Find out the incorrect statement about action of hormones: 

(a) Steroid hormones are lipid soluble and pass across the cell membrane easily. 

(b) Synthesis of secondary messengers in the cell is activated by the binding of peptide hormones. 

(c) Receptor-steroid hormone complex binds to DNA causing transcription of genes. 

(d) Production of cAMP in the cell is activated by binding of steroid hormone to receptor.

The sugar glider and flying squirrel belong to two different groups of mammals, but they have both evolved bushy tails and flaps of skin that help them exploit their forest environments more efficiently. This pattern of evolution is an example of: 

(a) character displacement 

(b) adaptive radiation. 

(c) convergent evolution 

(d) divergent evolution

The photosynthetic pigment that provides effective photoprotection is : 

(a) chlorophyll b 

(b) chlorophyll e 

(c) phycobilins 

(d) carotenoids

If a tissue is consuming 50 molecules of O₂ and releasing 70 molecules of CO₂, then the substrate being utilized in cellular respiration is : 

(a) glucose 

(b) fatty acid 

(c) amino acid 

(d) organic acid

A biologist was given two animal cell populations, X and Y. When he subjected them to culturing under similar conditions of availability of nutrients, growth factors and substratum he found the growth of sample X stopped after the available substratum was covered while the growth of sample Y continued so that multilayered mass was formed. The cells in sample X and Y respectively, are most likely to be: 

(a) epithelial cells and leucocytes 

(b) germinal cells and muscle cells 

(c) normal cells and cancer cells 

(d) diploid cells and polyploid cells

Deep sea sponges have silicate spicules because: 

(a) precipitation of calcium carbonate is hindered by the depth. 

(b) at greater depth sequestration of silica is easier. 

(c) only silicious spicules make circulation of water through body efficient. 

(d) availability of calcium is relatively less at depth.

Eastern and Western Meadow Larks look almost the same and inhabit the same areas of Prairie. They recognize mates of their own species by distinctive courtship songs: This is an example of type of pre-zygotic isolation. 

(a) Ecological 

(b) gametic 

(c) mechanical 

(d) behavioural

Four types of chemical messengers (Black Dots) released from the regulator cell (R) to the target cell (T) are depicted in I, II, III and IV

Match I, II, III and IV sequentially with (i) Steroid Hormone, (ii) Pheromones, (iii) Neurohormone iv) Neurotransmitter and choose the correct option. 

(a) iv, iii, ii, i 

(b) iv, iii, i, ii 

(c) i, ii, iii, iv 

(d) iii, iv, i, ii

In the following diagram distribution of 4 species of plants (P, Q, Rand S) along length of a geographical unit has been depicted. Which among them would best represent vegetation across a cliff?

The extracellular fluid in human body contains large amounts of sodium, chloride, bicarbonate ions and other nutrients for the cells. Which of the following can be categorized as extracellular fluid? 

i. Lymph 

ii. Renal interstitial fluid 

iii. Axoplasm 

iv. Cerebrospinal fluid 

(a) i, ii, iii and iv 

(b) i,& iii only 

(c) i, ii and iv only 

(d) i & ii only