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In a dihybrid cross AABB $\times$ aabb, $F_2$ progency of AABB, AABb, AaBB and AaBb accurs in ratio of________

The heavy drinkers are often dehydrated due to :

How many bones are there in appendicular skeleton?

Match the following (with respect to edible part):

(a) Apple (i) Thalamus

(b) Tomato (ii) Pericarp and placenta

(c) Banana (iii)Mesocarp and endocarp

(d) Mango (iv) Mesocarp

Movement is not regulated by sphincter or valve during

The muscles with striations found attached to bones, which helps in voluntary movements of the body are_____.

Choose the correct order in which egg travels from the ovary to the uterus.

Process by which food substances are moved to rest of the plant by phloem is known as

Which one of the following statements is incorrect regarding IUDs?

Two different species cannot live for a long duration in the same niche or habitat. This law is :

Match the following:

Match List–I with List–II and select the correct answer using the codes given below the lists

$\begin{array}{cc}ListI& ListII\\ A.A.Theamountofenergyaccumulationin& 1.Grossprimaryproductivity.\\ greenplantsthroughtheprocessof& \\ photosynthesis& \\ & \\ B.Thetotalorganicmattersynthesizedby& 2.Primaryproductivity\\ theproducersintheprocessofphotosynthes& \\ isperunittimeandarea.& \\ & \\ C.Rateofstorageoforganicmatter& 3.Secondaryproductivity\\ inplanttissuesinexcessoftherespiratory& \\ utilizationduringthemeasurementperiod& \\ & \\ D.Rateofenergystorageatconsumerlevel& 4.Netprimaryproductivity\end{array}$

Of the total amount of energy that passes from one trophic level to another in a food chain, about $10\%$ is

The embryonic period finishes at the end of -

Small pox and rabies are caused by

The enlargement of prostate occludes the

A biochemical process in plants by which meristematic cells undergo changes and transform into permanent cells is

Flightless bird is:

Match the following:

The model organism that T.H. Morgan used in his genetic studies was

Regarding assertion and reason, select the right option.

Assertion [A]: Charge of DNA molecule is negative.

Reason [R]: Histone proteins associated with DNA are positively charged.

Typhoid is caused by

Which of the following has obliterated central lumen?

Tentacles of Hydra help in:

How many carbon atoms are in a molecule of RuBP?

This graph is a typical cell cycle representing DNA content of various phases (1 to 4). Identify the phases based on changes in the DNA content and select the correct option.

Arrange the following events of spermatogenesis:

i. The spermatogonia give rise to 4 primary spermatocytes (2n)

ii. The spermatogonia divide mitotically to maintain the germ cells (2n)

iii. Spermiogenesis

iv. Each primary spermatocyte gives rise to 2 secondary spermatocytes (n)

The failure of chromosomes to separate during cell division is known as:

Consumer Protists are classified into four groups based on

The gene I that determines ABO blood groups has three alleles $I^A,I^{B}and{I}^O$ . The correct sequence of dominance of these alleles is

Which of the following cranial nerves is both sensory and motor in nature?

Viruses are

Identify the following chondrichthyes fishes.

Some desert beetles can survive on “metabolic water” without ever drinking liquid water. This metabolic water is

Mule is produced by:

Identify the mismatch in the following pairs

Number of gill slits in cyclostomes is

Loose connective tissue that serves as a support framework of epithelium is:

Which one is correctly matched?

Match the following sphincters of with their respective location.

$\begin{array}{cc}ColumnI\left(Sphincters\right)& ColumnII\left(Location\right)\\ i.\text{Ileo-cecal Sphincter}& a.\text{anus}.\\ ii.\text{Anal Sphincter}& b.\text{between ileum and Caecum.}\\ iii.\text{Pyloric Sphincter}& c.\text{between stomach and small intestine.}\\ iv.\text{Lower Esophageal Sphincter}& d.\text{between Esophagus and Stomach.}\end{array}$