Which of the following statements is true of yeast?

Which of the following statements true of date plam?

Milky water of tender coconut is

Which among the following has 23 chromosomes?

Ina normal pregnant woman, the amount of total gonadotropin activity was assessed. the result expected was

The test-tube baby programme employs which one of the following techniques

Temin and Baltimore are associated with the discovery of

The haploid content of human DNA is

Saccharomyces cerevisiae is used for production of

Which of the following is an abiotic component of the ecosystem?

Given the name of the hormone which is secreted by corpus luteum.

By what Latin name, is the first human-like being, the hominid known?

Name the ancestor of Bryophytes.

Give two examples of disease caused by protozoans.

Write the most important characteristic that aspergillus niger, Clostridium acetobutylicum and Lactobacillus share?

What is the meaning of the term vehicle in genetic engineering ?

What are omnivores?

Unicellular organisms are immortal, whereas multicellular organisms are not.  Justify.

Name one example for each of the following :
A plant in which separate male and female flowers are borne on the same individual at different positions.

Define ovulation.When does it occur?

Placenta acts as an endocrine tissue. Justify.

List two primary factors for the increase in human population.

Thalassemia \(\alpha\) is different from thalassemia \(\beta\).  Justify.

Mention the two assumptions that led to HGP

Who proposed the biogenetic law? Who disapproved it? Why?

What is a deme?

Many microbial pathogens enter the gut of humans along with food.What are the preventive barriers to protect the body from such pathogens?What type of immunity do you observe in this case?

Name the various groups of viruses which act as carcinogenic factors.

Name any four crop plants pollinated by honeybee.

What is the difference between cloning and expression vectors?

What are genetically modified organisms? Name two factors on which their behaviour depends.

There is greater biodiversity in tropical/subtropical regions than in temperate region.Explain.

Give a brief account of loss of biodiversity at global level.

Give the ill effect of benzpyrene. Mention its sources also.

Mention how e-waste is produced and disposed off. Write the solution for its treatment.

Write main kinds of pollutants.

What factors increased the hunting of animals?

Why do we refer to offspring, formed by asexual method of reproduction as clones?

Which one is advance- external fertilization or internal fertilization? Give reasons in support of your answer.

Name the three parts of pistil and mention one function of each of them.

Which one of the following is responsible for nourishment to the developing embryo?Answer giving reasons.

(a) Read the graph given above and correlate the uterine events that take place according to the hormonal levels on
(i) 6-15 days
(ii) 16-25 days 
(iii) 26-28 days(if the ovum is not fertilized)
(b) Specify the sources of the hormones mentioned in the graph.

Mention any six reproduction-related problems/issues.

(a) Some men have abnormally low sperm count in seminal fluid. Also, some women cannot normally conceive because of any of the following reasons:
(i) They cannot produce ova,
(ii) They have blocked oviducts, or
(iii) They have spermicidal secretions in the vagina.
In such couples, one technique is commonly used. Name that Assisted Reproduction Technique.
(b) At what stage, fertilized egg is transferred into the fallopian tube or uterus of the mother in this technique?

It is not possible to study the inheritance of traits in humans, the same way as in peas.  Give two main reasons for it and name the alternative method employed for such a study.

In a cross between a tall pea plant with yellow seeds (DdYy) and plant with green seeds (DdYy), what proportion of the offsprings could be expected to be:
(a) Tall and green;  
(b) dwarf and green?

Write short notes on RNA polymerases of eukaryotic cells.

Discuss the importance of artificial selection in the derivation of the concept of natural selection.

How can diseases be broadly classified?Differentiate between them.

Describe any three reproductive strategies that organisms have evolved in relation to a particular set of selective pressures.

How does an algal bloom cause eutrophication of a water body? Name the weed that can grow in such a eutrophiclake.

(a) Mention those red list categories which together are referred to as 'threatened species'.
(b) What are rare species? Are these endangered or vulnerable at present? Give any one example of rare species in India.