The type of endosperm noticed in Hydrilla seed is ___________

(a)

Ruminate endosperm

(b)

Nuclear endosperm

(c)

Cellular endosperm

(d)

Helobial endosperm

Select the wrong statement(s) regarding cross-pollination.
(a) Pollination depends on external agent and so it is certain.
(b) New varieties are produced.
(c) Continuous cross-pollination leads to weaker progeny.
(d) Germination capacity is highly declined.

(a)

a and d

(b)

b and c

(c)

a, band d

(d)

a, c and d

Generally, the pollen grains are liberated from another at ___________

(a)

2-celled stage

(b)

4-celled stage

(c)

6-celled stage

(d)

8-celled stage

Assertion (A): Entomophily is the most common type of pollination.
Reason (R): Birds and animals bring out effective pollination.

(a)

Both A and R are incorrect.

(b)

A is correct R is incorrect.

(c)

R explains A.

(d)

Both A and R are correct. R is not a correct explanation for A.

Identify the incorrect statement regarding vegetative reproduction.

(a)

Only one parent is required for propagation.

(b)

New individuals are genetically dissimilar.

(c)

Easy mode of reproduction

(d)

Variation does not exist.

Identify the mismatched pair:
(i) Sucker - Chrysanthemum
(ii) Bulbils - Agave
(iii) Stolon - Fragaria
(iv) Runner - Lilium

(a)

i only

(b)

ii only

(c)

iii only

(d)

iv only

Assertion (A): Zea mays is a monocotyledonous plant.
Reason (R): Shield shaped cotyledon is called scutellum.

(a)

A is correct R is incorrect.

(b)

R explains A.

(c)

Both A and R are incorrect.

(d)

Both A and R are correct. R does not explain A.

Observe the diagram and select the correct option mentioning the parts A, B, C and D

(a)

A	B	C	D
Radicle	Cotyledon	Testa	Plumule

(b)

A	B	C	D
Plumule	Cotyledon	Testa	Radicle

(c)

A	B	C	D
Cotyledon	Testa	Plumule	Radicle

(d)

A	B	C	D
Plumule	Radicle	Testa	Cotyledon

Gregor Mendel ___________
(i) was born in Czechoslovakia
(ii) did his experiments in Pisum fulvum
(iii) was the first systemic researcher in genetics
(iv) Published his results in the paper "Experiments on Plant Hybrids"

(a)

All are correct

(b)

(ii), (iii), (iv) are correct

(c)

(i), (iii),(iv) are correct

(d)

(i), (iii), (iv) are correct

In case of co-dominance, monohybrid F ₁ __________ is 1: 2: 1

(a)

Genotype ratio

(b)

Phenotype ratio

(c)

Both genotype & Phenotype ratio

(d)

Ratio is wrong

According to Mendel which character shown dominance

(a)

Yellow flower color

(b)

Yellow cotyledon color

(c)

Wrinkled seeds

(d)

Inflated pod

Which is not a feature of the chromosomal theory of inheritance?

(a)

Somatic cells of organisms are derived from zygote by repeated meiosis.

(b)

Chromosomes retain their structural uniqueness throughout the life of an organism.

(c)

Mendelian factors are located in chromosomes

(d)

Sutton and Boveri independently proposed the theory.

Incomplete linkage was reported by Hutchinson in ___________

(a)

Drosophila

(b)

Maize

(c)

Neurospora

(d)

Lathyrus odoratus

During cross over, chiasma occurs between

(a)

Sister chromatids of non-homologous chromosomes

(b)

Non-sister chromatids of non- homologous chromosomes

(c)

Non-sister chromatids of homologous chromosomes

(d)

Sister chromatids of homologous chromosomes

Identify the mutant variety of castor.

(a)

Sharbathi Sonora variety

(b)

Aruna variety

(c)

Reimei variety

(d)

Erectiferm variety

Statement 1: Pairing of homologous chromosome is called as syndesis.
Statement 2: Proterminal synapsis occurs from telomeres.

(a)

Statement 1 is correct and Statement 2 is incorrect

(b)

Statement 1 is incorrect and Statement 2 is correct

(c)

Both the statements are correct

(d)

Both the statements are incorrect

Statement 1: Self-sterility in Nicotiana is controlled by multiple alleles.
Statement 2: Multiple alleles are always responsible for the same character.

(a)

Statement 1 is correct and Statement 2 is incorrect

(b)

Statement 1 is incorrect and Statement 2 is correct

(c)

Both the statements are correct

(d)

Both the statements are incorrect

Assertion (A): Self-sterility is observed in Nicotiana species.
Reason (R): Because the genes are located on chromosome.

(a)

A is true R is false

(b)

Both A and R are false

(c)

A is true, R is not correct explanation for A

(d)

R explains A

Observe the diagram and name A and B.

(a)

A - Plasmid B - Vector

(b)

A - Nucleoid - B - Plasmid

(c)

A - Bacterial chromosome B - Vector

(d)

A - Nucleoid - B - x phage DNA

The optimal pH of culture medium is generally ___________.

(a)

Acidic

(b)

Basic

(c)

Neutral

(d)

Slightly basic

Which is irrelevant to the first law of thermodynamics?

(a)

Energy can be transmitted from one system to other in many forms.

(b)

Energy transformation results in reduction of free energy.

(c)

Energy can neither be created nor destroyed.

(d)

Energy in the universe is constant.

Identify the correct sequence of various zones from surface to depth in a pond ecosystem.

(a)

Profundal, limnetic, littoral and benthic

(b)

Benthic, littoral, profundal and limnetic

(c)

Limnetic, profundal, littoral and benthic

(d)

Littoral, limnetic, profundal and benthic

Total number of forestry extension centres in Tamil Nadu is ______________

(a)

16

(b)

32

(c)

18

(d)

51

EIA stands for ________________

(a)

Ecological Information Analysis

(b)

Environmental Information Assessment

(c)

Environmental Impact Analysis

(d)

Environmental Impact Assessment

Which is not a free-living nitrogen-fixing species?

(a)

Azotobacter

(b)

Clostridium

(c)

Nostoc

(d)

Anabaena