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The arrangement of ovules within the ovary is known as placentation.What does the term placenta refer to? Name and draw various types of placentations in the flower as seen in T.S. or V.S.

Amino acid methionine is the precusor for

The term 'polyadelphous' is related to

Outline the steps involved in attaining sustainable development in India.

In the DNA molecule

When synapsis is complete all along the chromosome, the cell is said to have entered a stage called

If the vapour pressure of pure solvent A is 17.5 mm and lowering of vapour pressure of solution formed by adding a non-volatile electrolyte is 0.0175 mm then what is the relative lowering of vapour pressure?

A single maize root apical meristem can give rise to more than 17,500 new cells per hour, while cells in a water melon may increases in size by upto 350,000 times. In the former and latter, growth is expressed respectively as an increase in cell ___________.

What type of process is photosynthesis?

The unit of permittivity of free space is

Arteries differ from veins

The layer of actively dividing cells of skin is termed as

How are prosthetic groups different from co-factors ?

The genotype of blood group AB is

Which of the following most accurately explains the cause for the abnormal number of chromosomes during human reproduction that can result in Down's syndrome, Turner's syndrome, or Klinefelter's syndrome?

Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?

Repressor protein is produced by

Sickle-cell anaemia is

ICBN is concerned with

Amino acid are connected to each other by:

Chiasma formation takes place during:

On hydrolysis maltose gives:

Match the following list of animals with their level of organisation.

$\begin{array}{cc}\text{Level of organisation}& \text{Animal}\\ \text{A. Organ level}& \text{1. Pheretima}\\ \text{B. Cellular aggregate level}& \text{2. Fasciola}\\ \text{C. Tissue level}& \text{3. Spongilla}\\ \text{D. Organ System level}& \text{4. Obelia}\end{array}$

In the above cross, the probability of producing $F_2$ homozygous plants with red fruits, heterozygous plants with red fruits, and plants with yellow colored fruits respectively is

What are the age restrictions for marriage by law for boys and girls in India?

In both plants and animals _________ are responsible for the transition between phases of life cycle.

How bone marrow is transplanted?

Ventral mouth is seen in

The market price of the US dollar has increased considerably leading to rise in rupee value of imports of essential goods. What can the RBI do to ease the situation?

In autosomal dominant disorders, just one copy of the gene, or one allele is sufficient to create all the damage and cause the disorder.

Do you think that friends can influence one to take alcohol/ drugs ? If yes, how may one protect himself/ herself from such an influence ?

Why the integuments of an ovule harden and the water content is highly reduced as the seed matures?

What is meant by biodiversity? List two advantages of conserving forest and wild life

The absence of one of the X chromosomes results in

Rearrange the following zones as seen in the root in vertical section and choose the correct option.

A. Root hair zone B. Zone of meristems

C. Root cap zone D. Zone of maturation

E.Zone of elongation

Codes

(a) C, B, E, A, D (b) A, B, C, D, E (c) D, E, A, C, B (d) E, D, C, B, A

A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.

(a) What aspect of photosynthesis was being tested ?

(b) Why was the plant placed in the dark before beginning the experiment ?

(c) During the starch test why was the leaf -

(1) boiled in water (2) boiled in methylated spirit.

(d) Write a balanced chemical equation to represent the process of photosynthesis.

(e) Draw a neat diagram of a chloroplast and label its parts.

Glycosidic linkage present in starch or glycogen generally is

Protonema is

(a) haploid and is found in mosses (b) diploid and is found in liverworts

(c) diploid and is found in pteridophytes (d) haploid and is found in pteridophytes

Describe various forms of lipid with a few examples.

Question 29
Chlorophyll-'a' is the primary pigment for the light reaction. What are accessory pigments? What is their role in photosynthesis?

How is a cancerous cell different from a normal cell ?