Out of following plants, which one is not browsed by cattle :

Pyramid of energy is always upright because:
1. Energy flows unidirectionally
2. The number of organisms at different trophic levels do not affect energy
3. Some energy is lost when we move from one trophic level below to next trophic level above
4. Energy largely depends on the biomass at the base trophic level

Read the passage carefully and answer the given questions.
Recombinant DNA Technology
Asexual reproduction preserves the genetic information, while sexual reproduction permits variation. Traditional hybridization procedures used in plants and animals breeding very often lead to inclusion and multiplication of undesirable genes along with the desired genes. The techniques of genetic engineering, which include creation of recombinant DNA, use of gene cloning and gene transfer, overcome this limitation and allow us to isolate and introduce only one or a set of desirable genes without introducing genes into the target organism.
What is the purpose of using a gene promoter in recombinant DNA technology?

Which of the following is a hormone releasing IUD?

Which one of the following statements is not correct regarding the DNA?

Identify the practices followed to avoid sexually transmitted infection
A. Avoiding sex with unknown partners/multiple partners
B. Using condom during coitus
C. Periodic Abstinence
D. Insertion of copper-T in the uterus
Choose the correct answer from the option given below:

Arrange the stages of embryo development in a dicot plant.
(A) Heart shaped embryo
(B) Globular embryo
(C) Zygote
(D) Mature embryo
Choose the correct answer from the options given below:

Graphs were plotted between stopping potential \( (V_o) \) and frequency of incident radiation \( (\nu) \) for 2 metals namely Cesium (work fn. 2.14) and Aluminium (work fn. 4.28). The ratio of slope of graph of Cesium to the slope of graph for Aluminium is:

The interaction between two species where one species is benefitted and the other is neither benefitted nor harmed is known as:

Read the following passage carefully and answer the given questions.
The B-lymphocytes produce an army of proteins in response to pathogens. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection. Symptoms of allergic reactions include sneezing, watery eyes, running nose and difficulty in breathing. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Lymphoid organs are the organs where origin and/or maturation and proliferation of lymphocytes occur. The primary lymphoid organs are bone marrow and thymus. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. Heroin commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine, which is extracted from the latex of poppy plant Papaver somniferum.
Heroin, commonly called smack and chemically is -

The function \(f(x)=-\frac{3}{4} x^4-8 x^3-\frac{45}{2} x^2+163\) has a local maxima at

An unpolarised light of intensity \( I_0 \) passes through five identical polarisers arranged in such a manner that the transmission axis of each is set at an angle of 30° with respect to its predecessor. The ratio of the intensity of the final emerging light to that of the unpolarised light is

The projection of the vector \(2 \hat{i}-\hat{j}+3 \hat{k}\) on the vector \(3 \hat{i}+2 \hat{j}+6 \hat{k}\) is :