GATE Life Science Mock Test- 4 (Botany & Zoology) - GATE Life Sciences MCQ

The word 'compared' conveys that both the fillers should be in contrast to each other. 'Lukewarm ' means 'unenthusiastic', and 'electrify' means 'cause a sudden sense of thrilling excitement'. Option 2 is the correct answer.
'Milder' needs comparative word 'than'. The words in 3 are not contrasting but of different context; hence unfit. 'Unusual' in 4 also does not fit in the context with the other blank word.

'Repeal' means 'revoking or annul (a law or act of parliament)'. So, its synonyms are 'revoke, rescind and invalidate'. Option 4 is correct.

Given relation p(t) = 1000 + 1000 t/(100 + t²)
Differentiating with respect to t
p'(t) = 1000[{(100 + t²) × 1 - t(0 + 2t)}/(100 + t²)2]
Put p'(t) = 0
1000[{(100 + t²) × 1 - t(0 + 2t)}/(100 + t²)²] = 0
100 + t² - 2t² = 0
t² = 100
t = 10
As  It means t = 10 is the point of local maxima.
Hence,
Maximum size of this bacterial population = 1000 + (1000 × 10)/(100 + 100) = 1050

Fe³⁺: 1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵. As we see 3d orbital is exactly half filled, so all the five electrons in 3d orbital are unpaired. Greater the number of unpaired electrons, greater is the magnetic moment.

The carbonyl carbon being sp²-hybridised has a planar arrangement of three  bonds and the nucleophile (here CN^-) can attack from both sides.
Hence, the product formed is a 50% - 50% mixture of both enantiomers i.e., a racemic mixture is obtained.
Therefore, 50% molecules (lactic acid) will have the D-configuration and 50% will have the L-configuration.

Ammonia is a base. In acidic medium, it reacts with protons to form ammonium ions. Thus, free ammonia molecules are not present. So they cannot coordinate with Cu(II) ion to form the [Cu(NH₃)₄]²⁺ complex ion.

Tundra biome becomes little precipitation but at the time of short summer season, it is extremely moist with several swampy regions, ponds and bogs as water cannot absorb into the chilled ground. Tundra's ecology is regulated by cold climate and northern latitude. Long day length which follows short summer is a benefit to plants, which are capable of photosynthesising 24 hours a day in few places. It causes fast plant development.

Inner membrane of mitochondria possesses characteristic particles on its inner surface. These particles are known as Fernandez moran subunits or oxysomes. Each oxysome has a flat base, a globular head and a small stack (F2-F6 subunit). The base is buried into the inner membrane, while the head and stalk extend into the matrix.

Aposporously formed gametophyte is usually diploid. Its diploid gametes bring about polyploidy and hence, development of new species. In seed plants, diploid nuclear cells give rise to diploid female gametophytes aposporously.

One ATP yields about 34 KJ energy. The total energy obtained from 38 ATP molecule is 1292 KJ. The glucose molecules store energy of about 2870 KJ.
Efficiency: 1292/2870 × 100 = 45%

Community itself modifies its own environment and thus, causing its own replacement by new community.

During carbon dioxide fixation in C₃ plants, only granal type of chloroplasts are involved.

Datura stramonium is the plant of solanaceae family. It has medicinal importance here the leaves are exstipulate, alternate, entire, lobed and reticulate venetion.
The flowers are ebracteate, bisexual, pentamerous, actinomorphic and hypogynous.

Narrow green and yellow normal pods are parental type. After crossing these two, all F1 progenies are normal green pod type. Then, F1 is test crossed with homozygous recessive parent. This cross results in 11 narrow yellow and 9 normal green pods.
These are recombinant type. So, recombination frequency will be
= (number of recombinants / total number of offsprings) × 100
=[(11+9)/(144+150+11+9)] ×100
=(20/314) ×100=0.064×100=6.4%
We know that map distance between two genes = recombination frequency between those two genes
Therefore, distance between 2 genes = 6.4 mu.

It is found in human caecum, colon or vermiform appendix

The variation in molecular weight of 2 polypeptides is because of loss of a 4 kDa peptide from N-terminus.

Lymphatic filariasis is caused by infection with parasites classified as nematodes (roundworms) of the family Filariodidea. There are 3 types of these thread-like filarial worms: Wuchereria bancrofti, which is responsible for 90% of the cases. Brugia malayi, which causes most of the remainder of the cases.

Hypercholesterolemia is a condition whereby an increased cholesterol in blood is caused due to high amount of fat in diet for a prolonged period. It leads to thickening and hardening of arterial wall, which in turn causes narrowing of arteries and thereby blood pressure is increased.

For precipitation to take place, both antigen and antibody should be multivalent. It is a false statement.

Toll-like-receptors (TLRs) play the essential role in the immune defense by identifying Microbial components. TLRs are the group of proteins which play the key role in innate immune system and also the digestive system.