bud off from a semi- isolated peripheral population of ancestral species
a population of a species enters a new habitat
Match the following columns and choose the correct option from the codes given below.
Column I (Cytokine) | Column II (Function) |
A. Gamma infection (- IFN) | 1. Stimulates TH cells in the presence of antigens |
B. Interlukin 1 (IL- 1) | 2. Cytotoxic to tumour cells |
C. Interlukin 2 (IL- 2) | 3. Increase macrophage activity against tumour cells |
D. Tumour necrosis factors beta (TNF- ) | 4. Involved in the proliferation of antigen- stimulated TH cells |
A - 1; B - 4; C - 3; D - 2
A - 4; B - 3; C - 2; D - 1
A - 3; B - 1; C - 4; D - 2
A - 2; B - 3; C - 1; D - 4
Match the following columns and choose the correct option from the codes given below.
Column I (Terminology related to corals) | Column II (Explanation) |
A. Corallite | 1. Main constitutent of coral reef |
B. Corallium | 2. Central irregular skeleton mass of ridge |
C. Hexacoralliaons | 3. Skeleton of mass solitary coral |
D. Columella | 4. Skeleton of colonical coral |
A - 1; B - 3; C - 2; D - 4
A - 2; B - 1; C - 4; D - 3
A - 3; B - 4; C - 1; D - 2
A - 4; B - 2; C - 3; D - 1
Study the following Columns.
Column I | Column II |
A. Hydrogen bond | 1. Adenine - Deoxyribose |
B. N - glycosidic linkage | 2. Glucose - Fructose |
C. Phosphodiester bond | 3. Leucine - Glycine |
D. Peptide bond |
4. Nucleotide - Nucleotide in polynucleotide chain 5. Guanine cytosine on opposite strands of DNA. |
The correct match is
A - 5; B - 1; C - 4; D - 3
A - 2; B - 1; C - 5; D - 3
A - 5; B - 3; C - 4; D - 2
A - 1; B - 4; C - 5; D - 2
Identify the correct pair of statements.
I. White kernal of coconut is a free nuclear endosperm.
II. In dioecious plants, autogamy is prevented but geitonogamy occurs.
III. Cleistogamous flowers are always selfpollinated.
IV. Castor is an endospermic seed.
II, IV
II, III
I, II
III, IV