Practice Questions

TLS Online TPP Program

#Question id: 7227

The regulative ability of the limb bud has recently been highlighted by a remarkable experiment of nature. In numerous ponds in the United States, multilegged frogs and salamanders have been found. The presence of these extra appendages has been linked to the infestation of the larval abdomen by parasitic trematode worms. The eggs of these worms apparently split the developing tadpole limb buds in several places, and the limb bud fragments develop as multiple limbs. This shows:

A. The limb field represents a harmonious equipotent system.

B. The limb field do not represents harmonious equipotential system because different types of genes express during proximal to distal growth.

C. The limb field represents coupled system wherein one gene maintain the expression of other genes.

D. The limb field represents a harmonious equipotent system because only Hox genes expresses all along the limb axis.

E. The limb field represents cells of the limb region can be instructed to form any part of the limb.

Which of the following statements are correct?

#Unit 5. Developmental Biology

A, D and E
B and C
A and E
A only

More Questions

TLS Online TPP Program

#Question id: 12527

#Unit 6. System Physiology – Plant

Which of the following is the incorrect prediction about ABA translocation in vascular tissue by both the xylem and the phloem?

TLS Online TPP Program

#Question id: 12528

#Unit 6. System Physiology – Plant

According to a recent model, the balance between the activities of ABA and gibberellin in seeds is under both developmental and environmental control such as

a) early stages of seed development, ABA sensitivity is high and gibberellin sensitivity is low, which favors dormancy over germination

b) Later in seed development, ABA sensitivity declines and gibberellin sensitivity increases, favoring germination.

c) Environmental factors such as temperature and light affect the ABA:GA ratios by activation of the NCED and GA2ox enzyme, which promotes seed dormancy

d) During an Ambient environment, activation of GA3ox and CYP707A2 inducing dormancy

Which of the following combination from the above statements is incorrect?

TLS Online TPP Program

#Question id: 12529

#Unit 6. System Physiology – Plant

During the mid- to late stages of seed development, specific mRNAs accumulate in embryos, These mRNAs encode so-called late-embryogenesis-abundant (LEA) proteins thought to be involved in desiccation tolerance. This mRNA accumulation in embryo at the time of high levels of which endogenous hormone?

TLS Online TPP Program

#Question id: 12530

#Unit 6. System Physiology – Plant

Some given hormones is also called a ubiquitous hormone?

c) Abscisic acid

d) Brassinosteroids

TLS Online TPP Program

#Question id: 12531

#Unit 6. System Physiology – Plant

The most bioactive brassin in eudicots, which is a polyhydroxylated steroid similar to animal steroid hormones that brassin is

TLS Online TPP Program

#Question id: 12532

#Unit 6. System Physiology – Plant

In Arabidopsis some brassinosteroid mutants given below;

a) 3-week-old light-grown homozygous bri1 mutant shown a severe dwarf plant while heterozygous bri1 mutant exhibits wild-type morphology

b) 3-week-old light-grown homozygous cpd (constitutive photomorphogenisis and dwarfism) mutant exhibits a wild-type phenotype while heterozygous mutant shown a dwarf phenotype

c) The dark-grown det2 mutant has short, thick hypocotyls and expanded cotyledons while the dark-grown wild type has long, thin hypocotyl

d) The dark-grown det2 mutant has exhibits a wild-type phenotype

Which of the following given mutants of brassinosteroid is correct?